1
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Gao M, Lu X, Yang Y, Qin W. Photon-Dipole-Spin Interactions in M(TCNE) x/P(VDF-TrFE) Multiferroic Heterostructure Available for Bimodal Control of Multistate Data-Storage. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2405024. [PMID: 38736201 DOI: 10.1002/adma.202405024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2024] [Revised: 05/09/2024] [Indexed: 05/14/2024]
Abstract
Organic multiferroic heterostructure is one of the most promising structures for the future design of high-density flexible energy-efficient data storage. Here, organic ferromagnetic metal(tetracyanoethylene) (M(TCNE))x/ferroelectric poly(vinylidene fluoride-co-trifluoroethylene) (P(VDF-TrFE)) multiferroic heterostructures are fabricated, where the excited state in M(TCNE)x interacted with localized dipole in P(VDF-TrFE) provides a key link for the interfacial coupling. Thus, aligned dipoles in P(VDF-TrFE) by external electric field can affect the magnetization of Fe(TCNE)x effectively to result in a pronounced magnetization-voltage (M-V) hysteresis loop. Moreover, light-induced electron-hole pairs in Fe(TCNE)x with long lifetime effectively interact with the dipoles in P(VDF-TrFE) to lead to an effect in external light control of electric polarization of P(VDF-TrFE). Overall, the organic multiferroic heterostructure provides the possibility of realizing two storage modes, light control of dipole as well as electric field control of spin, which can broaden multifunctional applications of organic multiferroic materials in the area of multistate storage.
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Affiliation(s)
- Mingsheng Gao
- School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, China
| | - Xiangqian Lu
- School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, China
| | - Yuying Yang
- School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, China
| | - Wei Qin
- School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, China
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2
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Pan Q, Gu ZX, Zhou RJ, Feng ZJ, Xiong YA, Sha TT, You YM, Xiong RG. The past 10 years of molecular ferroelectrics: structures, design, and properties. Chem Soc Rev 2024; 53:5781-5861. [PMID: 38690681 DOI: 10.1039/d3cs00262d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2024]
Abstract
Ferroelectricity, which has diverse important applications such as memory elements, capacitors, and sensors, was first discovered in a molecular compound, Rochelle salt, in 1920 by Valasek. Owing to their superiorities of lightweight, biocompatibility, structural tunability, mechanical flexibility, etc., the past decade has witnessed the renaissance of molecular ferroelectrics as promising complementary materials to commercial inorganic ferroelectrics. Thus, on the 100th anniversary of ferroelectricity, it is an opportune time to look into the future, specifically into how to push the boundaries of material design in molecular ferroelectric systems and finally overcome the hurdles to their commercialization. Herein, we present a comprehensive and accessible review of the appealing development of molecular ferroelectrics over the past 10 years, with an emphasis on their structural diversity, chemical design, exceptional properties, and potential applications. We believe that it will inspire intense, combined research efforts to enrich the family of high-performance molecular ferroelectrics and attract widespread interest from physicists and chemists to better understand the structure-function relationships governing improved applied functional device engineering.
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Affiliation(s)
- Qiang Pan
- Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics, Southeast University, Nanjing 211189, P. R. China.
| | - Zhu-Xiao Gu
- Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics, Southeast University, Nanjing 211189, P. R. China.
- State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing 210008, P. R. China.
| | - Ru-Jie Zhou
- Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics, Southeast University, Nanjing 211189, P. R. China.
| | - Zi-Jie Feng
- Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics, Southeast University, Nanjing 211189, P. R. China.
| | - Yu-An Xiong
- Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics, Southeast University, Nanjing 211189, P. R. China.
| | - Tai-Ting Sha
- Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics, Southeast University, Nanjing 211189, P. R. China.
| | - Yu-Meng You
- Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics, Southeast University, Nanjing 211189, P. R. China.
| | - Ren-Gen Xiong
- Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics, Southeast University, Nanjing 211189, P. R. China.
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3
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Yu LQ, Guo RT, Guo SH, Yan JS, Liu H, Pan WG. Research progress on photocatalytic reduction of CO 2 based on ferroelectric materials. NANOSCALE 2024; 16:1058-1079. [PMID: 38126461 DOI: 10.1039/d3nr05018a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2023]
Abstract
Transforming CO2 into renewable fuels or valuable carbon compounds could be a practical means to tackle the issues of global warming and energy crisis. Photocatalytic CO2 reduction is more energy-efficient and environmentally friendly, and offers a broader range of potential applications than other CO2 conversion techniques. Ferroelectric materials, which belong to a class of materials with switchable polarization, are attractive candidates as catalysts due to their distinctive and substantial impact on surface physical and chemical characteristics. This review provides a concise overview of the fundamental principles underlying photocatalysis and the mechanism involved in CO2 reduction. Additionally, the composition and properties of ferroelectric materials are introduced. This review expands on the research progress in using ferroelectric materials for photocatalytic reduction of CO2 from three perspectives: directly as a catalyst, by modification, and construction of heterojunctions. Finally, the future potential of ferroelectric materials for photocatalytic CO2 reduction is presented. This review may be a valuable guide for creating reasonable and more effective photocatalysts based on ferroelectric materials.
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Affiliation(s)
- Ling-Qi Yu
- College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, People's Republic of China.
| | - Rui-Tang Guo
- College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, People's Republic of China.
- Shanghai Non-Carbon Energy Conversion and Utilization Institute, Shanghai 200090, People's Republic of China
| | - Sheng-Hui Guo
- College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, People's Republic of China.
| | - Ji-Song Yan
- College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, People's Republic of China.
| | - Hao Liu
- College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, People's Republic of China.
| | - Wei-Guo Pan
- College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, People's Republic of China.
- Shanghai Non-Carbon Energy Conversion and Utilization Institute, Shanghai 200090, People's Republic of China
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4
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Su SQ, Wu SQ, Kanegawa S, Yamamoto K, Sato O. Control of electronic polarization via charge ordering and electron transfer: electronic ferroelectrics and electronic pyroelectrics. Chem Sci 2023; 14:10631-10643. [PMID: 37829034 PMCID: PMC10566498 DOI: 10.1039/d3sc03432a] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Accepted: 08/31/2023] [Indexed: 10/14/2023] Open
Abstract
Ferroelectric, pyroelectric, and piezoelectric compounds whose electric polarization properties can be controlled by external stimuli such as electric field, temperature, and pressure have various applications, including ferroelectric memory materials, sensors, and thermal energy-conversion devices. Numerous polarization switching compounds, particularly molecular ferroelectrics and pyroelectrics, have been developed. In these materials, the polarization switching usually proceeds via ion displacement and reorientation of polar molecules, which are responsible for the change in ionic polarization and orientational polarization, respectively. Recently, the development of electronic ferroelectrics, in which the mechanism of polarization change is charge ordering and electron transfer, has attracted great attention. In this article, representative examples of electronic ferroelectrics are summarized, including (TMTTF)2X (TMTTF = tetramethyl-tetrathiafulvalene, X = anion), α-(BEDT-TTF)2I3 (BEDT-TTF = bis(ethylenedithio)-tetrathiafulvalene), TTF-CA (TTF = tetrathiafulvalene, CA = p-chloranil), and [(n-C3H7)4N][FeIIIFeII(dto)3] (dto = 1,2-dithiooxalate = C2O2S2). Furthermore, polarization switching materials using directional electron transfer in nonferroelectrics, the so-called electronic pyroelectrics, such as [(Cr(SS-cth))(Co(RR-cth))(μ-dhbq)](PF6)3 (dhbq = deprotonated 2,5-dihydroxy-1,4-benzoquinone, cth = 5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraaza-cyclotetradecane), are introduced. Future prospects are also discussed, particularly the development of new properties in polarization switching through the manipulation of electronic polarization in electronic ferroelectrics and electronic pyroelectrics by taking advantage of the inherent properties of electrons.
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Affiliation(s)
- Sheng-Qun Su
- Institute for Materials Chemistry and Engineering & IRCCS, Kyushu University 744 Motooka, Nishi-ku Fukuoka 819-0395 Japan
| | - Shu-Qi Wu
- Institute for Materials Chemistry and Engineering & IRCCS, Kyushu University 744 Motooka, Nishi-ku Fukuoka 819-0395 Japan
| | - Shinji Kanegawa
- Institute for Materials Chemistry and Engineering & IRCCS, Kyushu University 744 Motooka, Nishi-ku Fukuoka 819-0395 Japan
| | - Kaoru Yamamoto
- Department of Applied Physics, Okayama University of Science Okayama 700-0005 Japan
| | - Osamu Sato
- Institute for Materials Chemistry and Engineering & IRCCS, Kyushu University 744 Motooka, Nishi-ku Fukuoka 819-0395 Japan
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5
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Chen Z, Lu X, Liu J, Qin W. Dimerization Triggered Magnetoelectric Coupling Effect and Magnetic Anisotropy in Organic Ternary Crystals. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2207143. [PMID: 36543359 DOI: 10.1002/smll.202207143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Revised: 12/01/2022] [Indexed: 06/17/2023]
Abstract
Developing a new universal strategy to design all organic ferromagnets or multiferroics with satisfactory properties always remains challenging. In this work, ternary charge transfer crystals are fabricated to realize organic multiferroic magnetoelectric coupling effect. Through incorporating the third component into binary crystals, a dimerization between neighbor donor and acceptor is induced to form a lattice symmetry breaking, where a nonpolar to polar phase transition is ensuing to lead to a dipolar polarization. Magnetic field can effectively tune the dipolar polarization to present a magnetoelectric coupling effect. Moreover, the introduction of the third component can result in a rearrangement in molecular configuration to modify the electron-phonon interaction. As a result, anisotropic magnetism is observed due to anisotropic electron-phonon coupling in ternary crystals. Overall, this study forecasts that incorporating an appropriate third component is a potential method for designing all organic multiferroics.
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Affiliation(s)
- Zhiyan Chen
- School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, P. R. China
| | - Xiangqian Lu
- School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, P. R. China
| | - Jianqiang Liu
- School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, P. R. China
| | - Wei Qin
- School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, P. R. China
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6
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Kumar J, Dey K, Panja SN, Nair S. Anomalous dielectric response in the triple perovskite ruthenate Ba 3BiRu 2O 9. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 34:465401. [PMID: 36063793 DOI: 10.1088/1361-648x/ac8f7c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Accepted: 09/05/2022] [Indexed: 06/15/2023]
Abstract
We have investigated the magnetic, dielectric and thermal properties of theSRu= 1 magnetic dimer Ba3BiRu2O9, which is known to exhibit a spin-gap opening in conjunction with a first-order magneto-elastic phase transition at ∼175 K. Above the spin-gap temperature, the temperature dependence dielectric constant shows a peak like feature with pronounced frequency dependence. The critical slowing down behavior of this frequency dispersion suggests that a ferroelectric relaxor like electrical glassy state exists above the spin-gap opening temperature regime. The extermination of frequency dispersion-right at the magneto-elastic phase transition, is suggestive of a strong coupling between the lattice and charge-spin degrees of freedom in this triple perovskite system.
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Affiliation(s)
- Jitender Kumar
- Department of Physics, Indian Institute of Science Education and Research, Dr Homi Bhabha Road, Pune 411008, India
| | - Kaustav Dey
- Department of Physics, Indian Institute of Science Education and Research, Dr Homi Bhabha Road, Pune 411008, India
| | - Soumendra Nath Panja
- Department of Physics, Indian Institute of Science Education and Research, Dr Homi Bhabha Road, Pune 411008, India
| | - Sunil Nair
- Department of Physics, Indian Institute of Science Education and Research, Dr Homi Bhabha Road, Pune 411008, India
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7
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Yen PTW, Wu HC, Huang SM. First-principles study of the crystal and magnetic structures of multiferroic Cu 2OCl 2. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 34:335602. [PMID: 35654030 DOI: 10.1088/1361-648x/ac75a2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Accepted: 06/01/2022] [Indexed: 06/15/2023]
Abstract
Recently, the discovery of multiferroicity in pyrochlore-like compound Cu2OCl2has generated significant interest, and several studies have been performed in this area. This transition metal oxychloride is unique because the divalent copper atoms create anS=1/2correlated insulator and the pyrochlore lattice tends to frustrate spins. From neutron powder diffraction measurements, an incommensurate magnetic order of the ordering vectorq=(0.827,0,0)emerges below the Néel temperature of 70 K. At this temperature or slightly above, ferroelectricity (FE) or antiferroelectricity, accompanying a lattice distortion, has been observed. Experimentally, some discrepancies remain. In this paper, we report our first-principles simulation results by evaluating the possible lattice and spin spiral states. We found that theFdddstructure is not more stable thanFdd2(a), which is supported by our reexamination of the x-ray diffraction data. In addition, we find that after we include magnetism in the calculation, it predicts that theFdd2(a)lattice with a helical (proper screw) spin structure is energetically more stable than other spin configurations. Our results indicate charge-order-driven FE that subsequently induces magnetism.
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Affiliation(s)
- Peter Tsung-Wen Yen
- Physics Department, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
- Center for Crystal Researches, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
- Center for Theoretical and Computational Physics, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
| | - Hung-Cheng Wu
- Physics Department, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
| | - Shin-Ming Huang
- Physics Department, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
- Center for Crystal Researches, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
- Center for Theoretical and Computational Physics, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
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8
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Berlie A, Pratt FL, Huddart BM, Lancaster T, Cottrell SP. Muon-Nitrogen Quadrupolar Level Crossing Resonance in a Charge Transfer Salt. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2022; 126:7529-7534. [PMID: 35558820 PMCID: PMC9082611 DOI: 10.1021/acs.jpcc.2c00617] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Revised: 04/04/2022] [Indexed: 06/15/2023]
Abstract
Although muons are primarily regarded as a local spin probe, they can also access the charge state of an atom or molecule via quadrupolar level crossing resonance (QLCR) spectroscopy. We use Li+TCNQ- (TCNQ = 7,7,8,8-tetracyanoquinodimethane), a simple charge transfer salt, to test the potential of this technique in molecular systems by studying the interaction of a positive muon with the TCNQ nitrogen atoms. We show that both a positive muon and muonium are able to add to the nitrogen, leading to a singlet spin state for the addition molecule. This produces a characteristic three line QLCR spectrum, with the observed line positions and intensities determined by the principal values and orientation of the electric field gradient tensor at the nitrogen. Ab initio calculation of this field gradient and the resulting QLCR spectrum give good agreement with the experiment. A nonresonant background contribution to the relaxation rate also provides evidence for spin excitations rapidly diffusing along the TCNQ chains. These reflect mobile unpaired electrons introduced by muonium addition. It is thus shown that a single set of muon measurements can be sensitive to both spin and charge degrees of freedom in the same molecular material.
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Affiliation(s)
- Adam Berlie
- ISIS
Neutron and Muon Source, STFC Rutherford
Appleton Laboratory, Chilton, Oxfordshire OX11 0QX, United Kingdom
- Department
of Physics, Durham University, South Road, Durham DH1 3LE, United
Kingdom
| | - Francis L. Pratt
- ISIS
Neutron and Muon Source, STFC Rutherford
Appleton Laboratory, Chilton, Oxfordshire OX11 0QX, United Kingdom
| | - Benjamin M. Huddart
- Department
of Physics, Durham University, South Road, Durham DH1 3LE, United
Kingdom
| | - Tom Lancaster
- Department
of Physics, Durham University, South Road, Durham DH1 3LE, United
Kingdom
| | - Stephen P. Cottrell
- ISIS
Neutron and Muon Source, STFC Rutherford
Appleton Laboratory, Chilton, Oxfordshire OX11 0QX, United Kingdom
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9
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Berlie A, Terry I, Szablewski M, Telling M, Apperley D, Hodgkinson P, Zeller D. A study of the dynamics and structure of the dielectric anomaly within the molecular solid TEA(TCNQ) 2. Phys Chem Chem Phys 2022; 24:7481-7492. [PMID: 35274651 DOI: 10.1039/d2cp00142j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
With rising interest in organic-based functional materials, it is important to understand the nature of magnetic and electrical transitions within these types of systems. One intriguing material is triethylammonium bis-7,7,8,8-tetracyanoquinodimethane (TEA(TCNQ)2) where there is an order-disorder transition at ∼220 K. This work focuses on novel neutron scattering techniques to understand the motion of the TEA cations at this transition and explain why we see the dielectric behaviour and possible ferroelectricity within this type of system. We show that the motion of the methyl groups of the TEA cation is spatially restricted below 220 K, whereas above the dielectric anomaly at 220 K, they are free to re-orientate, which ultimately leads to some rich behaviour that could be further exploited. Lastly, we also study the dynamics at this transition using a variety of additional techniques, helping to provide a consistent picture of the motions of the cations.
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Affiliation(s)
- Adam Berlie
- ISIS Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Chilton, Oxfordshire, OX11 0QX, UK.
| | - Ian Terry
- Department of Physics, Durham University, South Road, Durham, DH1 3LE, UK
| | - Marek Szablewski
- Department of Physics, Durham University, South Road, Durham, DH1 3LE, UK
| | - Mark Telling
- ISIS Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Chilton, Oxfordshire, OX11 0QX, UK.
| | - David Apperley
- Department of Chemistry, Durham University, South Road, Durham, DH1 3LE, UK
| | - Paul Hodgkinson
- Department of Chemistry, Durham University, South Road, Durham, DH1 3LE, UK
| | - Dominik Zeller
- Institut Laue Langevin, BP 156, 38042 Grenoble Cedex 9, France
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10
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Hughey KD, Lee M, Nam J, Clune AJ, O'Neal KR, Tian W, Fishman RS, Ozerov M, Lee J, Zapf VS, Musfeldt JL. High-Field Magnetoelectric and Spin-Phonon Coupling in Multiferroic (NH 4) 2[FeCl 5·(H 2O)]. Inorg Chem 2022; 61:3434-3442. [PMID: 35171587 DOI: 10.1021/acs.inorgchem.1c03311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We combine high field polarization, magneto-infrared spectroscopy, and lattice dynamics calculations with prior magnetization to explore the properties of (NH4)2[FeCl5·(H2O)]─a type II molecular multiferroic in which the mixing between charge, structure, and magnetism is controlled by intermolecular hydrogen and halogen bonds. Electric polarization is sensitive to the series of field-induced spin reorientations, increasing linearly with the field and reaching a maximum before collapsing to zero across the quasi-collinear to collinear-sinusoidal reorientation due to the restoration of inversion symmetry. Magnetoelectric coupling is on the order of 1.2 ps/m for the P∥c, H∥c configuration between 5 and 25 T at 1.5 K. In this range, the coupling takes place via an orbital hybridization mechanism. Other forms of mixing are active in (NH4)2[FeCl5·(H2O)] as well. Magneto-infrared spectroscopy reveals that all of the vibrational modes below 600 cm-1 are sensitive to the field-induced transition to the fully saturated magnetic state at 30 T. We analyze these local lattice distortions and use frequency shifts to extract spin-phonon coupling constants for the Fe-O stretch, Fe-OH2 rock, and NH4+ libration. Inspection also reveals subtle symmetry breaking of the ammonium counterions across the ferroelectric transition. The coexistence of such varied mixing processes in a platform with intermolecular hydrogen- and halogen-bonding opens the door to greater understanding of multiferroics and magnetoelectrics governed by through-space interactions.
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Affiliation(s)
- Kendall D Hughey
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Minseong Lee
- National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Jisoo Nam
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, Korea
| | - Amanda J Clune
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Kenneth R O'Neal
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Wei Tian
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Randy S Fishman
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Mykhaylo Ozerov
- National High Magnetic Field Laboratory, Florida State University, Florida, 32310, United States
| | - JunHee Lee
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, Korea
| | - Vivien S Zapf
- National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Janice L Musfeldt
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States.,Department of Physics, University of Tennessee, Knoxville, Tennessee 37996, United States
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11
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Huang Y, Mitchell T, Yost DC, Hu Y, Benedict JB, Grossman JC, Ren S. Emerged Metallicity in Molecular Ferromagnetic Wires. NANO LETTERS 2021; 21:9746-9753. [PMID: 34757755 DOI: 10.1021/acs.nanolett.1c03663] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Supramolecular engineering bridges molecular assembly with macromolecular charge-transfer salts, promising the design to construct supramolecular architectures that integrate cooperative properties difficult or impossible to find in conventional lattices. Here, we report the crystal engineering design and kinetic growth of one-dimensional supramolecular wires composed of bis(ethylenedithio)tetrathiafulvalene (ET+) cation and polymeric Cu[N(CN)2]2- anion. A bulk ferromagnetic order is discovered for filling up the gap where strong ferromagnetism is missing in such ET molecule-based charge-transfer salts. Metallicity is induced by electric current from the semiconducting wire, which is attributed to strain effect by tuning its close molecular contact. This structural feature is evidenced through the combination of various mechanistic spectroscopic studies. Electric dipole is established from the close molecular contacts and is suggestive to stabilize ferromagnetic spin interaction through anions bridging spin sites. The breakthrough shown here provides a pathway to explore low-dimensional supramolecular materials exhibiting strong electron correlation, metallicity, and ferromagnetism.
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Affiliation(s)
- Yulong Huang
- Department of Mechanical and Aerospace Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States
| | - Travis Mitchell
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States
| | - Dillon C Yost
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Yong Hu
- Department of Mechanical and Aerospace Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States
| | - Jason B Benedict
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States
| | - Jeffrey C Grossman
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Shenqiang Ren
- Department of Mechanical and Aerospace Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States
- Research and Education in energy, Environment and Water (RENEW) Institute, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States
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12
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Park C, Lee K, Koo M, Park C. Soft Ferroelectrics Enabling High-Performance Intelligent Photo Electronics. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2004999. [PMID: 33338279 DOI: 10.1002/adma.202004999] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Revised: 08/27/2020] [Indexed: 06/12/2023]
Abstract
Soft ferroelectrics based on organic and organic-inorganic hybrid materials have gained much interest among researchers owing to their electrically programmable and remnant polarization. This allows for the development of numerous flexible, foldable, and stretchable nonvolatile memories, when combined with various crystal engineering approaches to optimize their performance. Soft ferroelectrics have been recently considered to have an important role in the emerging human-connected electronics that involve diverse photoelectronic elements, particularly those requiring precise programmable electric fields, such as tactile sensors, synaptic devices, displays, photodetectors, and solar cells for facile human-machine interaction, human safety, and sustainability. This paper provides a comprehensive review of the recent developments in soft ferroelectric materials with an emphasis on their ferroelectric switching principles and their potential application in human-connected intelligent electronics. Based on the origins of ferroelectric atomic and/or molecular switching, the soft ferroelectrics are categorized into seven subgroups. In this review, the efficiency of soft ferroelectrics with their distinct ferroelectric characteristics utilized in various human-connected electronic devices with programmable electric field is demonstrated. This review inspires further research to utilize the remarkable functionality of soft electronics.
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Affiliation(s)
- Chanho Park
- Department of Materials Science and Engineering, Yonsei University, Yonsei-ro 50, Seodaemun-gu, Seoul, 03722, Republic of Korea
| | - Kyuho Lee
- Department of Materials Science and Engineering, Yonsei University, Yonsei-ro 50, Seodaemun-gu, Seoul, 03722, Republic of Korea
| | - Min Koo
- Department of Materials Science and Engineering, Yonsei University, Yonsei-ro 50, Seodaemun-gu, Seoul, 03722, Republic of Korea
| | - Cheolmin Park
- Department of Materials Science and Engineering, Yonsei University, Yonsei-ro 50, Seodaemun-gu, Seoul, 03722, Republic of Korea
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13
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Yamamoto HM. Phase-Transition Devices Based on Organic Mott Insulators. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2021. [DOI: 10.1246/bcsj.20210256] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Hiroshi M. Yamamoto
- Institute for Molecular Science, Okazaki, Aichi 444-8585, Japan
- SOKENDAI (The Graduate University for Advanced Studies), Okazaki, Aichi 444-8585, Japan
- RIKEN, Wako, Saitama 351-0198, Japan
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14
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Abstract
This short review article provides the reader with a summary of the history of organic conductors. To retain a neutral and objective point of view regarding the history, background, novelty, and details of each research subject within this field, a thousand references have been cited with full titles and arranged in chronological order. Among the research conducted over ~70 years, topics from the last two decades are discussed in more detail than the rest. Unlike other papers in this issue, this review will help readers to understand the origin of each topic within the field of organic conductors and how they have evolved. Due to the advancements achieved over these 70 years, the field is nearing new horizons. As history is often a reflection of the future, this review is expected to show the future directions of this research field.
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15
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El Baggari I, Baek DJ, Zachman MJ, Lu D, Hikita Y, Hwang HY, Nowadnick EA, Kourkoutis LF. Charge order textures induced by non-linear couplings in a half-doped manganite. Nat Commun 2021; 12:3747. [PMID: 34145244 PMCID: PMC8213702 DOI: 10.1038/s41467-021-24026-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Accepted: 05/28/2021] [Indexed: 11/13/2022] Open
Abstract
The self-organization of strongly interacting electrons into superlattice structures underlies the properties of many quantum materials. How these electrons arrange within the superlattice dictates what symmetries are broken and what ground states are stabilized. Here we show that cryogenic scanning transmission electron microscopy (cryo-STEM) enables direct mapping of local symmetries and order at the intra-unit-cell level in the model charge-ordered system Nd1/2Sr1/2MnO3. In addition to imaging the prototypical site-centered charge order, we discover the nanoscale coexistence of an exotic intermediate state which mixes site and bond order and breaks inversion symmetry. We further show that nonlinear coupling of distinct lattice modes controls the selection between competing ground states. The results demonstrate the importance of lattice coupling for understanding and manipulating the character of electronic self-organization and that cryo-STEM can reveal local order in strongly correlated systems at the atomic scale. In this paper, the authors demonstrate that cryogenic scanning transmission electron microscopy allows for the direct mapping of the local arrangements and symmetries of electronic order, providing a useful method for studying strongly correlated systems. They show this using the example of Nd1/2Sr1/2MnO3, a model charge ordered material.
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Affiliation(s)
| | - David J Baek
- School of Electrical and Computer Engineering, Cornell University, Ithaca, NY, USA.,Intel Corp., Hillsboro, OR, USA
| | - Michael J Zachman
- School of Applied and Engineering Physics, Cornell University, Ithaca, NY, USA.,Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | - Di Lu
- Department of Physics, Stanford University, Stanford, CA, USA.,Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, USA.,Materials Science and Engineering, Northwestern University, Evanston, IL, USA
| | - Yasuyuki Hikita
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, USA.,Department of Applied Physics, Stanford University, Stanford, CA, USA
| | - Harold Y Hwang
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, USA.,Department of Applied Physics, Stanford University, Stanford, CA, USA
| | - Elizabeth A Nowadnick
- Department of Materials Science and Engineering, University of California Merced, Merced, CA, USA
| | - Lena F Kourkoutis
- School of Applied and Engineering Physics, Cornell University, Ithaca, NY, USA. .,Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, NY, USA.
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16
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Liu X, Wang B, Huang X, Dong X, Ren Y, Zhao H, Long L, Zheng L. Room-Temperature Magnetoelectric Coupling in Electronic Ferroelectric Film based on [( n-C 3H 7) 4N][Fe IIIFe II(dto) 3] (dto = C 2O 2S 2). J Am Chem Soc 2021; 143:5779-5785. [PMID: 33847129 DOI: 10.1021/jacs.1c00601] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Great importance has been attached to magnetoelectric coupling in multiferroic thin films owing to their extremely practical use in a new generation of devices. Here, a film of [(n-C3H7)4N][FeIIIFeII(dto)3] (1; dto = C2O2S2) was fabricated using a simple stamping process. As was revealed by our experimental results, in-plane ferroelectricity over a wide temperature range from 50 to 300 K was induced by electron hopping between FeII and FeIII sites. This mechanism was further confirmed by the ferroelectric observation of the compound [(n-C3H7)4N][FeIIIZnII(dto)3] (2; dto = C2O2S2), in which FeII ions were replaced by nonmagnetic metal ZnII ions, resulting in no obvious ferroelectric polarization. However, both ferroelectricity and magnetism are related to the magnetic Fe ions, implying a strong magnetoelectric coupling in 1. Through piezoresponse force microscopy (PFM), the observation of magnetoelectric coupling was achieved by manipulating ferroelectric domains under an in-plane magnetic field. The present work not only provides new insight into the design of molecular-based electronic ferroelectric/magnetoelectric materials but also paves the way for practical applications in a new generation of electronic devices.
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Affiliation(s)
- Xiaolin Liu
- Collaborative Innovation Center of Chemistry for Energy Materials, State Key Laboratory of Physical Chemistry of Solid Surfaces, and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, People's Republic of China
| | - Bin Wang
- Collaborative Innovation Center of Chemistry for Energy Materials, State Key Laboratory of Physical Chemistry of Solid Surfaces, and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, People's Republic of China
| | - Xiaofeng Huang
- Collaborative Innovation Center of Chemistry for Energy Materials, State Key Laboratory of Physical Chemistry of Solid Surfaces, and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, People's Republic of China
| | - Xinwei Dong
- Department of Physics and Institute of Theoretical Physics and Astrophysics, Xiamen University, Xiamen 361005, People's Republic of China
| | - Yanping Ren
- Collaborative Innovation Center of Chemistry for Energy Materials, State Key Laboratory of Physical Chemistry of Solid Surfaces, and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, People's Republic of China
| | - Haixia Zhao
- Collaborative Innovation Center of Chemistry for Energy Materials, State Key Laboratory of Physical Chemistry of Solid Surfaces, and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, People's Republic of China
| | - Lasheng Long
- Collaborative Innovation Center of Chemistry for Energy Materials, State Key Laboratory of Physical Chemistry of Solid Surfaces, and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, People's Republic of China
| | - Lansun Zheng
- Collaborative Innovation Center of Chemistry for Energy Materials, State Key Laboratory of Physical Chemistry of Solid Surfaces, and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, People's Republic of China
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17
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Yamakawa H, Miyamoto T, Morimoto T, Takamura N, Liang S, Yoshimochi H, Terashige T, Kida N, Suda M, Yamamoto HM, Mori H, Miyagawa K, Kanoda K, Okamoto H. Terahertz-field-induced polar charge order in electronic-type dielectrics. Nat Commun 2021; 12:953. [PMID: 33574221 PMCID: PMC7878852 DOI: 10.1038/s41467-021-20925-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Accepted: 12/29/2020] [Indexed: 11/09/2022] Open
Abstract
Ultrafast electronic-phase change in solids by light, called photoinduced phase transition, is a central issue in the field of non-equilibrium quantum physics, which has been developed very recently. In most of those phenomena, charge or spin orders in an original phase are melted by photocarrier generations, while an ordered state is usually difficult to be created from a non-ordered state by a photoexcitation. Here, we demonstrate that a strong terahertz electric-field pulse changes a Mott insulator of an organic molecular compound in κ-(ET)2Cu[N(CN)2]Cl (ET = bis(ethylenedithio)tetrathiafulvalene), to a macroscopically polarized charge-order state; herein, electronic ferroelectricity is induced by the collective intermolecular charge transfers in each dimer. In contrast, in an isostructural compound, κ-(ET)2Cu2(CN)3, which shows the spin-liquid state at low temperatures, a similar polar charge order is not stabilized by the same terahertz pulse. From the comparative studies of terahertz-field-induced second-harmonic-generation and reflectivity changes in the two compounds, we suggest the possibility that a coupling of charge and spin degrees of freedom would play important roles in the stabilization of polar charge order.
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Affiliation(s)
- H Yamakawa
- Department of Advanced Materials Science, University of Tokyo, Chiba, 277-8561, Japan
| | - T Miyamoto
- Department of Advanced Materials Science, University of Tokyo, Chiba, 277-8561, Japan.
| | - T Morimoto
- Department of Advanced Materials Science, University of Tokyo, Chiba, 277-8561, Japan
| | - N Takamura
- Department of Advanced Materials Science, University of Tokyo, Chiba, 277-8561, Japan
| | - S Liang
- Department of Advanced Materials Science, University of Tokyo, Chiba, 277-8561, Japan
| | - H Yoshimochi
- Department of Applied Physics, University of Tokyo, Bunkyo-Ku, 113-8656, Japan
| | - T Terashige
- AIST-UTokyo Advanced Operand-Measurement Technology Open Innovation Laboratory, National Institute of Advanced Industrial Science and Technology, Chiba, 277-8589, Japan
| | - N Kida
- Department of Advanced Materials Science, University of Tokyo, Chiba, 277-8561, Japan
| | - M Suda
- Division of Functional Molecular Systems, Research Center of Integrative Molecular Systems (CIMoS), Institute for Molecular Science, Okazaki, 444-8585, Japan.,Department of Molecular Engineering, Kyoto University, Kyoto, 615-8510, Japan
| | - H M Yamamoto
- Division of Functional Molecular Systems, Research Center of Integrative Molecular Systems (CIMoS), Institute for Molecular Science, Okazaki, 444-8585, Japan
| | - H Mori
- Institute for Solid State Physics, University of Tokyo, Chiba, 277-8581, Japan
| | - K Miyagawa
- Department of Applied Physics, University of Tokyo, Bunkyo-Ku, 113-8656, Japan
| | - K Kanoda
- Department of Applied Physics, University of Tokyo, Bunkyo-Ku, 113-8656, Japan
| | - H Okamoto
- Department of Advanced Materials Science, University of Tokyo, Chiba, 277-8561, Japan. .,AIST-UTokyo Advanced Operand-Measurement Technology Open Innovation Laboratory, National Institute of Advanced Industrial Science and Technology, Chiba, 277-8589, Japan.
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18
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Wei M, Song K, Yang Y, Huang Q, Tian Y, Hao X, Qin W. Organic Multiferroic Magnetoelastic Complexes. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e2003293. [PMID: 32875629 DOI: 10.1002/adma.202003293] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Revised: 07/31/2020] [Indexed: 06/11/2023]
Abstract
The design of crystal structures aids the discovery of interesting physical phenomena in organic crystals. In this work, the optimization of the coronene-tetracyanoquinodimethane (TCNQ) structure generates non-degenerate energy levels of spin-up and spin-down electrons after charge transfer, producing spontaneous spin polarization, leading to pronounced ferromagnetism. The deformed crystal lattice can significantly affect the saturation magnetization of organic ferromagnets to present a remarkable magnetoelastic coupling. Furthermore, the magnetic-field-induced lattice shrinkage of the ferromagnetic crystals supports a spin-lattice-interaction-dependent magnetoelastic coupling. This concept of organic magnetoelastic coupling will pave the way for the rapid mechanical control of spin polarization in organic multiferroic magnetoelastic materials.
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Affiliation(s)
- Mengmeng Wei
- School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, China
| | - Kepeng Song
- School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, China
| | - Yuying Yang
- School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, China
| | - Qikun Huang
- School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, China
| | - Yufeng Tian
- School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, China
| | - Xiaotao Hao
- School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, China
- ARC Centre of Excellence in Exciton Science, School of Chemistry, The University of Melbourne, Parkville, Victoria, 3010, Australia
| | - Wei Qin
- School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, China
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19
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Li D, Wang X, Zhao H, Ren Y, Zhuang G, Long L, Zheng L. The Mechanism of the Magnetodielectric Response in a Molecule‐Based Trinuclear Iron Cluster Material. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202007813] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Dong Li
- Collaborative Innovation Center of Chemistry for Energy Materials State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 P. R. China
| | - Xuan Wang
- Collaborative Innovation Center of Chemistry for Energy Materials State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 P. R. China
| | - Hai‐Xia Zhao
- Collaborative Innovation Center of Chemistry for Energy Materials State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 P. R. China
| | - Yan‐Ping Ren
- Collaborative Innovation Center of Chemistry for Energy Materials State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 P. R. China
| | - Gui‐Lin Zhuang
- Institute of Industrial Catalysis College of Chemical Engineering Zhejiang University of Technology Hangzhou 310032 P. R. China
| | - La‐Sheng Long
- Collaborative Innovation Center of Chemistry for Energy Materials State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 P. R. China
| | - Lan‐Sun Zheng
- Collaborative Innovation Center of Chemistry for Energy Materials State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 P. R. China
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20
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Clune A, Harms N, O'Neal KR, Hughey K, Smith KA, Obeysekera D, Haddock J, Dalal NS, Yang J, Liu Z, Musfeldt JL. Developing the Pressure-Temperature-Magnetic Field Phase Diagram of Multiferroic [(CH 3) 2NH 2]Mn(HCOO) 3. Inorg Chem 2020; 59:10083-10090. [PMID: 32635719 DOI: 10.1021/acs.inorgchem.0c01225] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We combined Raman scattering and magnetic susceptibility to explore the properties of [(CH3)2NH2]Mn(HCOO)3 under compression. Analysis of the formate bending mode reveals a broad two-phase region surrounding the 4.2 GPa critical pressure that becomes increasingly sluggish below the order-disorder transition due to the extensive hydrogen-bonding network. Although the paraelectric and ferroelectric phases have different space groups at ambient-pressure conditions, they both drive toward P1 symmetry under compression. This is a direct consequence of how the order-disorder transition changes under pressure. We bring these findings together with prior magnetization work to create a pressure-temperature-magnetic field phase diagram, unveiling entanglement, competition, and a progression of symmetry-breaking effects that underlie functionality in this molecule-based multiferroic. That the high-pressure P1 phase is a subgroup of the ferroelectric Cc suggests the possibility of enhanced electric polarization as well as opportunity for strain control.
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Affiliation(s)
- Amanda Clune
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Nathan Harms
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Kenneth R O'Neal
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Kendall Hughey
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Kevin A Smith
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Dimuthu Obeysekera
- Department of Physics, Central Michigan University, Mount Pleasant, Michigan 48859, United States.,Department of Physics, New Jersey Institute of Technology, Newark, New Jersey 07102, United States
| | - John Haddock
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States.,National High Magnetic Field Laboratory, Tallahassee, Florida 32310, United States
| | - Naresh S Dalal
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States.,National High Magnetic Field Laboratory, Tallahassee, Florida 32310, United States
| | - Junjie Yang
- Department of Physics, Central Michigan University, Mount Pleasant, Michigan 48859, United States.,Department of Physics, New Jersey Institute of Technology, Newark, New Jersey 07102, United States
| | - Zhenxian Liu
- Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607-7059, United States
| | - Janice L Musfeldt
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States.,Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, United States
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21
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Li D, Wang X, Zhao H, Ren Y, Zhuang G, Long L, Zheng L. The Mechanism of the Magnetodielectric Response in a Molecule‐Based Trinuclear Iron Cluster Material. Angew Chem Int Ed Engl 2020; 59:14409-14413. [DOI: 10.1002/anie.202007813] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Indexed: 01/17/2023]
Affiliation(s)
- Dong Li
- Collaborative Innovation Center of Chemistry for Energy Materials State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 P. R. China
| | - Xuan Wang
- Collaborative Innovation Center of Chemistry for Energy Materials State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 P. R. China
| | - Hai‐Xia Zhao
- Collaborative Innovation Center of Chemistry for Energy Materials State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 P. R. China
| | - Yan‐Ping Ren
- Collaborative Innovation Center of Chemistry for Energy Materials State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 P. R. China
| | - Gui‐Lin Zhuang
- Institute of Industrial Catalysis College of Chemical Engineering Zhejiang University of Technology Hangzhou 310032 P. R. China
| | - La‐Sheng Long
- Collaborative Innovation Center of Chemistry for Energy Materials State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 P. R. China
| | - Lan‐Sun Zheng
- Collaborative Innovation Center of Chemistry for Energy Materials State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 P. R. China
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22
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Affiliation(s)
- Zongrui Wang
- School of Materials Science and EngineeringNanyang Technological University 50 Nanyang Avenue 639798 Singapore Singapore
| | - Qichun Zhang
- School of Materials Science and EngineeringNanyang Technological University 50 Nanyang Avenue 639798 Singapore Singapore
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23
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Liu C, Niazi MR, Perepichka DF. Strong Enhancement of π‐Electron Donor/Acceptor Ability by Complementary DD/AA Hydrogen Bonding. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201910288] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Cheng‐Hao Liu
- Department of ChemistryMcGill University 801 Sherbrooke Street W Quebec H3A 0B1 Canada
| | - Muhammad Rizwan Niazi
- Department of ChemistryMcGill University 801 Sherbrooke Street W Quebec H3A 0B1 Canada
| | - Dmitrii F. Perepichka
- Department of ChemistryMcGill University 801 Sherbrooke Street W Quebec H3A 0B1 Canada
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24
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Liu CH, Niazi MR, Perepichka DF. Strong Enhancement of π-Electron Donor/Acceptor Ability by Complementary DD/AA Hydrogen Bonding. Angew Chem Int Ed Engl 2019; 58:17312-17321. [PMID: 31560447 DOI: 10.1002/anie.201910288] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2019] [Indexed: 11/11/2022]
Abstract
π-Conjugated organic materials possess a wide range of tunable optoelectronic properties which are dictated by their molecular structure and supramolecular arrangement. While many efforts have been put into tuning the molecular structure to achieve the desired properties, rational supramolecular control remains a challenge. Here, we report a novel series of supramolecular materials formed by the co-assembly of weak π-electron donor (indolo[2,3-a]carbazole) and acceptor (aromatic o-quinones) molecules via complementary hydrogen bonding. The resulting polarization creates a drastic perturbation of the molecular energy levels, causing strong charge transfer in the weak donor-acceptor pairs. This leads to a significant lowering (up to 1.5 eV) of the band gaps, intense absorption in the near-IR region, very short π-stacking distances (≥3.15 Å), and strong ESR signals in the co-crystals. By varying the strength of the acceptor, the characteristics of the complexes can be tuned between intrinsic, gate-, or light-induced semiconductivity with a p-type or ambipolar transport mechanism.
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Affiliation(s)
- Cheng-Hao Liu
- Department of Chemistry, McGill University, 801 Sherbrooke Street W, Quebec, H3A 0B1, Canada
| | - Muhammad Rizwan Niazi
- Department of Chemistry, McGill University, 801 Sherbrooke Street W, Quebec, H3A 0B1, Canada
| | - Dmitrii F Perepichka
- Department of Chemistry, McGill University, 801 Sherbrooke Street W, Quebec, H3A 0B1, Canada
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25
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Abstract
Abstract
Multiferroic materials, showing ordering of both electrical and magnetic degrees of freedom, are promising candidates enabling the design of novel electronic devices. Various mechanisms ranging from geometrically or spin-driven improper ferroelectricity via lone-pairs, charge-order or -transfer support multiferroicity in single-phase or composite compounds. The search for materials showing these effects constitutes one of the most important research fields in solid-state physics during the last years, but scientific interest even traces back to the middle of the past century. Especially, a potentially strong coupling between spin and electric dipoles captured the interest to control via an electric field the magnetization or via a magnetic field the electric polarization. This would imply a promising route for novel electronics. Here, we provide a review about the dielectric and ferroelectric properties of various multiferroic systems ranging from type I multiferroics, in which magnetic and ferroelectric order develop almost independently of each other, to type II multiferroics, which exhibit strong coupling of magnetic and ferroelectric ordering. We thoroughly discuss the dielectric signatures of the ferroelectric polarization for BiFeO3, Fe3O4, DyMnO3 and an organic charge-transfer salt as well as show electric-field poling studies for the hexagonal manganites and a spin-spiral system LiCuVO4.
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26
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Matsuura M, Sasaki T, Iguchi S, Gati E, Müller J, Stockert O, Piovano A, Böhm M, Park JT, Biswas S, Winter SM, Valentí R, Nakao A, Lang M. Lattice Dynamics Coupled to Charge and Spin Degrees of Freedom in the Molecular Dimer-Mott Insulator κ-(BEDT-TTF)_{2}Cu[N(CN)_{2}]Cl. PHYSICAL REVIEW LETTERS 2019; 123:027601. [PMID: 31386497 DOI: 10.1103/physrevlett.123.027601] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2018] [Revised: 05/24/2019] [Indexed: 06/10/2023]
Abstract
Inelastic neutron scattering measurements on the molecular dimer-Mott insulator κ-(BEDT-TTF)_{2}Cu[N(CN)_{2}]Cl reveal a phonon anomaly in a wide temperature range. Starting from T_{ins}∼50-60 K where the charge gap opens, the low-lying optical phonon modes become overdamped upon cooling towards the antiferromagnetic ordering temperature T_{N}=27 K, where also a ferroelectric ordering at T_{FE}≈T_{N} occurs. Conversely, the phonon damping becomes small again when spins and charges are ordered below T_{N}, while no change of the lattice symmetry is observed across T_{N} in neutron diffraction measurements. We assign the phonon anomalies to structural fluctuations coupled to charge and spin degrees of freedom in the BEDT-TTF molecules.
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Affiliation(s)
- Masato Matsuura
- Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society (CROSS), Tokai, Ibaraki 319-1106, Japan
| | - Takahiko Sasaki
- Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
| | - Satoshi Iguchi
- Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
| | - Elena Gati
- Institute of Physics, Goethe-University Frankfurt, 60438 Frankfurt (M), Germany
| | - Jens Müller
- Institute of Physics, Goethe-University Frankfurt, 60438 Frankfurt (M), Germany
| | - Oliver Stockert
- Max-Planck-Institut für Chemische Physik fester Stoffe, D-01187 Dresden, Germany
| | - Andrea Piovano
- Institut Laue-Langevin, 71 avenue des Martyrs, 38042 Grenoble Cedex 9, France
| | - Martin Böhm
- Institut Laue-Langevin, 71 avenue des Martyrs, 38042 Grenoble Cedex 9, France
| | - Jitae T Park
- Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, Lichtenbergstr. 1, 85748 Garching, Germany
| | - Sananda Biswas
- Institute for Theoretical Physics, Goethe-University Frankfurt, 60438 Frankfurt (M), Germany
| | - Stephen M Winter
- Institute for Theoretical Physics, Goethe-University Frankfurt, 60438 Frankfurt (M), Germany
| | - Roser Valentí
- Institute for Theoretical Physics, Goethe-University Frankfurt, 60438 Frankfurt (M), Germany
| | - Akiko Nakao
- Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society (CROSS), Tokai, Ibaraki 319-1106, Japan
| | - Michael Lang
- Institute of Physics, Goethe-University Frankfurt, 60438 Frankfurt (M), Germany
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27
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Wang Z, Gao M, Wei M, Ren S, Hao XT, Qin W. Organic Chiral Charge Transfer Magnets. ACS NANO 2019; 13:4705-4711. [PMID: 30869866 DOI: 10.1021/acsnano.9b00988] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
In this work, through designing organic helix donor-acceptor complexes, one type of room-temperature chiral magnet was reported. Within these chiral charge transfer magnets, circularly polarized light could induce a larger saturation magnetization compared to linearly polarized light illumination with identical intensity. Moreover, the transmission light polarization from chiral magnets could be tuned via applying the magnetic field. Overall, room-temperature organic chiral magnets with optomagnetic effects will enhance the function of organic magnetochiral materials.
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Affiliation(s)
- Zhongxuan Wang
- School of Physics, State Key Laboratory of Crystal Materials , Shandong University , Jinan , 250100 , China
| | - Mingsheng Gao
- School of Physics, State Key Laboratory of Crystal Materials , Shandong University , Jinan , 250100 , China
| | - Mengmeng Wei
- School of Physics, State Key Laboratory of Crystal Materials , Shandong University , Jinan , 250100 , China
| | - Shenqiang Ren
- Department of Mechanical and Aerospace Engineering, Research and Education in Energy, Environment & Water (RENEW) Institute , University at Buffalo, The State University of New York , Buffalo , New York 14260 , United States
| | - Xiao-Tao Hao
- School of Physics, State Key Laboratory of Crystal Materials , Shandong University , Jinan , 250100 , China
| | - Wei Qin
- School of Physics, State Key Laboratory of Crystal Materials , Shandong University , Jinan , 250100 , China
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Xu B, Hu Y, Guan YS, Zhang Z, Ren S. Ubiquitous energy conversion of two-dimensional molecular crystals. NANOTECHNOLOGY 2019; 30:15LT01. [PMID: 30695761 DOI: 10.1088/1361-6528/ab02be] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Two-dimensional (2D) atomic crystals have triggered significant excitement due to their rich physics as well as potential industrial applications. The possibility of a molecular counterpart with scalable processability and superior performance is intriguing from both fundamental and applied perspectives. Here, we present the freestanding 2D molecular charge-transfer bis(ethylenedithio)tetrathiafulvalene-C60 crystals prepared by a modified Langmuir-Blodgett method, with precisely controlled few-layer thickness and centimeter-scale lateral dimension. The interconversion of intrinsic excited process, the long-range ordering and anisotropic stacking arrangement of the molecular layered crystals generate external stimuli responsive behaviors and anisotropic spin-charge conversion with magnetic energy conversion ability, as well as a superior UV photosensitivity. Moreover, the 2D freestanding crystals demonstrate superior magneto-electrical properties. These results suggest that a new class of 2D atomically thin molecular crystals with novel electronic, optical and magnetic properties have great potential for spintronic, energy and sensor applications.
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Spaldin NA, Ramesh R. Advances in magnetoelectric multiferroics. NATURE MATERIALS 2019; 18:203-212. [PMID: 30783227 DOI: 10.1038/s41563-018-0275-2] [Citation(s) in RCA: 301] [Impact Index Per Article: 60.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Accepted: 12/17/2018] [Indexed: 05/05/2023]
Abstract
The manipulation of magnetic properties by an electric field in magnetoelectric multiferroic materials has driven significant research activity, with the goal of realizing their transformative technological potential. Here, we review progress in the fundamental understanding and design of new multiferroic materials, advances in characterization and modelling tools to describe them, and the exploration of devices and applications. Focusing on the translation of the many scientific breakthroughs into technological innovations, we identify the key open questions in the field where targeted research activities could have maximum impact in transitioning scientific discoveries into real applications.
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Affiliation(s)
- N A Spaldin
- Materials Theory, ETH Zurich, Zürich, Switzerland.
| | - R Ramesh
- Department of Materials Science and Engineering, UC Berkeley, Berkeley, CA, USA
- Department of Physics, UC Berkeley, Berkeley, CA, USA
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
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30
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Guan YS, Zhong G, Hu Y, Cannella AF, Li C, Lee N, Jia Q, Lacy DC, Ren S. Magnetoelectric Radical Hydrocarbons. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1806263. [PMID: 30461087 DOI: 10.1002/adma.201806263] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Revised: 10/31/2018] [Indexed: 06/09/2023]
Abstract
The molecular radicals, systems with unpaired electrons of open-shell electronic structures, set the stage for a multidisciplinary science frontier relevant to the cooperative magnetic exchange interaction and magnetoelectric effect. Here ferroelectricity together with magnetic spin exchange coupling in molecular radical hydrocarbon solids is reported, representing a new class of magnetoelectrics. Electronic correlation through radical-radical interactions plays a decisive role in the coupling between magnetic and charge orders. A substantial photoconductance and visible-light photovoltaic effect are found in radical hydrocarbons. The ability to simultaneously control and retrieve the changes in magnetic and electrical responses opens up a new breadth of applications, such as radical magnetoelectrics, magnets, and optoelectronics.
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Affiliation(s)
- Ying-Shi Guan
- Department of Mechanical and Aerospace Engineering, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
- Research and Education in eNergy, Environment & Water (RENEW) Institute, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
| | - Guohua Zhong
- Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055, China
| | - Yong Hu
- Department of Mechanical and Aerospace Engineering, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
- Research and Education in eNergy, Environment & Water (RENEW) Institute, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
| | - Anthony F Cannella
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
| | - Changning Li
- Department of Mechanical and Aerospace Engineering, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
- Research and Education in eNergy, Environment & Water (RENEW) Institute, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
| | - Namhoon Lee
- Department of Mechanical and Aerospace Engineering, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
- Research and Education in eNergy, Environment & Water (RENEW) Institute, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
| | - Quanxi Jia
- Department of Materials Design and Innovation, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
| | - David C Lacy
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
| | - Shenqiang Ren
- Department of Mechanical and Aerospace Engineering, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
- Research and Education in eNergy, Environment & Water (RENEW) Institute, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
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31
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Yang Y, Liu G, Liu J, Wei M, Wang Z, Hao X, Maheswar Repaka DV, Ramanujan RV, Tao X, Qin W, Zhang Q. Anisotropic Magnetoelectric Coupling and Cotton-Mouton Effects in the Organic Magnetic Charge-Transfer Complex Pyrene-F 4TCNQ. ACS APPLIED MATERIALS & INTERFACES 2018; 10:44654-44659. [PMID: 30507119 DOI: 10.1021/acsami.8b16848] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Magnetoelectric coupling is of high current interest because of its potential applications in multiferroic memory devices. Although magnetoelectric coupling has been widely investigated in inorganic materials, such observations in organic materials are extremely rare. Here, we report our discovery that organic charge-transfer (CT) complex pyrene-2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (pyrene-F4TCNQ) can display anisotropic magnetoelectric coupling. Investigation of the crystal structure of pyrene-F4TCNQ complex demonstrates that the magnetoelectric coupling coefficient along the π-π interaction direction is much larger than the value along other directions. Furthermore, magnetoelectric coupling and magnetization can be tuned by changing the fluorine content in complexes. Besides, the Cotton-Mouton effect in pyrene-F4TCNQ is observed, enabling the control of optomagnetic devices. These results can pave the way for a new method for the future development of organic CT complexes and their applications in perpendicular memory devices and energy-transfer-related multiferroics.
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Affiliation(s)
- Yuying Yang
- School of Physics, State Key Laboratory of Crystal Materials , Shandong University , Jinan 250100 , China
| | - Guangfeng Liu
- School of Materials Science and Engineering , Nanyang Technological University , 50 Nanyang Avenue , 639798 , Singapore
| | - Jie Liu
- School of Physics, State Key Laboratory of Crystal Materials , Shandong University , Jinan 250100 , China
| | - Mengmeng Wei
- School of Physics, State Key Laboratory of Crystal Materials , Shandong University , Jinan 250100 , China
| | - Zhongxuan Wang
- School of Physics, State Key Laboratory of Crystal Materials , Shandong University , Jinan 250100 , China
| | - Xiaotao Hao
- School of Physics, State Key Laboratory of Crystal Materials , Shandong University , Jinan 250100 , China
- ARC Centre of Excellence in Exciton Science, School of Chemistry , The University of Melbourne , Parkville , Victoria 3010 , Australia
| | - D V Maheswar Repaka
- School of Materials Science and Engineering , Nanyang Technological University , 50 Nanyang Avenue , 639798 , Singapore
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences , Nanyang Technological University , 21 Nanyang Link , 637371 , Singapore
| | - Raju V Ramanujan
- School of Materials Science and Engineering , Nanyang Technological University , 50 Nanyang Avenue , 639798 , Singapore
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences , Nanyang Technological University , 21 Nanyang Link , 637371 , Singapore
| | - Xutang Tao
- School of Physics, State Key Laboratory of Crystal Materials , Shandong University , Jinan 250100 , China
| | - Wei Qin
- School of Physics, State Key Laboratory of Crystal Materials , Shandong University , Jinan 250100 , China
| | - Qichun Zhang
- School of Materials Science and Engineering , Nanyang Technological University , 50 Nanyang Avenue , 639798 , Singapore
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32
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Hughey KD, Clune AJ, Yokosuk MO, Li J, Abhyankar N, Ding X, Dalal NS, Xiang H, Smirnov D, Singleton J, Musfeldt JL. Structure-Property Relations in Multiferroic [(CH 3) 2NH 2] M(HCOO) 3 ( M = Mn, Co, Ni). Inorg Chem 2018; 57:11569-11577. [PMID: 30141625 DOI: 10.1021/acs.inorgchem.8b01609] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We bring together magnetization, infrared spectroscopy, and lattice dynamics calculations to uncover the magnetic field-temperature ( B- T) phase diagrams and vibrational properties of the [(CH3)2NH2] M(HCOO)3 ( M = Mn2+, Co2+, Ni2+) family of multiferroics. While the magnetically driven transition to the fully saturated state in [(CH3)2NH2]Mn(HCOO)3 takes place at 15.3 T, substitution with Ni or Co drives the critical fields up toward 100 T, an unexpectedly high energy scale for these compounds. Analysis of the infrared spectrum of the Mn and Ni compounds across TC reveals doublet splitting of the formate bending mode which functions as an order parameter of the ferroelectric transition. By contrast, [(CH3)2NH2]Co(HCOO)3 reveals a surprising framework rigidity across the order-disorder transition due to modest distortions around the Co2+ centers. The transition to the ferroelectric state is thus driven by the dimethylammonium cation freezing and the resulting hydrogen bonding. Under applied field, the Mn (and most likely, the Ni) compounds engage the formate bending mode to facilitate the transition to their fully saturated magnetic states, whereas the Co complex adopts a different mechanism involving formate stretching distortions to lower the overall magnetic energy. Similar structure-property relations involving substitution of transition-metal centers and control of the flexible molecular architecture are likely to exist in other molecule-based multiferroics.
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Affiliation(s)
- Kendall D Hughey
- Department of Chemistry , University of Tennessee , Knoxville , Tennessee 37996 , United States
| | - Amanda J Clune
- Department of Chemistry , University of Tennessee , Knoxville , Tennessee 37996 , United States
| | - Michael O Yokosuk
- Department of Chemistry , University of Tennessee , Knoxville , Tennessee 37996 , United States
| | - Jing Li
- Key Laboratory of Computational Physical Sciences (Ministry of Education), State Key Laboratory of Surface Physics and Department of Physics , Fudan University , Shanghai 200433 , People's Republic of China.,Collaborative Innovation Center of Advanced Microstructures , Nanjing 210093 , People's Republic of China
| | - Nandita Abhyankar
- National High Magnetic Field Laboratory , Tallahassee , Florida 32310 , United States.,Department of Chemistry and Biochemistry , Florida State University , Tallahassee , Florida 32306 , United States
| | - Xiaxin Ding
- National High Magnetic Field Laboratory , Los Alamos National Laboratory , Los Alamos , New Mexico 87545 , United States
| | - Naresh S Dalal
- National High Magnetic Field Laboratory , Tallahassee , Florida 32310 , United States.,Department of Chemistry and Biochemistry , Florida State University , Tallahassee , Florida 32306 , United States
| | - Hongjun Xiang
- Key Laboratory of Computational Physical Sciences (Ministry of Education), State Key Laboratory of Surface Physics and Department of Physics , Fudan University , Shanghai 200433 , People's Republic of China.,Collaborative Innovation Center of Advanced Microstructures , Nanjing 210093 , People's Republic of China
| | - Dmitry Smirnov
- National High Magnetic Field Laboratory , Tallahassee , Florida 32310 , United States
| | - John Singleton
- National High Magnetic Field Laboratory , Los Alamos National Laboratory , Los Alamos , New Mexico 87545 , United States
| | - Janice L Musfeldt
- Department of Chemistry , University of Tennessee , Knoxville , Tennessee 37996 , United States.,Department of Physics , University of Tennessee , Knoxville , Tennessee 37996 , United States
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33
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Ding LJ, Zhong Y. A theoretical insight into an isentropic strategy for enhancing magnetoelectric coupling of organic multiferroics. Phys Chem Chem Phys 2018; 20:20228-20234. [PMID: 30028453 DOI: 10.1039/c8cp03534b] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The cross-coupling between magnetic and ferroelectric orders in spin-driven organic multiferroics provides great potential for realizing multi-state logic memory. Creating strong magnetoelectric coupling around room-temperature is the key to eliminate the main roadblock for practical application. Herein, quantum correlation controlled means are employed to tune the transition temperature TC = 300 K, as the optimal operating temperature. After that, based on the magnetocaloric or electrocaloric effect, a temperature mediated mechanism is proposed to enhance magnetoelectric coupling within an isentropic rather than an isothermal process. Furthermore, a moderate magnetic field combined with a relatively weak electric field can jointly control and dramatically enhance the isentropic magnetoelectric coupling around room-temperature.
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Affiliation(s)
- L J Ding
- Department of Physics, China Three Gorges University, YiChang 443002, China.
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34
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Mandal P, Manna JS, Das D, Maiti R, Mitra MK, Chakravorty D. Magnetic response of chlorophyll self-assembly within hydrogel: a mechanistic approach towards enhanced photoharvesting. RSC Adv 2018; 8:26440-26447. [PMID: 35541073 PMCID: PMC9083083 DOI: 10.1039/c8ra04612c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2018] [Accepted: 07/08/2018] [Indexed: 01/15/2023] Open
Abstract
Self-assembly of chlorophyll-a (Chl-a) molecules within a protein environment serves as the key factor behind controlled and efficient light energy harvesting in natural photosystems. Long-range ordering among supramolecular structures in terms of spin-orbit coupling and edge effect helps in untrapping of excitons in the disordered energy landscape. Mimicking the photosynthetic machinery would give a new paradigm for organic photovoltaic material design where a large amount of disorder exists. In this paper, we report the experimental evidence of room temperature magnetic domain wall formation and edge effect along with spin flop canting in self-assembled Chl-a within hydrogel matrix via SQUID magnetometry. This was further correlated with intermolecular coupling and exciton delocalization through specific arrangements of self-assembly as evident from NMR spectral and photophysical characteristics. The data cumulatively suggest electronic backscattering protection which is also substantiated by the ferroelectric behavior coming from coexisting symmetry lowering. Here the polarization evolves through primary distribution of π electronic density along with a photoresponsive IV loop, similar to the photoprotection of photosynthesis. This work thus proposes a promising design principle for room temperature Chl-a based biomimetic systems efficient in photoharnessing.
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Affiliation(s)
- Pubali Mandal
- School of Materials Science & Nanotechnology, Jadavpur University Kolkata 700032 India
| | - Jhimli S Manna
- School of Materials Science & Nanotechnology, Jadavpur University Kolkata 700032 India
- Department of Electronics & Electrical Communication Engineering, Indian Institute of Technology Kharagpur 721302 India
| | - Debmallya Das
- Department of Materials Science, Indian Association for the Cultivation of Science Kolkata 700032 India
- Metallurgical & Material Engineering Department, Jadavpur University Kolkata 700032 India
| | - Ramaprasad Maiti
- Department of Materials Science, Indian Association for the Cultivation of Science Kolkata 700032 India
- Department of Electronics, Derozio Memorial College Kolkata 700136 India
| | - Manoj K Mitra
- School of Materials Science & Nanotechnology, Jadavpur University Kolkata 700032 India
- Metallurgical & Material Engineering Department, Jadavpur University Kolkata 700032 India
| | - Dipankar Chakravorty
- MLS Professor's Unit, Indian Association for the Cultivation of Science Jadavpur Kolkata 700032 India
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35
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Gati E, Fischer JKH, Lunkenheimer P, Zielke D, Köhler S, Kolb F, von Nidda HAK, Winter SM, Schubert H, Schlueter JA, Jeschke HO, Valentí R, Lang M. Evidence for Electronically Driven Ferroelectricity in a Strongly Correlated Dimerized BEDT-TTF Molecular Conductor. PHYSICAL REVIEW LETTERS 2018; 120:247601. [PMID: 29957011 DOI: 10.1103/physrevlett.120.247601] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Indexed: 06/08/2023]
Abstract
By applying measurements of the dielectric constants and relative length changes to the dimerized molecular conductor κ-(BEDT-TTF)_{2}Hg(SCN)_{2}Cl, we provide evidence for order-disorder type electronic ferroelectricity that is driven by the charge order within the (BEDT-TTF)_{2} dimers and stabilized by a coupling to the anions. According to our density functional theory calculations, this material is characterized by a moderate strength of dimerization. This system thus bridges the gap between strongly dimerized materials, often approximated as dimer-Mott systems at 1/2 filling, and nondimerized or weakly dimerized systems at 1/4 filling, exhibiting a charge order. Our results indicate that intradimer charge degrees of freedom are of particular importance in correlated κ-(BEDT-TTF)_{2}X salts and can create novel states, such as electronically driven multiferroicity or charge-order-induced quasi-one-dimensional spin liquids.
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Affiliation(s)
- Elena Gati
- Institute of Physics, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt am Main, Germany
| | - Jonas K H Fischer
- Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, 86159 Augsburg, Germany
| | - Peter Lunkenheimer
- Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, 86159 Augsburg, Germany
| | - David Zielke
- Institute of Physics, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt am Main, Germany
| | - Sebastian Köhler
- Institute of Physics, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt am Main, Germany
| | - Felizitas Kolb
- Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, 86159 Augsburg, Germany
| | - Hans-Albrecht Krug von Nidda
- Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, 86159 Augsburg, Germany
| | - Stephen M Winter
- Institute for Theoretical Physics, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt am Main, Germany
| | - Harald Schubert
- Institute of Physics, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt am Main, Germany
| | - John A Schlueter
- Division of Materials Research, National Science Foundation, Arlington, Virginia 22230, USA
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - Harald O Jeschke
- Institute for Theoretical Physics, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt am Main, Germany
- Research Institute for Interdisciplinary Science, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan
| | - Roser Valentí
- Institute for Theoretical Physics, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt am Main, Germany
| | - Michael Lang
- Institute of Physics, Goethe-Universität, Max-von-Laue-Straße 1, 60438 Frankfurt am Main, Germany
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36
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Raman Scattering as a Probe of the Magnetic State of BEDT-TTF Based Mott Insulators. CRYSTALS 2018. [DOI: 10.3390/cryst8060233] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Low-Frequency Dynamics of Strongly Correlated Electrons in (BEDT-TTF)2X Studied by Fluctuation Spectroscopy. CRYSTALS 2018. [DOI: 10.3390/cryst8040166] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Fluctuation spectroscopy measurements of quasi-two-dimensional organic charge-transfer salts (BEDT-TTF) 2 X are reviewed. In the past decade, the method has served as a new approach for studying the low-frequency dynamics of strongly correlated charge carriers in these materials. We review some basic aspects of electronic fluctuations in solids, and give an overview of selected problems where the analysis of 1 / f -type fluctuations and the corresponding slow dynamics provide a better understanding of the underlying physics. These examples are related to (1) an inhomogeneous current distribution due to phase separation and/or a percolative transition; (2) slow dynamics due to a glassy freezing either of structural degrees of freedom coupling to the electronic properties or (3) of the electrons themselves, e.g., when residing on a highly-frustrated crystal lattice, where slow and heterogeneous dynamics are key experimental properties for the vitrification process of a supercooled charge-liquid. Another example is (4), the near divergence and critical slowing down of charge carrier fluctuations at the finite-temperature critical endpoint of the Mott metal-insulator transition. Here also indications for a glassy freezing and temporal and spatial correlated dynamics are found. Mapping out the region of ergodicity breaking and understanding the influence of disorder on the temporal and spatial correlated fluctuations will be an important realm of future studies, as well as the fluctuation properties deep in the Mott or charge-ordered insulating states providing a connection to relaxor or ordered ferroelectric states studied by dielectric spectroscopy.
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40
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Poddar S, de Sa P, Cai R, Delannay L, Nysten B, Piraux L, Jonas AM. Room-Temperature Magnetic Switching of the Electric Polarization in Ferroelectric Nanopillars. ACS NANO 2018; 12:576-584. [PMID: 29298391 DOI: 10.1021/acsnano.7b07389] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Magnetoelectric layers with a strong coupling between ferroelectricity and ferromagnetism offer attractive opportunities for the design of new device architectures such as dual-channel memory and multiresponsive sensors and actuators. However, materials in which a magnetic field can switch an electric polarization are extremely rare, work most often only at very low temperatures, and/or comprise complex materials difficult to integrate. Here, we show that magnetostriction and flexoelectricity can be harnessed to strongly couple electric polarization and magnetism in a regularly nanopatterned magnetic metal/ferroelectric polymer layer, to the point that full reversal of the electric polarization can occur at room temperature by the sole application of a magnetic field. Experiments supported by finite element simulations demonstrate that magnetostriction produces large strain gradients at the base of the ferroelectric nanopillars in the magnetoelectric hybrid layer, translating by flexoelectricity into equivalent electric fields larger than the coercive field of the ferroelectric polymer. Our study shows that flexoelectricity can be advantageously used to create a very strong magnetoelectric coupling in a nanopatterned hybrid layer.
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Affiliation(s)
- Shashi Poddar
- Institute of Condensed Matter & Nanosciences, Bio & Soft Matter Université Catholique de Louvain , Louvain-la-Neuve, BE 1348, Belgium
| | - Pedro de Sa
- Institute of Condensed Matter & Nanosciences, Bio & Soft Matter Université Catholique de Louvain , Louvain-la-Neuve, BE 1348, Belgium
| | - Ronggang Cai
- Institute of Condensed Matter & Nanosciences, Bio & Soft Matter Université Catholique de Louvain , Louvain-la-Neuve, BE 1348, Belgium
| | - Laurent Delannay
- Institute of Condensed Matter & Nanosciences, Bio & Soft Matter Université Catholique de Louvain , Louvain-la-Neuve, BE 1348, Belgium
| | - Bernard Nysten
- Institute of Condensed Matter & Nanosciences, Bio & Soft Matter Université Catholique de Louvain , Louvain-la-Neuve, BE 1348, Belgium
| | - Luc Piraux
- Institute of Condensed Matter & Nanosciences, Bio & Soft Matter Université Catholique de Louvain , Louvain-la-Neuve, BE 1348, Belgium
| | - Alain M Jonas
- Institute of Condensed Matter & Nanosciences, Bio & Soft Matter Université Catholique de Louvain , Louvain-la-Neuve, BE 1348, Belgium
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41
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Xu B, Chakraborty H, Yadav VK, Zhang Z, Klein ML, Ren S. Tunable two-dimensional interfacial coupling in molecular heterostructures. Nat Commun 2017; 8:312. [PMID: 28827651 PMCID: PMC5567094 DOI: 10.1038/s41467-017-00390-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2016] [Accepted: 06/24/2017] [Indexed: 11/09/2022] Open
Abstract
Two-dimensional van der Waals heterostructures are of considerable interest for the next generation nanoelectronics because of their unique interlayer coupling and optoelectronic properties. Here, we report a modified Langmuir-Blodgett method to organize two-dimensional molecular charge transfer crystals into arbitrarily and vertically stacked heterostructures, consisting of bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF)/C60 and poly(3-dodecylthiophene-2,5-diyl) (P3DDT)/C60 nanosheets. A strong and anisotropic interfacial coupling between the charge transfer pairs is demonstrated. The van der Waals heterostructures exhibit pressure dependent sensitivity with a high piezoresistance coefficient of -4.4 × 10-6 Pa-1, and conductance and capacitance tunable by external stimuli (ferroelectric field and magnetic field). Density functional theory calculations confirm charge transfer between the n-orbitals of the S atoms in BEDT-TTF of the BEDT-TTF/C60 layer and the π* orbitals of C atoms in C60 of the P3DDT/C60 layer contribute to the inter-complex CT. The two-dimensional molecular van der Waals heterostructures with tunable optical-electronic-magnetic coupling properties are promising for flexible electronic applications.Two-dimensional van der Waals heterostructures are of interest due to their unique interlayer coupling and optoelectronic properties. Here authors develop a Langmuir-Blodgett method to organize charge transfer molecular heterostructures with externally tunable conductance and capacitance and broadband photoresponse.
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Affiliation(s)
- Beibei Xu
- Department of Mechanical Engineering, Temple University, Philadelphia, PA, 19122, USA.,Temple Materials Institute, Temple University, Philadelphia, PA, 19122, USA
| | - Himanshu Chakraborty
- Department of Chemistry and Institute for Computational Molecular Science, Temple University, Philadelphia, PA, 19122, USA.,Center for the Computational Design of Functional Layered Materials, Temple University, Philadelphia,, PA, 19122, USA
| | - Vivek K Yadav
- Department of Chemistry and Institute for Computational Molecular Science, Temple University, Philadelphia, PA, 19122, USA
| | - Zhuolei Zhang
- Department of Mechanical Engineering, Temple University, Philadelphia, PA, 19122, USA.,Temple Materials Institute, Temple University, Philadelphia, PA, 19122, USA
| | - Michael L Klein
- Temple Materials Institute, Temple University, Philadelphia, PA, 19122, USA.,Department of Chemistry and Institute for Computational Molecular Science, Temple University, Philadelphia, PA, 19122, USA
| | - Shenqiang Ren
- Department of Mechanical Engineering, Temple University, Philadelphia, PA, 19122, USA. .,Temple Materials Institute, Temple University, Philadelphia, PA, 19122, USA.
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42
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Conflicting evidence for ferroelectricity. Nature 2017; 547:E9-E10. [DOI: 10.1038/nature22801] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2016] [Accepted: 03/08/2017] [Indexed: 11/09/2022]
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Lee KJ, Xiao Y, Woo JH, Kim E, Kreher D, Attias AJ, Mathevet F, Ribierre JC, Wu JW, André P. Charge-transfer dynamics and nonlocal dielectric permittivity tuned with metamaterial structures as solvent analogues. NATURE MATERIALS 2017; 16:722-729. [PMID: 28581481 DOI: 10.1038/nmat4907] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2015] [Accepted: 04/18/2017] [Indexed: 06/07/2023]
Abstract
Charge transfer (CT) is a fundamental and ubiquitous mechanism in biology, physics and chemistry. Here, we evidence that CT dynamics can be altered by multi-layered hyperbolic metamaterial (HMM) substrates. Taking triphenylene:perylene diimide dyad supramolecular self-assemblies as a model system, we reveal longer-lived CT states in the presence of HMM structures, with both charge separation and recombination characteristic times increased by factors of 2.4 and 1.7-that is, relative variations of 140 and 73%, respectively. To rationalize these experimental results in terms of driving force, we successfully introduce image dipole interactions in Marcus theory. The non-local effect herein demonstrated is directly linked to the number of metal-dielectric pairs, can be formalized in the dielectric permittivity, and is presented as a solid analogue to local solvent polarity effects. This model and extra PH3T:PC60BM results show the generality of this non-local phenomenon and that a wide range of kinetic tailoring opportunities can arise from substrate engineering. This work paves the way toward the design of artificial substrates to control CT dynamics of interest for applications in optoelectronics and chemistry.
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Affiliation(s)
- Kwang Jin Lee
- Department of Physics, CNRS-Ewha International Research Center, Ewha Womans University, Seoul 03760, South Korea
| | - Yiming Xiao
- Department of Physics, CNRS-Ewha International Research Center, Ewha Womans University, Seoul 03760, South Korea
- Sorbonne Universités, UPMC Univ. Paris 06, CNRS, Institut Parisien de Chimie Moléculaire, UMR 8232, Chimie des Polymères, 4 place Jussieu, 75005 Paris, France
| | - Jae Heun Woo
- Department of Physics, CNRS-Ewha International Research Center, Ewha Womans University, Seoul 03760, South Korea
- Center for Length, Division of Physical Metrology, Korea Research Institute of Standards and Science (KRISS), Daejeon 34113, South Korea
| | - Eunsun Kim
- Department of Physics, CNRS-Ewha International Research Center, Ewha Womans University, Seoul 03760, South Korea
| | - David Kreher
- Sorbonne Universités, UPMC Univ. Paris 06, CNRS, Institut Parisien de Chimie Moléculaire, UMR 8232, Chimie des Polymères, 4 place Jussieu, 75005 Paris, France
| | - André-Jean Attias
- Sorbonne Universités, UPMC Univ. Paris 06, CNRS, Institut Parisien de Chimie Moléculaire, UMR 8232, Chimie des Polymères, 4 place Jussieu, 75005 Paris, France
| | - Fabrice Mathevet
- Sorbonne Universités, UPMC Univ. Paris 06, CNRS, Institut Parisien de Chimie Moléculaire, UMR 8232, Chimie des Polymères, 4 place Jussieu, 75005 Paris, France
| | - Jean-Charles Ribierre
- Department of Physics, CNRS-Ewha International Research Center, Ewha Womans University, Seoul 03760, South Korea
| | - Jeong Weon Wu
- Department of Physics, CNRS-Ewha International Research Center, Ewha Womans University, Seoul 03760, South Korea
| | - Pascal André
- Department of Physics, CNRS-Ewha International Research Center, Ewha Womans University, Seoul 03760, South Korea
- RIKEN, Wako, Saitama 351-0198, Japan
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44
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Yang H, Huang Z, Gao Y, Lin H. Room temperature multiferroicity in hydrogenated triapentafulvalene and pentaheptafulvalene oligomers. J Chem Phys 2017; 146:084306. [PMID: 28249414 DOI: 10.1063/1.4976993] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
To search for new organic multiferroics, we perform a systematic study on the magnetic and ferroelectric properties of fused triapentafulvalene and pentaheptafulvalene oligomers (n = 2-6), by using the density functional theory and quantum Monte Carlo method. It is found that the oligomers without hydrogenation always lie in the spin singlet (nonmagnetic) state, while a selective hydrogenation of carbon atoms at the ends of oligomers can result in the spin triplet (ferromagnetic) state, which is tens to hundreds meV lower than the nonmagnetic state. The formation of ferromagnetism can be attributed to the hydrogenation-induced near degeneracy between the highest occupied and lowest unoccupied molecular orbitals. Simultaneously, there exists a finite dipole moment in the ferromagnetic state, due to the breaking of the inversion symmetry of oligomers. Our results imply that the hydrogenated triapentafulvalene and pentaheptafulvalene oligomers could be promising candidates in the development of room temperature organic multiferroics.
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Affiliation(s)
- Hui Yang
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials and Faculty of Physics and Electronic Technology, Hubei University, Wuhan 430062, China
| | - Zhongbing Huang
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials and Faculty of Physics and Electronic Technology, Hubei University, Wuhan 430062, China
| | - Yun Gao
- Faculty of Materials Science and Engineering, Hubei University, Wuhan 430062, China
| | - Haiqing Lin
- Beijing Computational Science Research Center, Beijing 100193, China
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45
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Löhle A, Rose E, Singh S, Beyer R, Tafra E, Ivek T, Zhilyaeva EI, Lyubovskaya RN, Dressel M. Pressure dependence of the metal-insulator transition in κ-(BEDT-TTF) 2Hg(SCN) 2Cl: optical and transport studies. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:055601. [PMID: 27958198 DOI: 10.1088/1361-648x/29/5/055601] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The two-dimensional organic conductor κ-(BEDT-TTF)2-Hg(SCN)2Cl exhibits a pronounced metal-insulator transition at [Formula: see text] K. From the splitting of the molecular vibrations, the phase transition can be unambiguously assigned to charge-ordering with [Formula: see text]. We have investigated the pressure evolution of this behavior by temperature-dependent electrical transport measurements and optical investigations applying hydrostatic pressure up to 12 kbar. The data reveal a mean-field like down-shift of [Formula: see text] with a critical pressure of [Formula: see text] kbar and a metallic state above the suppression of the charge-ordered state; no traces of superconductivity could be identified down to T = 1.5 K. As the charge order [Formula: see text] sets in abruptly with decreasing temperature, its size remains unaffected by pressure. However, the fraction of charge imbalanced molecules decreases until it is completely absent above 1.6 kbar.
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Affiliation(s)
- A Löhle
- Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, D-70550 Stuttgart, Germany
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46
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Cai R, Antohe VA, Hu Z, Nysten B, Piraux L, Jonas AM. Multiferroic Nanopatterned Hybrid Material with Room-Temperature Magnetic Switching of the Electric Polarization. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2017; 29:1604604. [PMID: 27918116 DOI: 10.1002/adma.201604604] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2016] [Revised: 09/22/2016] [Indexed: 06/06/2023]
Abstract
A nanopatterned hybrid layer is designed, wherein the electric polarization can be flipped at room temperature by a magnetic field aided by an electrical field. This is achieved by embedding ferromagnetic nanopillars in a continuous organic ferroelectric layer, and amplifying the magnetostriction-generated stress gradients by scaling down the supracrystalline cell of the material.
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Affiliation(s)
- Ronggang Cai
- Institute of Condensed Matter and Nanosciences, Université catholique de Louvain, Croix du Sud 1/L7.04.02, 1348, Louvain-la-Neuve, Belgium
| | - Vlad-Andrei Antohe
- Institute of Condensed Matter and Nanosciences, Université catholique de Louvain, Croix du Sud 1/L7.04.02, 1348, Louvain-la-Neuve, Belgium
| | - Zhijun Hu
- Center for Soft Condensed Matter Physics and Interdisciplinary Research, Soochow University, 215006, Suzhou, China
| | - Bernard Nysten
- Institute of Condensed Matter and Nanosciences, Université catholique de Louvain, Croix du Sud 1/L7.04.02, 1348, Louvain-la-Neuve, Belgium
| | - Luc Piraux
- Institute of Condensed Matter and Nanosciences, Université catholique de Louvain, Croix du Sud 1/L7.04.02, 1348, Louvain-la-Neuve, Belgium
| | - Alain M Jonas
- Institute of Condensed Matter and Nanosciences, Université catholique de Louvain, Croix du Sud 1/L7.04.02, 1348, Louvain-la-Neuve, Belgium
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47
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Xu B, Chakraborty H, Remsing RC, Klein ML, Ren S. A Free-Standing Molecular Spin-Charge Converter for Ubiquitous Magnetic-Energy Harvesting and Sensing. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2017; 29:1605150. [PMID: 27996176 DOI: 10.1002/adma.201605150] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2016] [Revised: 11/07/2016] [Indexed: 06/06/2023]
Abstract
Magnetic-energy harvesting in a centimeter-sized free-standing (BEDT-TTF)C60 charge-transfer single crystal is demonstrated. The crystal shows sensitive magnetic-, thermal-, and mechanical-sensing ability, with an excellent piezoresistance coefficient of -5.1 × 10-6 Pa-1 . The self-powered sensing performance, together with its solution processability and flexibility, endow it with the capability of driving a new generation of noncontact magnetic-energy harvesting and sensing technologies.
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Affiliation(s)
- Beibei Xu
- Department of Mechanical Engineering and Temple Materials Institute, Temple University, Philadelphia, PA, 19122, USA
| | - Himanshu Chakraborty
- Department of Chemistry and Center for the Computational Design of Functional Layered Materials, Temple University, Philadelphia, PA, 19122, USA
| | - Richard C Remsing
- Department of Chemistry and Center for the Computational Design of Functional Layered Materials, Temple University, Philadelphia, PA, 19122, USA
| | - Michael L Klein
- Department of Chemistry, Center for the Computational Design of Functional Layered Materials, and Temple Materials Institute, Temple University, Philadelphia, PA, 19122, USA
| | - Shenqiang Ren
- Department of Mechanical Engineering and Temple Materials Institute, Temple University, Philadelphia, PA, 19122, USA
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48
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Nakamura I, Tsunashima R, Nishihara S, Inoue K, Akutagawa T. A dielectric anomaly observed for doubly reduced mixed-valence polyoxometalate. Chem Commun (Camb) 2017; 53:6824-6827. [DOI: 10.1039/c7cc03361c] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
A doubly reduced mixed-valence Keggin cluster exhibited a dielectric anomaly that originated from dipole relaxation.
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Affiliation(s)
- Ippei Nakamura
- Graduate School of Science and Engineering
- Yamaguchi University
- Yamaguchi
- Japan
| | - Ryo Tsunashima
- Graduate School of Science and Engineering
- Yamaguchi University
- Yamaguchi
- Japan
| | - Sadafumi Nishihara
- Graduate School of Science
- Hiroshima University
- Higashi-Hiroshima 739-8526
- Japan
- Institute for Advanced Materials Research
| | - Katsuya Inoue
- Graduate School of Science
- Hiroshima University
- Higashi-Hiroshima 739-8526
- Japan
- Institute for Advanced Materials Research
| | - Tomoyuki Akutagawa
- Institute of Multidisciplinary Research for Advanced Materials (IMRAM)
- Tohoku University
- Sendai 980-8577
- Japan
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49
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Gati E, Garst M, Manna RS, Tutsch U, Wolf B, Bartosch L, Schubert H, Sasaki T, Schlueter JA, Lang M. Breakdown of Hooke's law of elasticity at the Mott critical endpoint in an organic conductor. SCIENCE ADVANCES 2016; 2:e1601646. [PMID: 27957540 PMCID: PMC5142797 DOI: 10.1126/sciadv.1601646] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2016] [Accepted: 11/03/2016] [Indexed: 05/27/2023]
Abstract
The Mott metal-insulator transition, a paradigm of strong electron-electron correlations, has been considered as a source of intriguing phenomena. Despite its importance for a wide range of materials, fundamental aspects of the transition, such as its universal properties, are still under debate. We report detailed measurements of relative length changes ΔL/L as a function of continuously controlled helium-gas pressure P for the organic conductor κ-(BEDT-TTF)2Cu[N(CN)2]Cl across the pressure-induced Mott transition. We observe strongly nonlinear variations of ΔL/L with pressure around the Mott critical endpoint, highlighting a breakdown of Hooke's law of elasticity. We assign these nonlinear strain-stress relations to an intimate, nonperturbative coupling of the critical electronic system to the lattice degrees of freedom. Our results are fully consistent with mean-field criticality, predicted for electrons in a compressible lattice with finite shear moduli. We argue that the Mott transition for all systems that are amenable to pressure tuning shows the universal properties of an isostructural solid-solid transition.
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Affiliation(s)
- Elena Gati
- Physikalisches Institut, Goethe-Universität Frankfurt, Max-von-Laue-Straße 1, 60438 Frankfurt am Main, Germany
| | - Markus Garst
- Institut für Theoretische Physik, Universität zu Köln, Zülpicher Straße 77, 50937 Köln, Germany
- Institut für Theoretische Physik, Technische Universität Dresden, Zellescher Weg 17, 01062 Dresden, Germany
| | - Rudra S. Manna
- Physikalisches Institut, Goethe-Universität Frankfurt, Max-von-Laue-Straße 1, 60438 Frankfurt am Main, Germany
| | - Ulrich Tutsch
- Physikalisches Institut, Goethe-Universität Frankfurt, Max-von-Laue-Straße 1, 60438 Frankfurt am Main, Germany
| | - Bernd Wolf
- Physikalisches Institut, Goethe-Universität Frankfurt, Max-von-Laue-Straße 1, 60438 Frankfurt am Main, Germany
| | - Lorenz Bartosch
- Institut für Theoretische Physik, Goethe-Universität Frankfurt, Max-von-Laue-Straße 1, 60438 Frankfurt am Main, Germany
| | - Harald Schubert
- Physikalisches Institut, Goethe-Universität Frankfurt, Max-von-Laue-Straße 1, 60438 Frankfurt am Main, Germany
| | - Takahiko Sasaki
- Institute for Materials Research, Tohoku University, Katahira 2-1-1, Sendai 980-8577, Japan
| | - John A. Schlueter
- Division of Materials Research, National Science Foundation, Arlington, VA 22230, USA
- Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | - Michael Lang
- Physikalisches Institut, Goethe-Universität Frankfurt, Max-von-Laue-Straße 1, 60438 Frankfurt am Main, Germany
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50
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Xu B, Ren S. Integrated Charge Transfer in Organic Ferroelectrics for Flexible Multisensing Materials. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2016; 12:4502-4507. [PMID: 27378088 DOI: 10.1002/smll.201600980] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Revised: 05/31/2016] [Indexed: 06/06/2023]
Abstract
The ultimate or end point of functional materials development is the realization of strong coupling between all energy regimes (optical, electronic, magnetic, and elastic), enabling the same material to be utilized for multifunctionalities. However, the integration of multifunctionalities in soft materials with the existence of various coupling is still in its early stage. Here, the coupling between ferroelectricity and charge transfer by combining bis(ethylenedithio)tetrathiafulvalene-C60 charge-transfer crystals with ferroelectric polyvinylidene fluoride polymer matrix is reported, which enables external stimuli-controlled polarization, optoelectronic and magnetic field sensing properties. Such flexible composite films also display a superior strain-dependent capacitance and resistance change with a giant piezoresistance coefficient of 7.89 × 10(-6) Pa(-1) . This mutual coupled material with the realization of enhanced couplings across these energy domains opens up the potential for multisensing applications.
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Affiliation(s)
- Beibei Xu
- Department of Mechanical Engineering and Temple Materials Institute, Temple University, Philadelphia, PA, 19122, USA
| | - Shenqiang Ren
- Department of Mechanical Engineering and Temple Materials Institute, Temple University, Philadelphia, PA, 19122, USA
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