1
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Guo R, Si R, Li Z, Lin W, Wen B, Gebauer R, Guo S. Stabilization of Short- and Long-Range Magnetic Ordering through the Cooperative Effect of 1D [CuO 4] ∞ Chains and [CuO 2X 2] Quadrilateral in Quasi-1D Spin-1/2 Systems. Angew Chem Int Ed Engl 2024; 63:e202410428. [PMID: 38980962 DOI: 10.1002/anie.202410428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2024] [Revised: 07/04/2024] [Accepted: 07/05/2024] [Indexed: 07/11/2024]
Abstract
Quasi-1D chain antiferromagnets with reduced structural dimensionality are a rich playground for investigating novel quantum phenomena. We report the synthesis, crystal structure, and magnetism of two novel quasi-1D antiferromagnets, β-PbCu2(TeO3)2Cl2 (I) and PbCu2(TeO3)2Br2 (II). Their magnetic frameworks are constructed via Cu-based quasi-1D [Cu(2)O4]∞ zigzag chains with square-planar [Cu(1)O2X2] (X=Cl or Br) separated among 1D chains. Specific heat measurements show λ peaks at ~9 K and ~19 K for I and II, respectively. Moreover, both broad maximums (χmax=90 K for I and 80 K for II) and small kinks (TN≈9 K for I and 19 K for II) have been observed in magnetic susceptibility measurements of I and II. Bonner-Fisher model fitting, and theoretical analyses were performed to evaluate the magnetic exchange interactions. Our experimental and theoretical results and structure-properties relationship analysis reveal the coexistence of short- and long-range magnetic ordering from the cooperative effect of 1D [CuO4]∞ chains and [CuO2X2] quadrilateral.
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Affiliation(s)
- Ruixin Guo
- Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, China
- International Quantum Academy, Shenzhen, 518048, China
| | - Rutong Si
- The Abdus Salam International Centre for Theoretical Physics (ICTP), Strada Costiera 11, 34151, Trieste, Italy
| | - Zhaoyi Li
- Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, China
- International Quantum Academy, Shenzhen, 518048, China
- School of Physics and Electronics, Henan University, Kaifeng, 475004, China
| | - Weijie Lin
- Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, China
- International Quantum Academy, Shenzhen, 518048, China
- School of Physics and Electronics, Henan University, Kaifeng, 475004, China
| | - Bo Wen
- School of Physics and Electronics, Henan University, Kaifeng, 475004, China
| | - Ralph Gebauer
- The Abdus Salam International Centre for Theoretical Physics (ICTP), Strada Costiera 11, 34151, Trieste, Italy
| | - Shu Guo
- Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, China
- International Quantum Academy, Shenzhen, 518048, China
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2
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Yoshimi K, Misawa T, Tsumuraya T, Seo H. Comprehensive Ab Initio Investigation of the Phase Diagram of Quasi-One-Dimensional Molecular Solids. PHYSICAL REVIEW LETTERS 2023; 131:036401. [PMID: 37540876 DOI: 10.1103/physrevlett.131.036401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Revised: 05/23/2023] [Accepted: 05/31/2023] [Indexed: 08/06/2023]
Abstract
An ab initio investigation of the family of molecular compounds TM_{2}X is conducted, where TM is either TMTSF or TMTTF and X takes centrosymmetric monovalent anions. By deriving the extended Hubbard-type Hamiltonians from first-principles band calculations and evaluating not only the intermolecular transfer integrals but also the Coulomb parameters, we discuss their material dependence in the unified phase diagram. Furthermore, we apply the many-variable variational Monte Carlo method to accurately determine the symmetry-breaking phase transitions, and show the development of the charge and spin orderings. We show that the material-dependent parameter can be taken as the correlation effect, represented by the value of the screened on-site Coulomb interaction U relative to the intrachain transfer integrals, for the comprehensive understanding of the spin and charge ordering in this system.
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Affiliation(s)
- Kazuyoshi Yoshimi
- Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - Takahiro Misawa
- Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
- Beijing Academy of Quantum Information Sciences, Haidian District, Beijing 100193, China
| | - Takao Tsumuraya
- Priority Organization for Innovation and Excellence, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan
- Magnesium Research Center, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan
| | - Hitoshi Seo
- Condensed Matter Theory Laboratory, RIKEN, Wako, Saitama 351-0198, Japan
- Center for Emergent Matter Science (CEMS), RIKEN, Wako, Saitama 351-0198, Japan
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3
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Suemune T, Sonoda K, Suzuki S, Sato H, Kusamoto T, Ueda A. Partially Oxidized Purely Organic Zwitterionic Neutral Radical Conductor: Multi-step Phase Transitions and Crossover Caused by Intra- and Intermolecular Electronic Interactions. J Am Chem Soc 2022; 144:21980-21991. [DOI: 10.1021/jacs.2c08813] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Affiliation(s)
- Taro Suemune
- Department of Chemistry, Faculty of Advanced Science and Technology, Kumamoto University, Kumamoto 860-8555, Japan
| | - Keita Sonoda
- Department of Chemistry, Faculty of Advanced Science and Technology, Kumamoto University, Kumamoto 860-8555, Japan
| | - Shuichi Suzuki
- Department of Chemistry, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
| | | | | | - Akira Ueda
- Department of Chemistry, Faculty of Advanced Science and Technology, Kumamoto University, Kumamoto 860-8555, Japan
- International Research Organization for Advanced Science and Technology (IROAST), Kumamoto University, Kumamoto 860-8555, Japan
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4
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A Database for Crystalline Organic Conductors and Superconductors. CRYSTALS 2022. [DOI: 10.3390/cryst12070919] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
We present a prototype database for quasi two-dimensional crystalline organic conductors and superconductors based on molecules related to bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF, ET). The database includes crystal structures, calculated electronic structures, and experimentally measured properties such as the superconducting transition temperature and critical magnetic fields. We obtained crystal structures from the Cambridge Structural Database and created a crystal structure analysis algorithm to identify cation molecules and execute tight binding electronic structure calculations. We used manual data entry to encode experimentally measured properties reported in publications. Crystalline organic conductors and superconductors exhibit a wide variety of electronic ground states, particularly those with correlations. We hope that this database will ultimately lead to a better understanding of the fundamental mechanisms of such states.
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5
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Wakizaka M, Mian MR, Yoshida T, Sato T, Tanaka H, Miyamoto T, Okamoto H, Takaishi S, Iguchi H, Yamashita M. Ni(III) Mott-Hubbard-like State Containing High-Spin Ni(II) in a Semiconductive Bromide-Bridged Ni-Chain Compound. Inorg Chem 2022; 61:9504-9513. [PMID: 35695034 DOI: 10.1021/acs.inorgchem.2c00473] [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
Halogen-bridged linear chain metal complexes (MX-Chains) are fascinating compounds that have a quasi-one-dimensional (1D) electronic system. In this study, we synthesized the first Ni-based MX-Chain compound having hydroxy groups, i.e., [Ni(dabdOH)2Br]Br2·[Ni(dabdOHx)2Br]0.5·(2-PrOH)0.25·(MeOH)0.25 (1·solvent, x = ∼0.6, dabdOH = (2S,3S)-2,3-diaminobutane-1,4-diol). Single-crystal X-ray diffraction revealed that the MX-Chains in 1·solvent formed sheets and single-chain structures in the superlattice. It suggested an MH-like state, whereas the polarized reflection and Raman spectra suggested a CDW-like state. Magnetic and electron spin resonance measurements revealed that both high-spin Ni(II) (∼15%) and low-spin Ni(III) (∼85%) sites are present in the chain structures, i.e., the metal sites show mixed valency. Therefore, we concluded that 1·solvent adopts an intermediate state between the MH and CDW states. Moreover, a single crystal of 1·solvent exhibited semiconductive characteristics along the chain direction. This finding represents a new structural and electronic state of 1D electronic systems as well as MX-Chains.
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Affiliation(s)
- Masanori Wakizaka
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Aoba-Ku, Sendai 980-8578, Japan
| | - Mohammad Rasel Mian
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Aoba-Ku, Sendai 980-8578, Japan
| | - Takefumi Yoshida
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Aoba-Ku, Sendai 980-8578, Japan
| | - Tetsu Sato
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Aoba-Ku, Sendai 980-8578, Japan
| | - Hisaaki Tanaka
- Department of Applied Physics, Graduate School of Engineering, Nagoya University, Chikusa-Ku, Nagoya 464-8603, Japan
| | - Tatsuya Miyamoto
- Department of Advanced Material Science, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
| | - Hiroshi Okamoto
- Department of Advanced Material Science, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan.,AIST-UTokyo Advanced Operando-Measurement Technology Open Innovation Laboratory, National Institute of Advanced Industrial Science and Technology, Chiba 277-8568, Japan
| | - Shinya Takaishi
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Aoba-Ku, Sendai 980-8578, Japan
| | - Hiroaki Iguchi
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Aoba-Ku, Sendai 980-8578, Japan
| | - Masahiro Yamashita
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Aoba-Ku, Sendai 980-8578, Japan.,School of Materials Science and Engineering, Nankai University, Tianjin 300350, P. R. China
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6
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Olejniczak I, Barszcz B, Auban-Senzier P, Jeschke HO, Wojciechowski R, Schlueter JA. Charge-Ordering and Structural Transition in the New Organic Conductor δ'-(BEDT-TTF) 2CF 3CF 2SO 3. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2022; 126:1890-1900. [PMID: 35145572 PMCID: PMC8819691 DOI: 10.1021/acs.jpcc.1c09458] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Revised: 01/11/2022] [Indexed: 06/14/2023]
Abstract
We report structural, transport, and optical properties and electronic structure calculations of the δ'-(BEDT-TTF)2CF3CF2SO3 (BEDT-TTF = bis(ethylenedithio)tetrathiafulvalene) organic conductor that has been synthesized by electrocrystallization. Electronic structure calculations demonstrate the quasi-one-dimensional Fermi surfaces of the compound, while the optical spectra are characteristic for a dimer-Mott insulator. The single-crystal X-ray diffraction measurements reveal the structural phase transition at 200 K from the ambient-temperature monoclinic P21/m phase to the low-temperature orthorhombic Pca21 phase, while the resistivity measurements clearly show the first order semiconductor-semiconductor transition at the same temperature. This transition is accompanied by charge-ordering as it is confirmed by splitting of charge-sensitive vibrational modes observed in the Raman and infrared spectra. The horizontal stripe charge-order pattern is suggested based on the crystal structure, band structure calculations, and optical spectra.
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Affiliation(s)
- Iwona Olejniczak
- Institute
of Molecular Physics, Polish Academy of
Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland
| | - Bolesław Barszcz
- Institute
of Molecular Physics, Polish Academy of
Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland
| | - Pascale Auban-Senzier
- Laboratoire
de Physique des Solides, Université Paris-Saclay, UMR 8502
CNRS, Université Paris-Sud, Orsay 91405, France
| | - Harald O. Jeschke
- Research
Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan
| | - Roman Wojciechowski
- Department
of Molecular Physics, Faculty of Chemistry, Technical University of Łódź, Żeromskiego 116, 90-924 Łódź, Poland
| | - John A. Schlueter
- Materials
Science Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
- Division
of Materials Research, National Science
Foundation, 2415 Eisenhower
Avenue, Alexandria, Virginia 22314, United States
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7
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Kumar A, Banerjee K, Ervasti MM, Kezilebieke S, Dvorak M, Rinke P, Harju A, Liljeroth P. Electronic Characterization of a Charge-Transfer Complex Monolayer on Graphene. ACS NANO 2021; 15:9945-9954. [PMID: 34028269 PMCID: PMC8223480 DOI: 10.1021/acsnano.1c01430] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Accepted: 05/19/2021] [Indexed: 06/12/2023]
Abstract
Organic charge-transfer complexes (CTCs) formed by strong electron acceptor and strong electron donor molecules are known to exhibit exotic effects such as superconductivity and charge density waves. We present a low-temperature scanning tunneling microscopy and spectroscopy (LT-STM/STS) study of a two-dimensional (2D) monolayer CTC of tetrathiafulvalene (TTF) and fluorinated tetracyanoquinodimethane (F4TCNQ), self-assembled on the surface of oxygen-intercalated epitaxial graphene on Ir(111) (G/O/Ir(111)). We confirm the formation of the charge-transfer complex by dI/dV spectroscopy and direct imaging of the singly occupied molecular orbitals. High-resolution spectroscopy reveals a gap at zero bias, suggesting the formation of a correlated ground state at low temperatures. These results point to the possibility to realize and study correlated ground states in charge-transfer complex monolayers on weakly interacting surfaces.
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Affiliation(s)
- Avijit Kumar
- School
of Basic Sciences, Indian Institute of Technology
Bhubaneswar, Jatni, 752050 Khurda, India
- Department
of Applied Physics, Aalto University, FI-00076 Aalto, Finland
| | - Kaustuv Banerjee
- Department
of Applied Physics, Aalto University, FI-00076 Aalto, Finland
| | - Mikko M. Ervasti
- Department
of Applied Physics, Aalto University, FI-00076 Aalto, Finland
| | | | - Marc Dvorak
- Department
of Applied Physics, Aalto University, FI-00076 Aalto, Finland
| | - Patrick Rinke
- Department
of Applied Physics, Aalto University, FI-00076 Aalto, Finland
| | - Ari Harju
- Department
of Applied Physics, Aalto University, FI-00076 Aalto, Finland
- Varian
Medical Systems Finland, FI-00270 Helsinki, Finland
| | - Peter Liljeroth
- Department
of Applied Physics, Aalto University, FI-00076 Aalto, Finland
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8
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Hirata M, Kobayashi A, Berthier C, Kanoda K. Interacting chiral electrons at the 2D Dirac points: a review. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2021; 84:036502. [PMID: 33059346 DOI: 10.1088/1361-6633/abc17c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Accepted: 10/15/2020] [Indexed: 06/11/2023]
Abstract
The pseudo-relativistic chiral electrons in 2D graphene and 3D topological semimetals, known as the massless Dirac or Weyl fermions, constitute various intriguing issues in modern condensed-matter physics. In particular, the issues linked to the Coulomb interaction between the chiral electrons attract great attentions due to their unusual features, namely, the interaction is not screened and has a long-ranged property near the charge-neutrality point, in clear contrast to its screened and short-ranged properties in the conventional correlated materials. In graphene, this long-range interaction induces an anomalous logarithmic renormalization of the Fermi velocity, which causes a nonlinear reshaping of its Dirac cone. In addition, for strong interactions, it even leads to the predictions of an excitonic condensation with a spontaneous mass generation. The interaction, however, would seem to be not that large in graphene, so that the latter phenomenon appears to have not yet been observed. Contrastingly, the interaction is probably large in the pressurized organic materialα-(BEDT-TTF)2I3, where a 2D massless-Dirac-fermion phase emerges next to a correlated insulating phase. Therefore, an excellent testing ground would appear in this material for the studies of both the velocity renormalization and the mass generation, as well as for those of the short-range electronic correlations. In this review, we give an overview of the recent progress on the understanding of such interacting chiral electrons in 2D, by placing particular emphasis on the studies in graphene andα-(BEDT-TTF)2I3. In the first half, we briefly summarize our current experimental and theoretical knowledge about the interaction effects in graphene, then turn attentions to the understanding inα-(BEDT-TTF)2I3, and highlight its relevance to and difference from graphene. The second half of this review focusses on the studies linked to the nuclear magnetic resonance experiments and the associated model calculations inα-(BEDT-TTF)2I3. These studies allow us to discuss the anisotropic reshaping of a tilted Dirac cone together with various electronic correlations, and the precursor excitonic dynamics growing prior to a condensation. We see these provide unique opportunities to resolve the momentum dependence of the spin excitations and fluctuations that are strongly influenced by the long-range interaction near the Dirac points.
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Affiliation(s)
- Michihiro Hirata
- Institute for Materials Research, Tohoku University, Aoba-ku, Sendai 980-8577, Japan
- MPA-Q, Los Alamos National Laboratory, NM 87545, United States of America
| | - Akito Kobayashi
- Department of Physics, Nagoya University, Chikusa-ku, Nagoya 464-8602, Japan
| | - Claude Berthier
- Laboratoire National des Champs Magnétiques Intenses, UPR 3228 CNRS, EMFL, UGA, UPS and INSA, Boite Postale 166, 38042 Grenoble Cedex 9, France
| | - Kazushi Kanoda
- Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
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9
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One-Dimensional Alternating Extended Hubbard Model at Quarter-Filling and Its Applications to Structural Instabilities of Organic Conductors. CRYSTALS 2020. [DOI: 10.3390/cryst10100942] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The one-dimensional extended Hubbard model with lattice dimerization and alternated site potentials is analyzed using the renormalization group method. The coupling of electrons to structural degrees of freedom such as the anion lattice and acoustic phonons is investigated to obtain the possible instabilities against the formation of lattice superstructures. Applications of the theory to anionic and spin-Peierls instabilities in the Fabre and Bechgaard salts series of organic conductors and ordered alloys are presented and discussed.
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10
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Electric Transport of Nodal Line Semimetals in Single-Component Molecular Conductors. CRYSTALS 2020. [DOI: 10.3390/cryst10100862] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
We examine an effect of acoustic phonon scattering on the electric conductivity of a single-component molecular conductor [Pd(dddt)2] (dddt = 5,6-dihydro-1,4-dithiin-2,3-dithiolate) with a half-filled band by applying the previous calculation in a two-dimensional model with Dirac cone [Phys. Rev. B. 98, 161205 (2018)], wherethe electric transport by the impurity scattering exhibits a noticeable interplay of the Dirac cone and the phonon scattering, resulting in maximum of the conductivity with increasing temperature. The conductor shows a nodal line semimetal, where the band crossing of HOMO (Highest Occupied Molecular Orbital) and LUMO (Lowest Unoccupied Molecular Orbital) provides a loop of Dirac points located close to the Fermi energy followed by the density of states (DOS) similar to that of a two-dimensional Dirac cone. Using a tight-binding (TB) model [arXiv:2008.09277], which was obtained using the crystal structure observed from a recent X ray diffraction experiment under pressure, it is shown that the obtained conductivity explains reasonably the anomalous behavior in [Pd(dddt)2] exhibiting temperature-independent resistivity at finite temperatures. This paper demonstrates a crucial role of the acoustic phonon scattering at finite temperatures in the electric conductivity of Dirac electrons. The present theoretical results of conductivity are compared with those of the experiments.
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11
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Santos IC, Gama V, Rabaça S, Veiros LF, Nogueira F, Paixão JA, Almeida M. Structural diversity in conducting bilayer salts (CNB-EDT-TTF) 4A. CrystEngComm 2020. [DOI: 10.1039/d0ce01433h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The family of recently described salts based on the electron donor CNB-EDT-TTF and different anions A, with general formula (CNB-EDT-TTF)4A, constitutes an unprecedented type of molecular conductor based on a bilayer structure of the donors.
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Affiliation(s)
- Isabel C. Santos
- C2TN and DECN
- IST
- Universidade de Lisboa
- 2695-066 Bobadela LRS
- Portugal
| | - Vasco Gama
- C2TN and DECN
- IST
- Universidade de Lisboa
- 2695-066 Bobadela LRS
- Portugal
| | - Sandra Rabaça
- C2TN and DECN
- IST
- Universidade de Lisboa
- 2695-066 Bobadela LRS
- Portugal
| | - Luís F. Veiros
- CQE and DEQ
- IST
- Universidade de Lisboa
- 1049-001, Lisboa
- Portugal
| | - Fernando Nogueira
- CFisUC
- Departamento de Física – Universidade de Coimbra
- Coimbra
- Portugal
| | - José A. Paixão
- CFisUC
- Departamento de Física – Universidade de Coimbra
- Coimbra
- Portugal
| | - Manuel Almeida
- C2TN and DECN
- IST
- Universidade de Lisboa
- 2695-066 Bobadela LRS
- Portugal
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12
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Naka M, Hayami S, Kusunose H, Yanagi Y, Motome Y, Seo H. Spin current generation in organic antiferromagnets. Nat Commun 2019; 10:4305. [PMID: 31541112 PMCID: PMC6754401 DOI: 10.1038/s41467-019-12229-y] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Accepted: 08/22/2019] [Indexed: 11/09/2022] Open
Abstract
Spin current-a flow of electron spins without a charge current-is an ideal information carrier free from Joule heating for electronic devices. The celebrated spin Hall effect, which arises from the relativistic spin-orbit coupling, enables us to generate and detect spin currents in inorganic materials and semiconductors, taking advantage of their constituent heavy atoms. In contrast, organic materials consisting of molecules with light elements have been believed to be unsuited for spin current generation. Here we show that a class of organic antiferromagnets with checker-plate type molecular arrangements can serve as a spin current generator by applying a thermal gradient or an electric field, even with vanishing spin-orbit coupling. Our findings provide another route to create a spin current distinct from the conventional spin Hall effect and open a new field of spintronics based on organic magnets having advantages of small spin scattering and long lifetime.
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Affiliation(s)
- Makoto Naka
- Waseda Institute for Advanced Study, Waseda University, Shinjuku, Tokyo, 169-8050, Japan.
| | - Satoru Hayami
- Department of Physics, Hokkaido University, Sapporo, Hokkaido, 060-0810, Japan
| | - Hiroaki Kusunose
- Department of Physics, Meiji University, Kawasaki, Kanagawa, 214-8571, Japan
| | - Yuki Yanagi
- Institute for Materials Research, Tohoku University, Sendai, Miyagi, 980-8577, Japan
| | - Yukitoshi Motome
- Department of Applied Physics, The University of Tokyo, Bunkyo, Tokyo, 113-8656, Japan
| | - Hitoshi Seo
- Condensed Matter Theory Laboratory, RIKEN, Wako, Saitama, 351-0198, Japan.,Center for Emergent Matter Science (CEMS), RIKEN, Wako, Saitama, 351-0198, Japan
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13
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Mechanism of superconductivity and electron-hole doping asymmetry in κ-type molecular conductors. Nat Commun 2019; 10:3167. [PMID: 31320623 PMCID: PMC6639402 DOI: 10.1038/s41467-019-11022-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2018] [Accepted: 06/13/2019] [Indexed: 11/19/2022] Open
Abstract
Unconventional superconductivity in molecular conductors is observed at the border of metal-insulator transitions in correlated electrons under the influence of geometrical frustration. The symmetry as well as the mechanism of the superconductivity (SC) is highly controversial. To address this issue, we theoretically explore the electronic properties of carrier-doped molecular Mott system κ-(BEDT-TTF)2X. We find significant electron-hole doping asymmetry in the phase diagram where antiferromagnetic (AF) spin order, different patterns of charge order, and SC compete with each other. Hole-doping stabilizes AF phase and promotes SC with dxy-wave symmetry, which has similarities with high-Tc cuprates. In contrast, in the electron-doped side, geometrical frustration destabilizes the AF phase and the enhanced charge correlation induces another SC with extended-s + \documentclass[12pt]{minimal}
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\begin{document}$$d_{x^2 - y^2}$$\end{document}dx2-y2wave symmetry. Our results disclose the mechanism of each phase appearing in filling-control molecular Mott systems, and elucidate how physics of different strongly-correlated electrons are connected, namely, molecular conductors and high-Tc cuprates. The mechanism of unconventional superconductivity in molecular conductors remains controversial. Here, Watanabe et al. theoretically study and report electron-hole doping asymmetry and competing orders with superconductivity in a doped molecular Mott system.
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14
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Song C, Tang J, Li J, Wang Z, Li P, Zhang H. Quantum-Chemical Insights into the Phosphorescence Efficiencies of Blue-Emitting Platinum Complexes with Phenylene-Bridged Pincer Ligands. Inorg Chem 2018; 57:12174-12186. [DOI: 10.1021/acs.inorgchem.8b01828] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Chongping Song
- State Key Laboratory of Supramolecular Structure and Materials, Institute of Theoretical Chemistry, Jilin University, Changchun 130012, P. R. China
| | - Jia Tang
- State Key Laboratory of Supramolecular Structure and Materials, Institute of Theoretical Chemistry, Jilin University, Changchun 130012, P. R. China
| | - Jiaqi Li
- State Key Laboratory of Supramolecular Structure and Materials, Institute of Theoretical Chemistry, Jilin University, Changchun 130012, P. R. China
| | - Zhixiang Wang
- State Key Laboratory of Supramolecular Structure and Materials, Institute of Theoretical Chemistry, Jilin University, Changchun 130012, P. R. China
| | - Ping Li
- State Key Laboratory of Supramolecular Structure and Materials, Institute of Theoretical Chemistry, Jilin University, Changchun 130012, P. R. China
| | - Houyu Zhang
- State Key Laboratory of Supramolecular Structure and Materials, Institute of Theoretical Chemistry, Jilin University, Changchun 130012, P. R. China
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15
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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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16
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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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17
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Optical Conductivity in a Two-Dimensional Extended Hubbard Model for an Organic Dirac Electron System α-(BEDT-TTF)2I3. CRYSTALS 2018. [DOI: 10.3390/cryst8030137] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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18
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Structural and Electronic Properties of (TMTTF)2X Salts with Tetrahedral Anions. CRYSTALS 2018. [DOI: 10.3390/cryst8030121] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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19
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Hahn T, Ludwig T, Timm C, Kortus J. Electronic structure, transport, and collective effects in molecular layered systems. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2017; 8:2094-2105. [PMID: 29090111 PMCID: PMC5647717 DOI: 10.3762/bjnano.8.209] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/10/2017] [Accepted: 09/08/2017] [Indexed: 06/07/2023]
Abstract
The great potential of organic heterostructures for organic device applications is exemplified by the targeted engineering of the electronic properties of phthalocyanine-based systems. The transport properties of two different phthalocyanine systems, a pure copper phthalocyanine (CoPc) and a flourinated copper phthalocyanine-manganese phthalocyanine (F16CoPc/MnPc) heterostructure, are investigated by means of density functional theory (DFT) and the non-equilibrium Green's function (NEGF) approach. Furthermore, a master-equation-based approach is used to include electronic correlations beyond the mean-field-type approximation of DFT. We describe the essential theoretical tools to obtain the parameters needed for the master equation from DFT results. Finally, an interacting molecular monolayer is considered within a master-equation approach.
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Affiliation(s)
- Torsten Hahn
- Institute of Theoretical Physics, TU Freiberg, Leipziger Str. 23, D-09599 Freiberg, Germany
| | - Tim Ludwig
- Institute of Theoretical Physics, Technische Universität Dresden, 01062 Dresden, Germany
| | - Carsten Timm
- Institute of Theoretical Physics, Technische Universität Dresden, 01062 Dresden, Germany
| | - Jens Kortus
- Institute of Theoretical Physics, TU Freiberg, Leipziger Str. 23, D-09599 Freiberg, Germany
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20
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Matsuda M, Iwamura S, Hamada Y, Ohishi H, Nishi M, Nogami Y, Ikeda M, Kanda A, Funasako Y, Mochida T, Nakao A, Hanasaki N. A new strategy for inducing dipole moments in charge-transfer complexes: introduction of asymmetry into axially ligated iron phthalocyanines. Dalton Trans 2017; 46:11800-11805. [PMID: 28831481 DOI: 10.1039/c7dt02605f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Introduction of asymmetry into charge-transfer complexes composed of axially ligated iron phthalocyanines was achieved. In the obtained crystals of TPP[FeIII(Pc)(CN)Cl]2, TPP[FeIII(Pc)(CN)Br]2, and TPP[FeIII(Pc)BrCl]2 (TPP = tetraphenylphosphonium and Pc = phthalocyanine), the axial positions of the iron atoms were occupied by 50/50 ratios of the ligands CN/Cl, CN/Br, and Br/Cl, respectively. The crystal structures of the obtained CT complexes were isostructural to those composed of the symmetric analogues of the type [FeIII(Pc)L2] (L = CN, Cl or Br); the [FeIII(Pc)LL'] units formed regular one-dimensional chains along the c-axis following the symmetry of the P42/n space group. Despite forming similar regular chains to the symmetric systems, the electrical resistivities and activation energies were enhanced in the obtained CT complexes compared to those in symmetric systems, indicating that the charge-ordered states were stabilised by the introduction of asymmetry. More specifically, the dielectric relaxation behaviour of the inhomogeneous disordered TPP[FeIII(Pc)(CN)Cl]2 probably suggests that a dipole moment was induced in this material.
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Affiliation(s)
- Masaki Matsuda
- Department of Chemistry, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 860-8555, Japan.
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21
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Kitou S, Fujii T, Kawamoto T, Katayama N, Maki S, Nishibori E, Sugimoto K, Takata M, Nakamura T, Sawa H. Successive Dimensional Transition in (TMTTF)_{2}PF_{6} Revealed by Synchrotron X-ray Diffraction. PHYSICAL REVIEW LETTERS 2017; 119:065701. [PMID: 28949642 DOI: 10.1103/physrevlett.119.065701] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2017] [Indexed: 06/07/2023]
Abstract
A quasi-one-dimensional organic charge-transfer salt (TMTTF)_{2}PF_{6} undergoes a multistep phase transition as the temperature decreases. One of these transitions is called a "structureless transition," and these detailed structures were unknown for many years. With synchrotron x-ray diffraction, we observed a slight structural difference owing to the effect of charge-order transition between two TMTTF molecules in a dimer, which corresponds to the charge transfer δ_{CO}=0.20e. The two-dimensional Wigner crystallization was determined from an electron density analysis using core differential Fourier synthesis. Furthermore, we found that the ground state due to tetramerization, called the spin Peierls phase, is a three-dimensional transition with interchain correlation.
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Affiliation(s)
- Shunsuke Kitou
- Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan
| | - Tatsuya Fujii
- Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan
| | - Tadashi Kawamoto
- Department of Materials Science and Engineering, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Naoyuki Katayama
- Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan
| | - Sachiko Maki
- Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan
| | - Eiji Nishibori
- Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan
| | - Kunihisa Sugimoto
- Japan Synchrotron Radiation Research Institute (JASRI), SPring-8, Hyogo 679-5198, Japan
| | - Masaki Takata
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
| | | | - Hiroshi Sawa
- Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan
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22
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Voloshenko I, Herter M, Beyer R, Pustogow A, Dressel M. Pressure-dependent optical investigations of Fabre salts in the charge-ordered state. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:115601. [PMID: 28170352 DOI: 10.1088/1361-648x/aa579c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
In a comprehensive infrared study, the molecular vibrational features of (TMTTF)2SbF6, (TMTTF)2AsF6 and (TMTTF)2PF6 single crystals have been measured down to temperatures as low as 7 K by applying hydrostatic pressure up to 11 kbar. We follow the charge disproportionation below the critical temperatures T CO as pressure increases, and determine the critical pressure values p CO at which the charge-ordered phase is suppressed. The coexistence of the spin-Peierls phase with charge order is explored at low temperatures, and the competition of these two phases is observed. Based on our measurements we construct a generic phase diagram of the Fabre salts with centrosymmetric anions. The pressure-dependent anion and methyl-group dynamics in these quasi-one-dimensional charge transfer compounds yields information about the interplay of the organic molecules in the stacks and the anions, and how this interaction varies upon the transition to the charge-ordered state.
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Affiliation(s)
- Ievgen Voloshenko
- Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany
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23
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Higashino T, Ueda A, Yoshida J, Mori H. Improved stability of a metallic state in benzothienobenzothiophene-based molecular conductors: an effective increase of dimensionality with hydrogen bonds. Chem Commun (Camb) 2017; 53:3426-3429. [PMID: 28239694 DOI: 10.1039/c7cc00784a] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
A dihydroxy-substituted benzothienobenzothiophene, BTBT(OH)2, was synthesized, and its charge-transfer (CT) salt, β-[BTBT(OH)2]2ClO4, was successfully obtained. Thanks to the introduced hydroxy groups, a hydrogen-bonded chain structure connecting the BTBT molecules and counter anions was formed in the CT salt, which effectively increases the dimensionality of the electronic structure and consequently leads to a stable metallic state.
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Affiliation(s)
- Toshiki Higashino
- The Institute for Solid State Physics, The University of Tokyo, Kashiwanoha, Kashiwa, Chiba 277-8581, Japan.
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24
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Matsuda M, Yoshida G, Yamaura JI, Inabe T, Tajima H. The magnetoresistance effect in a conducting molecular crystal consisting of dicyano(phthalocyaninato)manganese(iii). Dalton Trans 2017; 46:1892-1897. [PMID: 28106221 DOI: 10.1039/c6dt04481f] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A conducting molecular crystal TPP[MnIII(Pc)(CN)2]2 (MnIII: d4, S = 1, TPP = tetraphenylphosphonium and Pc = phthalocyanine) was fabricated. In its crystal structure, the [MnIII(Pc)(CN)2] units formed a one-dimensional regular chain along the c-axis with an overlap integral value of 8.6 × 10-3. TPP[MnIII(Pc)(CN)2]2 showed a semiconducting behaviour that also has been observed for isostructural TPP[CoIII(Pc)(CN)2]2 (CoIII: d6, S = 0) and TPP[FeIII(Pc)(CN)2]2 (FeIII: d5, S = 1/2) whose ground states are charge-ordered states. In spite of the local magnetic moment of the MnIII ion (S = 1) at the centre of the Pc ligand, TPP[MnIII(Pc)(CN)2]2 exhibited an almost isotropic and small negative magnetoresistance (MR) effect (the MR ratio was -8.7% under 8 T at 10.7 K), contrarily to the anisotropic giant negative MR effect of TPP[FeIII(Pc)(CN)2]2. The isotropy was found to be due to a (dxz)1(dyz)1 electronic configuration, and the smaller MR effect was explained by a weaker antiferromagnetic interaction between MnIII ions than that between FeIII ions, as suggested by a Weiss temperature Θ of -3.1 K (|Jdd|/kB = 1.2 K).
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Affiliation(s)
- Masaki Matsuda
- Institute for Solid State Physics, the University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa 277-8581, Japan
| | - Gosuke Yoshida
- Institute for Solid State Physics, the University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa 277-8581, Japan
| | - Jun-Ichi Yamaura
- Institute for Solid State Physics, the University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa 277-8581, Japan
| | - Tamotsu Inabe
- Department of Chemistry, Hokkaido University, Kita 10 Nishi 8, Kita-ku, Sapporo 060-0810, Japan
| | - Hiroyuki Tajima
- Institute for Solid State Physics, the University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa 277-8581, Japan
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25
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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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26
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Nishi M, Ikeda M, Kanda A, Hanasaki N, Hoshino N, Akutagawa T, Matsuda M. A giant negative magnetoresistance effect in an iron tetrabenzoporphyrin complex. Dalton Trans 2016; 45:16604-16609. [PMID: 27477610 DOI: 10.1039/c6dt01911k] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
By measuring the electrical resistivity in TPP[FeIII(tbp)(CN)2]2 (TPP = tetraphenylphosphonium and tbp = tetrabenzoporphyrin) under the application of a static magnetic field, a giant negative magnetoresistance (MR) effect with high anisotropy is observed. More specifically, the MR ratio at 13 K under a field of 9 T perpendicular to the c axis is -70%, whereas the MR ratio under a field parallel to the c axis is -40%. Furthermore, electron spin resonance (ESR) measurements indicate large anisotropy in the principal g-values of d spin (S = 1/2) in the [FeIII(tbp)(CN)2] unit; the g1 value almost perpendicular to the tbp plane and the g2 and g3 values almost parallel to the tbp plane are 3.60, 1.24, and 0.39, respectively. It is revealed that the anisotropy in the MR effect arises from the anisotropy in the d spin, suggesting that the d spins in TPP[FeIII(tbp)(CN)2]2 affect the π-conduction electron via the intramolecular π-d interaction. The anisotropy and magnitude in the giant negative MR effect for TPP[FeIII(tbp)(CN)2]2 are smaller than the corresponding values for the isostructural phthalocyanine (Pc) analogue TPP[FeIII(Pc)(CN)2]2. This is consistent with the fact that the intermolecular antiferromagnetic d-d interaction in TPP[FeIII(tbp)(CN)2]2 (suggested by the Weiss temperature: Θ = -8.0 K) is weaker than that in TPP[FeIII(Pc)(CN)2]2 (Θ = -12.3 K). This indicates that the minor modification in coordination complexes can significantly affect the MR effect via tuning the intermolecular d-d interaction as well as the intermolecular π-π overlap.
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Affiliation(s)
- Miki Nishi
- Department of Chemistry, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 860-8555, Japan.
| | - Mitsuo Ikeda
- Department of Physics, Osaka University, 1-1 Machikaneyama, Toyonaka 560-0043, Japan
| | - Akinori Kanda
- Department of Physics, Osaka University, 1-1 Machikaneyama, Toyonaka 560-0043, Japan
| | - Noriaki Hanasaki
- Department of Physics, Osaka University, 1-1 Machikaneyama, Toyonaka 560-0043, Japan
| | - Norihisa Hoshino
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Sendai 980-8577, Japan
| | - Tomoyuki Akutagawa
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Sendai 980-8577, Japan
| | - Masaki Matsuda
- Department of Chemistry, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 860-8555, Japan.
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27
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Rabaça S, Oliveira S, Santos IC, Gama V, Belo D, Lopes EB, Canadell E, Almeida M. Polymorphism and Superconductivity in Bilayer Molecular Metals (CNB-EDT-TTF) 4I 3. Inorg Chem 2016; 55:10343-10350. [PMID: 27681055 DOI: 10.1021/acs.inorgchem.6b01555] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Electrocrystallization from solutions of the dissymmetrical ET derivative cyanobenzene-ethylenedithio-tetrathiafulvalene (CNB-EDT-TTF) in the presence of triiodide I3- affords two different polymorphs (β″ and κ) with the composition (CNB-EDT-TTF)4I3, both with a bilayer structure of the donors. These polymorphs differ in the packing patterns (β″- and κ-type) of the donor molecules in each layer, in both cases with bifurcated C-N···H interactions effectively coupling head-to-head donor molecules between layer pairs. Two β″ polymorphs can be obtained with different degrees of anionic ordering. In one disordered phase, β″d, with a smaller unit cell, the triiodide anions are disordered over two possible positions in a channel between the donor bilayers, while in the ordered phase, β″o, the triiodide anions occupy only one of those positions in this channel, leading to the doubling of the unit cell in the layer plane. These results for β″ phases contrast with the κ polymorph previously reported, for which weaker disorder of the triiodide anions, over two possible orientations with 94 and 6% occupation factors, was observed. While the β″ polymorphs remains metallic down to 1.5 K with a ρ300K/ρ4K resistivity ratio of 250, the κ polymorph presents a much smaller resistivity ratio in the range of 4-10 and superconductivity with an onset temperature of 3.5 K.
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Affiliation(s)
- Sandra Rabaça
- C2TN, Instituto Superior Técnico, Universidade de Lisboa Estrada Nacional 10 , P-2695-066 Bobadela LRS, Portugal
| | - Sandrina Oliveira
- C2TN, Instituto Superior Técnico, Universidade de Lisboa Estrada Nacional 10 , P-2695-066 Bobadela LRS, Portugal
| | - Isabel C Santos
- C2TN, Instituto Superior Técnico, Universidade de Lisboa Estrada Nacional 10 , P-2695-066 Bobadela LRS, Portugal.,CQE, Instituto Superior Técnico, Universidade de Lisboa Av. Rovisco Pais , P-1049-001 Lisboa, Portugal
| | - Vasco Gama
- C2TN, Instituto Superior Técnico, Universidade de Lisboa Estrada Nacional 10 , P-2695-066 Bobadela LRS, Portugal
| | - Dulce Belo
- C2TN, Instituto Superior Técnico, Universidade de Lisboa Estrada Nacional 10 , P-2695-066 Bobadela LRS, Portugal
| | - Elsa B Lopes
- C2TN, Instituto Superior Técnico, Universidade de Lisboa Estrada Nacional 10 , P-2695-066 Bobadela LRS, Portugal
| | - Enric Canadell
- Institut de Ciencia de Materials de Barcelona (ICMAB-CSIC) , Campus UAB, E-08193 Bellaterra, Spain
| | - Manuel Almeida
- C2TN, Instituto Superior Técnico, Universidade de Lisboa Estrada Nacional 10 , P-2695-066 Bobadela LRS, Portugal
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28
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Hirata M, Ishikawa K, Miyagawa K, Tamura M, Berthier C, Basko D, Kobayashi A, Matsuno G, Kanoda K. Observation of an anisotropic Dirac cone reshaping and ferrimagnetic spin polarization in an organic conductor. Nat Commun 2016; 7:12666. [PMID: 27578363 PMCID: PMC5013692 DOI: 10.1038/ncomms12666] [Citation(s) in RCA: 100] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2015] [Accepted: 07/21/2016] [Indexed: 11/27/2022] Open
Abstract
The Coulomb interaction among massless Dirac fermions in graphene is unscreened around the isotropic Dirac points, causing a logarithmic velocity renormalization and a cone reshaping. In less symmetric Dirac materials possessing anisotropic cones with tilted axes, the Coulomb interaction can provide still more exotic phenomena, which have not been experimentally unveiled yet. Here, using site-selective nuclear magnetic resonance, we find a non-uniform cone reshaping accompanied by a bandwidth reduction and an emergent ferrimagnetism in tilted Dirac cones that appear on the verge of charge ordering in an organic compound. Our theoretical analyses based on the renormalization-group approach and the Hubbard model show that these observations are the direct consequences of the long-range and short-range parts of the Coulomb interaction, respectively. The cone reshaping and the bandwidth renormalization, as well as the magnetic behaviour revealed here, can be ubiquitous and vital for many Dirac materials.
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Affiliation(s)
- Michihiro Hirata
- Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
- Laboratoire National des Champs Magnétiques Intenses, UPR 3228 CNRS, EMFL, UGA, UPS and INSA, Boite Postale 166, Grenoble, Cedex 9 38042, France
| | - Kyohei Ishikawa
- Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Kazuya Miyagawa
- Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Masafumi Tamura
- Department of Physics, Faculty of Science and Technology, Tokyo University of Science, Noda, Chiba 278-8510, Japan
| | - Claude Berthier
- Laboratoire National des Champs Magnétiques Intenses, UPR 3228 CNRS, EMFL, UGA, UPS and INSA, Boite Postale 166, Grenoble, Cedex 9 38042, France
| | - Denis Basko
- Université Grenoble Alpes and CNRS, Laboratoire de Physique et Modélisation des Milieux Condensés UMR 5493, 25 rue des Martyrs, Grenoble 38042, France
| | - Akito Kobayashi
- Department of Physics, Nagoya University, Chikusa-ku, Nagoya 464-8602, Japan
| | - Genki Matsuno
- Department of Physics, Nagoya University, Chikusa-ku, Nagoya 464-8602, Japan
| | - Kazushi Kanoda
- Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
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29
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Siles PF, Hahn T, Salvan G, Knupfer M, Zhu F, Zahn DRT, Schmidt OG. Tunable charge transfer properties in metal-phthalocyanine heterojunctions. NANOSCALE 2016; 8:8607-8617. [PMID: 27049842 DOI: 10.1039/c5nr08671j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Organic materials such as phthalocyanine-based systems present a great potential for organic device applications due to the possibility of integrating films of different organic materials to create organic heterostructures which combine the electrical capabilities of each material. This opens the possibility to precisely engineer and tune new electrical properties. In particular, similar transition metal phthalocyanines demonstrate hybridization and charge transfer properties which could lead to interesting physical phenomena. Although, when considering device dimensions, a better understanding and control of the tuning of the transport properties still remain in the focus of research. Here, by employing conductive atomic force microscopy techniques, we provide an insight about the nanoscale electrical properties and transport mechanisms of MnPc and fluorinated phthalocyanines such as F16CuPc and F16CoPc. We report a transition from typical diode-like transport mechanisms for pure MnPc thin films to space-charge-limited current transport regime (SCLC) for Pc-based heterostructures. The controlled addition of fluorinated phthalocyanine also provides highly uniform and symmetric-polarized transport characteristics with conductance enhancements up to two orders of magnitude depending on the polarization. We present a method to spatially map the mobility of the MnPc/F16CuPc structures with a nanoscale resolution and provide theoretical calculations to support our experimental findings. This well-controlled nanoscale tuning of the electrical properties for metal transition phthalocyanine junctions stands as key step for future phthalocyanine-based electronic devices, where the low dimension charge transfer, mediated by transition metal atoms could be intrinsically linked to a transfer of magnetic moment or spin.
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Affiliation(s)
- P F Siles
- Material Systems for Nanoelectronics, Technische Universität Chemnitz, 09107 Chemnitz, Germany. and Institute for Integrative Nanosciences, IFW Dresden, 01069 Dresden, Germany
| | - T Hahn
- Institute of Theoretical Physics, TU Bergakademie Freiberg, 09696 Freiberg, Germany
| | - G Salvan
- Semiconductor Physics, Technische Universität Chemnitz, 09107 Chemnitz, Germany
| | - M Knupfer
- Institute for Integrative Nanosciences, IFW Dresden, 01069 Dresden, Germany
| | - F Zhu
- Material Systems for Nanoelectronics, Technische Universität Chemnitz, 09107 Chemnitz, Germany. and Institute for Integrative Nanosciences, IFW Dresden, 01069 Dresden, Germany
| | - D R T Zahn
- Semiconductor Physics, Technische Universität Chemnitz, 09107 Chemnitz, Germany and Center for Advancing Electronics Dresden (cfAED), TU Dresden, 01062 Dresden, Germany and Faculty of Mechanical Engineering, Cluster of Excellence MERGE, Technische Universität Chemnitz, 09107 Chemnitz, Germany
| | - O G Schmidt
- Material Systems for Nanoelectronics, Technische Universität Chemnitz, 09107 Chemnitz, Germany. and Institute for Integrative Nanosciences, IFW Dresden, 01069 Dresden, Germany and Center for Advancing Electronics Dresden (cfAED), TU Dresden, 01062 Dresden, Germany and Faculty of Mechanical Engineering, Cluster of Excellence MERGE, Technische Universität Chemnitz, 09107 Chemnitz, Germany
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30
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Kiyota Y, Kadoya T, Yamamoto K, Iijima K, Higashino T, Kawamoto T, Takimiya K, Mori T. Benzothienobenzothiophene-Based Molecular Conductors: High Conductivity, Large Thermoelectric Power Factor, and One-Dimensional Instability. J Am Chem Soc 2016; 138:3920-5. [DOI: 10.1021/jacs.6b01213] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yasuhiro Kiyota
- Department
of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama 2-12-1, Meguro-ku, Tokyo 152-8552, Japan
| | - Tomofumi Kadoya
- Department
of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama 2-12-1, Meguro-ku, Tokyo 152-8552, Japan
| | - Kaoru Yamamoto
- Department
of Applied Physics, Okayama University of Science, Ridaicho 1-1, Okayama 700-0005, Japan
| | - Kodai Iijima
- Department
of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama 2-12-1, Meguro-ku, Tokyo 152-8552, Japan
| | - Toshiki Higashino
- Department
of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama 2-12-1, Meguro-ku, Tokyo 152-8552, Japan
| | - Tadashi Kawamoto
- Department
of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama 2-12-1, Meguro-ku, Tokyo 152-8552, Japan
| | - Kazuo Takimiya
- Emergent
Molecular Function Research Group, RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan
| | - Takehiko Mori
- Department
of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama 2-12-1, Meguro-ku, Tokyo 152-8552, Japan
- ACT-C, JST, Honcho, Kawaguchi,
Saitama 332-0012, Japan
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31
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Naka M, Ishihara S. Magnetoelectric effect in organic molecular solids. Sci Rep 2016; 6:20781. [PMID: 26876424 PMCID: PMC4753515 DOI: 10.1038/srep20781] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2015] [Accepted: 01/12/2016] [Indexed: 11/09/2022] Open
Abstract
The Magnetoelectric (ME) effect in solids is a prominent cross correlation phenomenon, in which the electric field (E) controls the magnetization (M) and the magnetic field (H) controls the electric polarization (P). A rich variety of ME effects and their potential in practical applications have been investigated so far within the transition-metal compounds. Here, we report a possible way to realize the ME effect in organic molecular solids, in which two molecules build a dimer unit aligned on a lattice site. The linear ME effect is predicted in a long-range ordered state of spins and electric dipoles, as well as in a disordered state. One key of the ME effect is a hidden ferroic order of the spin-charge composite object. We provide a new guiding principle of the ME effect in materials without transition-metal elements, which may lead to flexible and lightweight multifunctional materials.
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Affiliation(s)
- Makoto Naka
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - Sumio Ishihara
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
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32
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Jeannin O, Canadell E, Auban-Senzier P, Fourmigué M. Correlating conduction properties with the molecular symmetry: segregation of Z and E isomers in the charge-assisted, halogen-bonded cocrystal [(Z,E)-Me2I2TTF]2Br. Chem Commun (Camb) 2016; 52:308-11. [DOI: 10.1039/c5cc08176a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Co-crystallization of theZandEisomers of Me2I2TTF in a mixed-valence bromide salt leads to segregated stacks with two different charge order patterns and associated charge-assisted halogen bonding.
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Affiliation(s)
- Olivier Jeannin
- Institut des Sciences Chimiques de Rennes
- Université Rennes 1
- UMR CNRS 6226
- 35042 Rennes
- France
| | - Enric Canadell
- Institut de Ciència de Materials de Barcelona (CSIC)
- E-08193 Bellaterra
- Spain
| | - Pascale Auban-Senzier
- Laboratoire de Physique des Solides
- Université Paris-Sud
- UMR CNRS 8502
- 91405 Orsay
- France
| | - Marc Fourmigué
- Institut des Sciences Chimiques de Rennes
- Université Rennes 1
- UMR CNRS 6226
- 35042 Rennes
- France
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33
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Kanibolotsky AL, Findlay NJ, Skabara PJ. Polythiophene and oligothiophene systems modified by TTF electroactive units for organic electronics. Beilstein J Org Chem 2015; 11:1749-66. [PMID: 26664595 PMCID: PMC4660975 DOI: 10.3762/bjoc.11.191] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2015] [Accepted: 08/30/2015] [Indexed: 11/23/2022] Open
Abstract
The aim of this review is to give an update on current progress in the synthesis, properties and applications of thiophene-based conjugated systems bearing tetrathiafulvalene (TTF) units. We focus mostly on the synthesis of poly- and oligothiophenes with TTF moieties fused to the thiophene units of the conjugated backbone either directly or via a dithiin ring. The electrochemical behaviour of these materials and structure-property relationships are discussed. The study is directed towards the development of a new type of organic semiconductors based on these hybrid materials for application in organic field effect transistors and solar cells.
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Affiliation(s)
- Alexander L Kanibolotsky
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow, G1 1XL, United Kingdom ; Institute of Physical-Organic Chemistry and Coal Chemistry, 02160 Kyiv, Ukraine
| | - Neil J Findlay
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow, G1 1XL, United Kingdom
| | - Peter J Skabara
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow, G1 1XL, United Kingdom
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34
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Rury AS, Sorenson S, Driscoll E, Dawlaty JM. Electronic State-Resolved Electron-Phonon Coupling in an Organic Charge Transfer Material from Broadband Quantum Beat Spectroscopy. J Phys Chem Lett 2015; 6:3560-3564. [PMID: 26722724 DOI: 10.1021/acs.jpclett.5b01706] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The coupling of electron and lattice phonon motion plays a fundamental role in the properties of functional organic charge-transfer materials. In this Letter we extend the use of ultrafast vibrational quantum beat spectroscopy to directly elucidate electron-phonon coupling in an organic charge-transfer material. As a case study, we compare the oscillatory components of the transient reflection (TR) of a broadband probe pulse from single crystals of quinhydrone, a 1:1 cocrystal of hydroquinone and p-benzoquinone, after exciting nonresonant impulsive stimulated Raman scattering and resonant electronic transitions using ultrafast pulses. Spontaneous resonance Raman spectra confirm the assignment of these oscillations as coherent lattice phonon excitations. Fourier transforms of the vibrational quantum beats in our broadband TR measurements allow construction of spectra that we show report the ability of these phonons to directly modulate the electronic structure of quinhydrone. These results demonstrate how coherent ultrafast processes can characterize the complex interplay of charge transfer and lattice motion in materials of fundamental relevance to chemistry, materials sciences, and condensed matter physics.
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Affiliation(s)
- Aaron S Rury
- Department of Chemistry, University of Southern California , Los Angeles, California 90089, United States
| | - Shayne Sorenson
- Department of Chemistry, University of Southern California , Los Angeles, California 90089, United States
| | - Eric Driscoll
- Department of Chemistry, University of Southern California , Los Angeles, California 90089, United States
| | - Jahan M Dawlaty
- Department of Chemistry, University of Southern California , Los Angeles, California 90089, United States
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35
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Oliveira S, Ministro J, Santos IC, Belo D, Lopes EB, Rabaça S, Canadell E, Almeida M. Bilayer Molecular Metals Based on Dissymmetrical Electron Donors. Inorg Chem 2015; 54:6677-9. [PMID: 26125110 DOI: 10.1021/acs.inorgchem.5b01240] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The electrocrystallization from solutions of cyanobenzene-ethylenedithio-tetrathiafulvalene (CNB-EDT-TTF) in the presence of different anions X = ClO4(-), PF6(-), and I3(-), affords a new type of 2D molecular metals with composition (CNB-EDT-TTF)4X based on an unprecedented bilayer structure of the donors induced by effective head to head interdonor interactions through the nitrile groups, which is responsible for 2D metallic systems with unusual properties such as the higher band filling, larger effective mass of carriers, and almost degenerated double Fermi surfaces.
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Affiliation(s)
- Sandrina Oliveira
- †C2TN, Instituto Superior Técnico, Universidade de Lisboa, Estrada Nacional 10, P-2695-066 Bobadela LRS, Portugal
| | - José Ministro
- †C2TN, Instituto Superior Técnico, Universidade de Lisboa, Estrada Nacional 10, P-2695-066 Bobadela LRS, Portugal
| | - Isabel C Santos
- †C2TN, Instituto Superior Técnico, Universidade de Lisboa, Estrada Nacional 10, P-2695-066 Bobadela LRS, Portugal
| | - Dulce Belo
- †C2TN, Instituto Superior Técnico, Universidade de Lisboa, Estrada Nacional 10, P-2695-066 Bobadela LRS, Portugal
| | - Elsa B Lopes
- †C2TN, Instituto Superior Técnico, Universidade de Lisboa, Estrada Nacional 10, P-2695-066 Bobadela LRS, Portugal
| | - Sandra Rabaça
- †C2TN, Instituto Superior Técnico, Universidade de Lisboa, Estrada Nacional 10, P-2695-066 Bobadela LRS, Portugal
| | - Enric Canadell
- ‡Institut de Ciencia de Materials de Barcelona (ICMAB-CSIC), Campus UAB, E-08193 Bellaterra, Spain
| | - Manuel Almeida
- †C2TN, Instituto Superior Técnico, Universidade de Lisboa, Estrada Nacional 10, P-2695-066 Bobadela LRS, Portugal
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36
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Starykh OA. Unusual ordered phases of highly frustrated magnets: a review. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2015; 78:052502. [PMID: 25892088 DOI: 10.1088/0034-4885/78/5/052502] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We review ground states and excitations of a quantum antiferromagnet on triangular and other frustrated lattices. We pay special attention to the combined effects of magnetic field h, spatial anisotropy R and spin magnitude S. The focus of the review is on the novel collinear spin density wave and spin nematic states, which are characterized by fully gapped transverse spin excitations with S(z) = ± 1. We discuss extensively the R - h phase diagram of the antiferromagnet, both in the large-S semiclassical limit and the quantum S = 1/2 limit. When possible, we point out connections with experimental findings.
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Affiliation(s)
- Oleg A Starykh
- Department of Physics and Astronomy, University of Utah, Salt Lake City, UT 84112-0830, USA
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37
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Butler MR, Movaghar B, Marks TJ, Ratner MA. Electron pairing in designer materials: a novel strategy for a negative effective Hubbard U. NANO LETTERS 2015; 15:1597-1602. [PMID: 25615444 DOI: 10.1021/nl5041176] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We propose a set of design rules with a model Hamiltonian that allows electrons to form attracting pairs through the exploitation of a new combination of resonant band alignment and Coulombic repulsion. The pair bands and single particle bands in various lattices are calculated and compared in energy, and regions of net attraction are identified. This work provides guidelines for the construction of molecular systems, nanocrystals, and nanoparticle arrays with the potential for superconductivity.
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Affiliation(s)
- Melanie R Butler
- Department of Chemistry and the Materials Research Center, Northwestern University , Evanston, Illinois 60208, United States
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38
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Onda K, Yamochi H, Koshihara SY. Diverse photoinduced dynamics in an organic charge-transfer complex having strong electron-phonon interactions. Acc Chem Res 2014; 47:3494-503. [PMID: 25340327 DOI: 10.1021/ar500257b] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
CONSPECTUS: Phenomena that occur in nonequilibrium states created by photoexcitation differ qualitatively from those that occur at thermal equilibrium, and various physical theories developed for thermal equilibrium states can hardly be applied to such phenomena. Recently it has been realized that understanding phenomena in nonequilibrium states in solids is important for photoenergy usage and ultrafast computing. Consequently, much effort has been devoted to revealing such phenomena by developing various ultrafast observation techniques and theories applicable to nonequilibrium states. This Account describes our recent studies of diverse photoinduced dynamics in a strongly correlated organic solid using various ultrafast techniques. Solids in which the electronic behavior is affected by Coulomb interactions between electrons are designated as strongly correlated materials and are known to exhibit unique physical properties even at thermal equilibrium. Among them, many organic charge-transfer (CT) complexes have low dimensionality and flexibility in addition to strong correlations; thus, their physical properties change sensitively in response to changes in pressure or electric field. Photoexcitation is also expected to drastically change their physical properties and would be useful for ultrafast photoswitching devices. However, in nonequilibrium states, the complicated dynamics due to these characteristics prevents us from understanding and using these materials for photonic devices. The CT complex (EDO-TTF)2PF6 (EDO-TTF = 4,5-ethylenedioxytetrathiafulvalene) exhibits unique photoinduced dynamics due to strong electron-electron and electron-phonon interactions. We have performed detailed studies of the dynamics of this complex using transient electronic spectroscopy at the 10 and 100 fs time scales. These studies include transient vibrational spectroscopy, which is sensitive to the charges and structures of constituent molecules, and transient electron diffraction, which provides direct information on the crystal structure. Photoexcitation of the charge-ordered low-temperature phase of (EDO-TTF)2PF6 creates a new photoinduced phase over 40 fs via the Franck-Condon state, in which electrons and vibrations are coherently and strongly coupled. This new photoinduced phase is assigned to an insulator-like state in which the charge order differs from that of the initial state. In the photoinduced phase, translations of component molecules proceed before the rearrangements of intramolecular conformations. Subsequently, the charge order and structure gradually approach those of the high-temperature phase over 100 ps. This unusual two-step photoinduced phase transition presumably originates from steric effects due to the bent EDO-TTF as well as strong electron-lattice interactions.
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Affiliation(s)
- Ken Onda
- Interactive
Research Center of Science, Tokyo Institute of Technology, Nagatsuta, Midori-ku, Yokohama, Kanagawa 226-8502, Japan
- PRESTO, Japan Science and Technology Agency (JST), 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
| | - Hideki Yamochi
- Research
Center for Low Temperature and Materials Sciences, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - Shin-ya Koshihara
- Department
of Chemistry and Materials Science, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152-8551, Japan
- CREST, Japan Science and Technology Agency (JST),
O-okayama, Meguro-ku, Tokyo 152-8551, Japan
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39
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Ueda A, Yamada S, Isono T, Kamo H, Nakao A, Kumai R, Nakao H, Murakami Y, Yamamoto K, Nishio Y, Mori H. Hydrogen-Bond-Dynamics-Based Switching of Conductivity and Magnetism: A Phase Transition Caused by Deuterium and Electron Transfer in a Hydrogen-Bonded Purely Organic Conductor Crystal. J Am Chem Soc 2014; 136:12184-92. [DOI: 10.1021/ja507132m] [Citation(s) in RCA: 105] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Akira Ueda
- The
Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - Shota Yamada
- The
Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
- Department
of Physics, Faculty of Science, Toho University, Funabashi, Chiba 274-8510, Japan
| | - Takayuki Isono
- The
Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - Hiromichi Kamo
- The
Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - Akiko Nakao
- Comprehensive Research
Organization for Science and Society (CROSS), Tokai, Ibaraki 319-1106, Japan
| | - Reiji Kumai
- CMRC and Photon
Factory, Institute of Materials Structure Science, High Energy Accelerator
Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - Hironori Nakao
- CMRC and Photon
Factory, Institute of Materials Structure Science, High Energy Accelerator
Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - Youichi Murakami
- CMRC and Photon
Factory, Institute of Materials Structure Science, High Energy Accelerator
Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - Kaoru Yamamoto
- Department
of Applied Physics, Okayama University of Science, Okayama 700-0005, Japan
| | - Yutaka Nishio
- Department
of Physics, Faculty of Science, Toho University, Funabashi, Chiba 274-8510, Japan
| | - Hatsumi Mori
- The
Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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40
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Noma H, Ohara K, Naito T. [Cu(dmit)2]2− Building Block for Molecular Conductors and Magnets with Photocontrollable Spin Distribution. CHEM LETT 2014. [DOI: 10.1246/cl.140318] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Hiroki Noma
- Graduate School of Science and Engineering, Ehime University
| | - Keishi Ohara
- Graduate School of Science and Engineering, Ehime University
| | - Toshio Naito
- Graduate School of Science and Engineering, Ehime University
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41
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Starodub VA, Starodub TN. Radical anion salts and charge transfer complexes based on tetracyanoquinodimethane and other strong π-electron acceptors. RUSSIAN CHEMICAL REVIEWS 2014. [DOI: 10.1070/rc2014v083n05abeh004299] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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42
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Cui H, Kobayashi H, Ishibashi S, Sasa M, Iwase F, Kato R, Kobayashi A. A Single-Component Molecular Superconductor. J Am Chem Soc 2014; 136:7619-22. [DOI: 10.1021/ja503690m] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- HengBo Cui
- Condensed
Molecular Materials Laboratory, RIKEN, Wako-shi, Saitama 351-0198, Japan
| | - Hayao Kobayashi
- Department
of Chemistry, College of Humanities and Sciences, Nihon University, Sakurajosui, Setagaya-ku, Tokyo 156-8550, Japan
| | - Shoji Ishibashi
- Nanosystem
Research Institute (NRI) “Research Initiative of Computational
Sciences (RICS)”, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
| | - Masaaki Sasa
- R&D Strategy and Planning Office, FUJITSU R&D CENTER CO., LTD, 13/F, Tower A, Ocean International Center, NO.56 Dong Si Huan Zhong Rd, Chaoyang District, Beijing P. R. China 100025
| | - Fumitatsu Iwase
- Condensed
Molecular Materials Laboratory, RIKEN, Wako-shi, Saitama 351-0198, Japan
| | - Reizo Kato
- Condensed
Molecular Materials Laboratory, RIKEN, Wako-shi, Saitama 351-0198, Japan
| | - Akiko Kobayashi
- Department
of Chemistry, College of Humanities and Sciences, Nihon University, Sakurajosui, Setagaya-ku, Tokyo 156-8550, Japan
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43
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Kato R. Development of π-Electron Systems Based on [M(dmit)2] (M = Ni and Pd; dmit: 1,3-dithiole-2-thione-4,5-dithiolate) Anion Radicals. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2014. [DOI: 10.1246/bcsj.20130290] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- Reizo Kato
- Condensed Molecular Materials Laboratory, RIKEN
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44
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Awaga K, Nomura K, Kishida H, Fujita W, Yoshikawa H, Matsushita MM, Hu L, Shuku Y, Suizu R. Electron-Transfer Processes in Highly-Correlated Electron Systems of Thiazyl Radicals. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2014. [DOI: 10.1246/bcsj.20130248] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Kunio Awaga
- Research Center for Materials Science, Nagoya University
- Department of Chemistry, Graduate School of Science, Nagoya University
- CREST, Nagoya University
| | - Kenji Nomura
- Research Center for Materials Science, Nagoya University
- Department of Chemistry, Graduate School of Science, Nagoya University
| | - Hideo Kishida
- Department of Applied Physics, Graduate School of Engineering, Nagoya University
| | - Wataru Fujita
- Research Center for Materials Science, Nagoya University
- Department of Chemistry, Graduate School of Science, Nagoya University
| | - Hirofumi Yoshikawa
- Research Center for Materials Science, Nagoya University
- Department of Chemistry, Graduate School of Science, Nagoya University
| | - Michio M. Matsushita
- Research Center for Materials Science, Nagoya University
- Department of Chemistry, Graduate School of Science, Nagoya University
| | - Laigui Hu
- Research Center for Materials Science, Nagoya University
- Department of Chemistry, Graduate School of Science, Nagoya University
| | - Yoshiaki Shuku
- Research Center for Materials Science, Nagoya University
- Department of Chemistry, Graduate School of Science, Nagoya University
| | - Rie Suizu
- Research Center for Materials Science, Nagoya University
- Department of Chemistry, Graduate School of Science, Nagoya University
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45
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Takubo N, Tajima N, Yamamoto HM, Kato R. Nonlinear photocurrent with a threshold of excitation density induced by the long-range electron-electron interaction in the charge-ordered molecular conductor (BEDT-TTF)3(ClO4)2. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2014; 26:055603. [PMID: 24444590 DOI: 10.1088/0953-8984/26/2/055603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We investigated a photoexcited state in the molecular conductor (BEDT-TTF)3(ClO4)2 (BEDT-TTF = bis(ethylenedithio)tetrathiafulvalene) with charge localization due to the electron-electron Coulomb interaction. Photocurrent induced by intramolecular excitation was observed in a charge-ordered insulating state. As a result, nonlinear photocurrent with a threshold of excitation light density was experimentally obtained. The threshold decreased as the temperature increased. This nonlinear photocurrent indicates a transition from an excitonic state to a free excited electronic state. The excitonic state below the threshold is formed by the long-range electron-electron Coulomb interaction. In the free excited electronic state above the threshold, high-density photoexcitation induces Coulomb screening, which results in exciton dissociation and a free electronic state.
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Affiliation(s)
- Naoko Takubo
- RIKEN, Hirosawa 2-1, Wako-shi, Saitama 351-0198, Japan
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46
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Shin KS, Jeannin O, Brezgunova M, Dahaoui S, Aubert E, Espinosa E, Auban-Senzier P, Świetlik R, Frąckowiak A, Fourmigué M. Inter-layer charge disproportionation in the dual-layer organic metal (tTTF-I)2ClO4with unsymmetrical I⋯O halogen bond interactions. Dalton Trans 2014; 43:5280-91. [DOI: 10.1039/c3dt52801d] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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47
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Mochida T, Nagabuchi E, Takahashi M, Mori H. Biferrocenium salts with magnetite-like mixed-valence iron: coexistence of Fe3+ and Fe2.5+ in the crystal. Chem Commun (Camb) 2014; 50:2481-3. [DOI: 10.1039/c3cc49568j] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
[Bis(isopropylthio)biferrocene]2[Ni(mnt)2]3 contains a biferrocenium monocation and dication within the same crystal; the coexistence of Fe3+ and Fe2.5+ was revealed by 57Fe Mössbauer spectroscopy.
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Affiliation(s)
- Tomoyuki Mochida
- Department of Chemistry
- Graduate School of Science
- Kobe University
- Nada, Japan
- Department of Chemistry
| | - Eri Nagabuchi
- Department of Chemistry
- Faculty of Science
- Toho University
- Funabashi, Japan
| | - Masashi Takahashi
- Department of Chemistry
- Faculty of Science
- Toho University
- Funabashi, Japan
| | - Hatsumi Mori
- Institute for Solid State Physics
- The University of Tokyo
- Kashiwa, Japan
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Olejniczak I, Frąckowiak A, Świetlik R, Prokhorova TG, Yagubskii EB. Charge fluctuations and ethylene-group-ordering transition in β''-(BEDT-TTF)4[(H3O)Fe(C2O4)3]⋅Y molecular charge-transfer salts. Chemphyschem 2013; 14:3925-35. [PMID: 24203664 DOI: 10.1002/cphc.201300754] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2013] [Indexed: 11/09/2022]
Abstract
The polarized infrared reflectance and Raman spectra of the three quasi-two-dimensional β''-(BEDT-TTF)4[(H3O)Fe(C2O4)3]⋅Y bifunctional charge-transfer salts, where BEDT-TTF = bis(ethylenedithio)tetrathiafulvalene and Y = C6H5Br, (C6H5CN)0.17(C6H5Br)0.83, (C6H5CN)0.4(C6H5F)0.6, have been measured as a function of the temperature. Signatures of charge inhomogenity have been found in both Raman and infrared spectra of the β''-(BEDT-TTF)4[(H3O)Fe(C2O4)3]⋅Y superconductors. A 100 K transition to a mixed insulating/metallic state is clearly seen for the first time in the temperature dependence of the electronic spectra of superconducting β''-(BEDT-TTF)4[(H3O)Fe(C2O4)3]⋅C6H5Br. We suggest that this phase transition is due to subtle changes in the ethylene groups ordering, which are related to a structural phase transition in the anionic layer. The infrared and Raman spectra of quasi-two-dimensional metal α-'pseudo-κ'-(BEDT-TTF)4[(H3O)Fe(C2O4)3]C6H4Br2 are also investigated.
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Affiliation(s)
- Iwona Olejniczak
- Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań (Poland).
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Tanaka Y, Yonemitsu K. Charge order and possible bias-induced metastable state in the organic conductor β-(meso-DMBEDT-TTF)2PF6: effects of structural distortion. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2013; 25:465603. [PMID: 24158705 DOI: 10.1088/0953-8984/25/46/465603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We theoretically investigate charge order and nonlinear conduction in the quasi-two-dimensional organic conductor β-(meso-DMBEDT-TTF)2PF6 (DMBEDT-TTF=dimethylbis(ethylenedithio)tetrathiafulvalene). Within the Hartree-Fock approximation, we study the effects of structural distortion on the experimentally observed checkerboard charge order and its bias-induced melting by using an extended Hubbard model with Peierls- and Holstein-types of electron-lattice interactions. The structural distortion is important in realizing the charge order. The current-voltage characteristics obtained by a nonequilibrium Green's function method indicate that a charge-ordered insulating state changes into a conductive state. Although the charge order and lattice distortions are largely suppressed at a threshold voltage, they remain finite even in the conductive state. We discuss the relevance of the results to experimental observations, especially to a possible bias-induced metastable state.
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Affiliation(s)
- Y Tanaka
- Department of Physics, Chuo University, Bunkyo-ku, Tokyo 112-8551, Japan. JST, CREST, Chiyoda-ku, Tokyo 102-0076, Japan
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Misawa T, Yoshitake J, Motome Y. Charge order in a two-dimensional Kondo lattice model. PHYSICAL REVIEW LETTERS 2013; 110:246401. [PMID: 25165942 DOI: 10.1103/physrevlett.110.246401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2013] [Indexed: 06/03/2023]
Abstract
The possibility of charge order is theoretically examined for the Kondo lattice model in two dimensions, which does not include bare repulsive interactions. Using two complementary numerical methods, we find that charge order appears at quarter filling in an intermediate Kondo coupling region. The charge ordered ground state is an insulator exhibiting an antiferromagnetic order at charge-poor sites, while the paramagnetic charge-ordered state at finite temperatures is metallic with pseudogap behavior. We confirm that the stability of charge order is closely related with the local Kondo-singlet formation at charge-rich sites. Our results settle the controversy on charge order in the Kondo lattice model in realistic spatial dimensions.
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Affiliation(s)
- Takahiro Misawa
- Department of Applied Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Junki Yoshitake
- Department of Applied Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Yukitoshi Motome
- Department of Applied Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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