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Song MS, Houben L, Zhao Y, Bae H, Rothem N, Gupta A, Yan B, Kalisky B, Zaluska-Kotur M, Kacman P, Shtrikman H, Beidenkopf H. Topotaxial mutual-exchange growth of magnetic Zintl Eu 3In 2As 4 nanowires with axion insulator classification. NATURE NANOTECHNOLOGY 2024:10.1038/s41565-024-01762-7. [PMID: 39187582 DOI: 10.1038/s41565-024-01762-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2024] [Accepted: 07/18/2024] [Indexed: 08/28/2024]
Abstract
Due to quasi-one-dimensional confinement, nanowires possess unique electronic properties, which can promote specific device architectures. However, nanowire growth presents paramount challenges, limiting the accessible crystal structures and elemental compositions. Here we demonstrate solid-state topotactic exchange that converts wurtzite InAs nanowires into Zintl Eu3In2As4. Molecular-beam-epitaxy-based in situ evaporation of Eu and As onto InAs nanowires results in the mutual exchange of Eu from the shell and In from the core. Therefore, a single-phase Eu3In2As4 shell grows, which gradually consumes the InAs core. The mutual exchange is supported by the substructure of the As matrix, which is similar across the wurtzite InAs and Zintl Eu3In2As4 and therefore is topotactic. The Eu3In2As4 nanowires undergo an antiferromagnetic transition at a Néel temperature of ~6.5 K. Ab initio calculations confirm the antiferromagnetic ground state and classify Eu3In2As4 as a C2T axion insulator, hosting both chiral hinge modes and unpinned Dirac surface states. The topotactic mutual-exchange nanowire growth will, thus, enable the exploration of intricate magneto-topological states in Eu3In2As4 and potentially in other exotic compounds.
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Affiliation(s)
- Man Suk Song
- Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot, Israel
| | - Lothar Houben
- Department of Chemical Research Support, Weizmann Institute of Science, Rehovot, Israel
| | - Yufei Zhao
- Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot, Israel
| | - Hyeonhu Bae
- Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot, Israel
| | - Nadav Rothem
- Department of Physics and Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat Gan, Israel
| | - Ambikesh Gupta
- Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot, Israel
| | - Binghai Yan
- Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot, Israel
| | - Beena Kalisky
- Department of Physics and Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat Gan, Israel
| | | | - Perla Kacman
- Institute of Physics, Polish Academy of Sciences, Warsaw, Poland
| | - Hadas Shtrikman
- Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot, Israel.
| | - Haim Beidenkopf
- Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot, Israel.
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2
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Damay F. Following the guidelines for communicating commensurate magnetic structures: real case examples. ACTA CRYSTALLOGRAPHICA SECTION B, STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS 2024; 80:235-248. [PMID: 39136538 PMCID: PMC11301900 DOI: 10.1107/s2052520624005407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/30/2024] [Accepted: 06/06/2024] [Indexed: 08/16/2024]
Abstract
A few real case examples are presented on how to report magnetic structures, with precise step-by-step explanations, following the guidelines of the IUCr Commission on Magnetic Structures [Perez-Mato et al. (2024). Acta Cryst. B80, 219-234]. Four examples have been chosen, illustrating different types of single-k magnetic orders, from the basic case to more complex ones, including odd-harmonics, and one multi-k order. In addition to acquainting researchers with the process of communicating commensurate magnetic structures, these examples also aim to clarify important concepts, which are used throughout the guidelines, such as the transformation to a standard setting of a magnetic space group.
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Affiliation(s)
- F. Damay
- Université Paris-Saclay, Laboratoire Léon Brillouin, CEA-CNRS UMR 12Gif-sur-Yvette91191France
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3
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Engel S, Gießelmann ECJ, Schumacher L, Zhang Y, Müller F, Janka O. Synthesis, magnetic and NMR spectroscopic properties of the MAl 5Pt 3 series (M = Ca, Y, La-Nd, Sm-Er). Dalton Trans 2024; 53:12176-12188. [PMID: 38967221 DOI: 10.1039/d4dt01296h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/06/2024]
Abstract
Following recent investigation in the ternary system Sr-Al-Pt led to the discovery of SrAl5Pt3 which crystallizes in the orthorhombic YNi5Si3 type (Pnma) structure. Interestingly, only two more aluminum representatives, CeAl5Pt3 and EuAl5Pt3, have been reported to adopt this structure type. Therefore, we decided to investigate the existence range of compounds adopting the YNi5Si3 type structure. Besides the already known Sr, Ce and Eu members, the series could be extended to Ca, Y and La-Nd as well as Sm-Er. All compounds were synthesized from the elements and characterized by powder X-ray diffraction. While for CaAl5Pt3 and LaAl5Pt3 also the respective M2Al16Pt9 members were observed, the other compounds could be obtained either as X-ray pure materials or with small amounts of Al3Pt2 as a side phase. The structure of ErAl5Pt3 could be refined from single crystal data, verifying that also the small rare-earth elements adopt the YNi5Si3 type structure. Selected members of the series were furthermore characterized by magnetization and susceptibility measurements. Since YAl5Pt3 could be obtained as a phase pure material and exhibits no paramagnetic behaviour it was investigated by 27Al MAS NMR investigations. Also, XPS measurements were conducted on this compound to gain an insight into the charge distribution. Finally, quantum-chemical calculations supported the NMR measurements and gave an insight into the chemical bonding and the charge distribution.
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Affiliation(s)
- Stefan Engel
- Inorganic Solid State Chemistry, Saarland University, Campus C4 1, 66123 Saarbrücken, Germany.
| | - Elias C J Gießelmann
- Inorganic Solid State Chemistry, Saarland University, Campus C4 1, 66123 Saarbrücken, Germany.
| | - Lars Schumacher
- Institut für Anorganische und Analytische Chemie, Universität Münster, Corrensstrasse 28/30, 48149 Münster, Germany
| | - Yuemei Zhang
- Department of Chemistry and Physics, Warren Wilson College, Swannanoa, NC, 28778, USA
| | - Frank Müller
- Experimental Physics and Center for Biophysics, Saarland University, Campus E2 9, 66123 Saarbrücken, Germany
| | - Oliver Janka
- Inorganic Solid State Chemistry, Saarland University, Campus C4 1, 66123 Saarbrücken, Germany.
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4
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Gharsallah H, Jeddi M, Bejar M, Dhahri E, Nouari S. Study of the correlation between the magnetic and electrical properties of the La 0.6Sr 0.4MnO 3 compound. RSC Adv 2024; 14:21692-21705. [PMID: 38979444 PMCID: PMC11229085 DOI: 10.1039/d4ra03528c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2024] [Accepted: 06/25/2024] [Indexed: 07/10/2024] Open
Abstract
In this work, we investigated the relationship between the electrical and magnetic properties of the superparamagnetic (SPM) La0.6Sr0.4MnO3 (S1C0) compound prepared by the sol-gel method. The (S1C0) sample displayed a ferromagnetic metallic (FMM) behavior at low temperatures and a paramagnetic semiconductor (PMSC) behavior at high temperatures. The FMM behavior was described by the Zener Double Exchange (ZDE) polynomial law containing the contributions of the electron-electron (e-e) interactions and the electron-magnon (e-m) scattering. The PMSC behavior was described by the Mott Variable Range Hopping (Mott-VRH) transport model. The semiconductor/metallic transition temperature has been approximated at the blocking temperature. The Thermal Coefficient of Resistivity (TCR), which exhibits a linear variation around ambient temperature, can be used as a calibration curve for thermometry. Thus, our sample can be considered as a good candidate for the detection of infrared radiation used in night vision bolometer technologies.
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Affiliation(s)
- H Gharsallah
- Laboratoire de Physique Appliquée, Faculté des Sciences, Université de Sfax B. P. 1171 3000 Sfax Tunisia +216 74 676 609 +216 98 333 873
- Institut Préparatoire aux Études d'Ingénieur de Sfax, Université de Sfax BP 1172 3018 Sfax Tunisia
| | - M Jeddi
- Laboratoire de Physique Appliquée, Faculté des Sciences, Université de Sfax B. P. 1171 3000 Sfax Tunisia +216 74 676 609 +216 98 333 873
| | - M Bejar
- Laboratoire de Physique Appliquée, Faculté des Sciences, Université de Sfax B. P. 1171 3000 Sfax Tunisia +216 74 676 609 +216 98 333 873
- Faculté des Sciences de Monastir, Université de Monastir Avenue de l'environnement 5019 Monastir Tunisia
| | - E Dhahri
- Laboratoire de Physique Appliquée, Faculté des Sciences, Université de Sfax B. P. 1171 3000 Sfax Tunisia +216 74 676 609 +216 98 333 873
| | - S Nouari
- Department of Mechanical Engineering, King Fahd University of Petroleum and Minerals Dhahran Saudi Arabia
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5
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Watanabe A, Koshimizu M, Watanabe K, Sato A, Fujimoto Y, Asai K. Scintillation properties of lithium-6 salicylate-loaded liquid scintillators. Phys Chem Chem Phys 2024; 26:9329-9339. [PMID: 38444296 DOI: 10.1039/d4cp00042k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2024]
Abstract
The limited availability of conventional 3He proportional counters provides impetus for developing novel neutron detectors. As a candidate, lithium-6-loaded liquid scintillators with neutron/gamma pulse shape discrimination (n-γ PSD) capabilities have been developed. However, the trade-off relationship between the 6Li-loading amount and scintillation light yield is a significant problem. This is because 6Li-loading involves the addition of non-luminescent materials, which cause non-radiative relaxation of the excited states. Therefore, aiming to reduce non-radiative relaxation, we chose lithium-6 salicylate (6LiSal), which shows fluorescence in the visible light region, as a chemical for 6Li-loading. In this study, we analyzed the photoluminescence/scintillation properties based on the Förster resonance energy transfer and investigated the optimal content for obtaining a high light yield. By maximizing the sequential energy transfer from the solvent (toluene) to the phosphor (POPOP), a high light yield 6Li-loaded liquid scintillator (4220 photons per MeV under gamma-ray irradiation) with a 6Li concentration of approximately 0.1 wt% was developed. Thermal neutron events were successfully detected with a light yield of 3970 photons per neutron, which is more than three times higher than those of other organic scintillators. In addition, focusing on the triplet-triplet annihilation process and further optimizing the component for the n-γ PSD, the thermal neutron and gamma-ray events were successfully separated. The developed high light yield 6Li-loaded liquid scintillators show n-γ PSD capabilities and can be promising candidates as alternative detectors to the 3He proportional counter.
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Affiliation(s)
- Akito Watanabe
- Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, 6-6-07 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan.
| | - Masanori Koshimizu
- Research Institute of Electronics, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu 432-8011, Japan.
| | - Kenichi Watanabe
- Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Atsushi Sato
- Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, 6-6-07 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan.
| | - Yutaka Fujimoto
- Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, 6-6-07 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan.
| | - Keisuke Asai
- Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, 6-6-07 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan.
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6
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Kane M, Bhandari C, Holtz ME, Balakrishnan PP, Grutter AJ, Fitzsimmons M, Yang CY, Satpathy S, Paudyal D, Suzuki Y. Emergent Ferromagnetism in CaRuO 3/CaMnO 3 (111)-Oriented Superlattices. NANO LETTERS 2024; 24:2567-2573. [PMID: 38367281 DOI: 10.1021/acs.nanolett.3c04623] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/19/2024]
Abstract
The boundary between CaRuO3 and CaMnO3 is an ideal test bed for emergent magnetic ground states stabilized through interfacial electron interactions. In this system, nominally antiferromagnetic and paramagnetic materials combine to yield interfacial ferromagnetism in CaMnO3 due to electron leakage across the interface. In this work, we show that the crystal symmetry at the surface is a critical factor determining the nature of the interfacial interactions. Specifically, by growing CaRuO3/CaMnO3 heterostructures along the (111) instead of the (001) crystallographic axis, we achieve a 3-fold enhancement of the magnetization and involve the CaRuO3 layers in the ferromagnetism, which now spans both constituent materials. The stabilization of a net magnetic moment in CaRuO3 through strain effects has been long-sought but never consistently achieved, and our observations demonstrate the importance of interface engineering in the development of new functional heterostructures.
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Affiliation(s)
- Margaret Kane
- Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, United States
- Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, United States
| | - Churna Bhandari
- Ames National Laboratory, Iowa State University, Ames, Iowa 50011, United States
| | - Megan E Holtz
- Metallurgical and Materials Engineering, Colorado School of Mines, Golden, Colorado 80401, United States
| | - Purnima P Balakrishnan
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
| | - Alexander J Grutter
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
| | - Michael Fitzsimmons
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830 United States
| | - Chao-Yao Yang
- Department of Material Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu City 30100, Taiwan
| | - Sashi Satpathy
- Department of Physics & Astronomy, University of Missouri, Columbia, Missouri 65211, United States
| | - Durga Paudyal
- Ames National Laboratory, Iowa State University, Ames, Iowa 50011, United States
- Department of Electrical and Computer Engineering, Iowa State University, Ames, Iowa 50011, United States
| | - Yuri Suzuki
- Department of Applied Physics, Stanford University, Stanford, California 94305, United States
- Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, United States
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7
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Nadig PR, M S M, Daivajna MD. Influence of heat sintering on the physical properties of bulk La 0.67Ca 0.33MnO 3 perovskite manganite: role of oxygen in tuning the magnetocaloric response. Phys Chem Chem Phys 2024; 26:5237-5252. [PMID: 38261427 DOI: 10.1039/d3cp04185a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2024]
Abstract
The effect of heat treatments on bulk poly-crystalline La0.67Ca0.33MnO3 perovskite manganite is presented, to explore the possible enhancement in magnetocaloric performance. Samples were prepared via conventional solid-state reaction route with annealing and sintering at various temperatures. Detailed measurements of temperature-dependent and field-dependent magnetization were carried out to estimate the Curie point and order of magnetic transition. The increased sintering temperature results in a steep transition near the TC, and establishes the magnetic sensitivity as well as the active zone for substantial magnetocaloric performance, at about 168.2% for the LCM9 (sintered at 900 °C) sample. The cause for the significant improvement in the magnetic and magnetocaloric response is brought to light using detailed X-ray photoelectron spectroscopy (XPS) analysis, highlighting the role of oxygen in modifying the Mn3+/Mn4+ charge ratio. The maximum value of the isothermal magnetic entropy change for the optimized sample is found to be 6.4 J kg-1 K-1, achieved at 269 K, while temperature-averaged entropy change (TEC) values, TEC(ΔTH-C = 3 K) and TEC(ΔTH-C = 5 K), of 6 J kg-1 K-1 and 5.2 J kg-1 K-1, respectively, were obtained with a low magnetic field change of 20 kOe. The obtained isothermal entropy change at low field for the optimized La0.67Ca0.33MnO3 sample is higher than that of pure Gd and most oxide-based materials. The relative cooling power (RCP) value is around 93 J kg-1 (ΔH = 20 kOe). The order of the phase transition is examined with universal scaling; the scaled entropy change curves confirm the collapse onto a single curve for LCM9, asserting second-order character, whereas the breakdown of the curve with a dispersion relation (d) of 101.1% at Θ = -5 confirms the onset of intrinsic first-order nature in the case of the high-temperature-sintered samples. Calorimetry measurements show thermal hysteresis of 2.4 K and 7.1 K for LCM11 (sintered at 1100 °C) at ramp rates of 5 K min-1 and 10 K min-1, respectively, confirming the first-order nature of the magnetic transition.
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Affiliation(s)
- Pramod R Nadig
- Department of Physics, Manipal Institute of Technology (MIT), Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India.
| | - Murari M S
- DST PURSE Program, Mangalore University, Mangalagangotri, Mangalore, Karnataka, 574199, India
| | - Mamatha D Daivajna
- Department of Physics, Manipal Institute of Technology (MIT), Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India.
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8
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Alshalawi D, Alonso JM, Landa-Cánovas AR, de la Presa P. Transition from AFM Spin Canting to Spin Glass-AFM Exchange as Particle Size Decreases in LaFeO 3. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:nano13101657. [PMID: 37242073 DOI: 10.3390/nano13101657] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Revised: 05/11/2023] [Accepted: 05/13/2023] [Indexed: 05/28/2023]
Abstract
In this work, we have studied structural and magnetic properties of LaFeO3 as a function of the particle size d, from bulk (d >> 1 µm) to nanoscale (d ≈ 30 nm). A large number of twins were observed for large particles that disappear for small particle sizes. This could be related to the softening of the FeO6 distortion as particle size decreases. It was observed that the bulk sample showed spin canting that disappeared for d ~ 125 nm and can be associated with the smoothening of the orthorhombic distortion. On the other hand, for d < 60 nm, the surface/volume ratio became high and, despite the high crystallinity of the nanoparticle, a notable exchange effect bias appeared, originated by two magnetic interactions: spin glass and antiferromagnetism. This exchange bias interaction was originated by the formation of a "magnetic core-shell": the broken bonds at the surface atoms give place to a spin glass behavior, whereas the inner atoms maintain the antiferromagnetic G-type order. The LaFeO3 bulk material was synthesized by the ceramic method, whereas the LaFeO3 nanoparticles were synthesized by the sol-gel method; the particle size was varied by annealing the samples at different temperatures. The physical properties of the materials have been investigated by XRD, HRTEM, TGA, and AC and DC magnetometry.
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Affiliation(s)
- Dhoha Alshalawi
- Institute of Applied Magnetism, UCM-ADIF, A6 22,500 km, 28230 Las Rozas, Spain
| | - Jose María Alonso
- Institute of Applied Magnetism, UCM-ADIF, A6 22,500 km, 28230 Las Rozas, Spain
- Material Science Institute of Madrid, CSIC, 28049 Madrid, Spain
| | | | - Patricia de la Presa
- Institute of Applied Magnetism, UCM-ADIF, A6 22,500 km, 28230 Las Rozas, Spain
- Department of Materials Physics, Complutense University of Madrid, 28040 Madrid, Spain
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9
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Chen T, Ye Y, Wang Y, Fang C, Lin W, Jiang Y, Xu B, Ouyang C, Zheng J. Tuning a small electron polaron in FePO 4 by P-site or O-site doping based on DFT+ U and KMC simulation. Phys Chem Chem Phys 2023; 25:8734-8742. [PMID: 36896849 DOI: 10.1039/d2cp06034e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/02/2023]
Abstract
Due to the existence of a small polaron, the intrinsic electronic conductivity of olivine-structured LiFePO4 is quite low, limiting its performance as a cathode material for lithium-ion batteries (LIBs). Previous studies have mainly focused on improving intrinsic conductivity through Fe-site doping while P-site or O-site doping has rarely been reported. Herein, we studied the formation and dynamics of the small electron polaron in FeP1-αXαO4 and FePO4-βZβ by employing the density functional theory with the on-site Hubbard correction terms (DFT+U) and Kinetic Monte Carlo (KMC) simulation, where X and Z indicate the doping elements (X = S, Se, As, Si, V; Z = S, F, Cl), and α and β indicate the light doping at the P position (α = 0.0625) and O position (β = 0.015625), respectively. We confirmed the small electron polaron formation in pristine FePO4 and its doped systems, and the polaron hopping rates for all systems were calculated according to the Marcus-Emin-Holstein-Austin-Mott (MEHAM) theory. We found that the hopping process is adiabatic for most cases with the defects breaking the original symmetry. Based on the KMC simulation results, we found that the doping of S at the P site changes the polaron's motion mode, which is expected to increase the mobility and intrinsic electronic conductivity. This study attempts to provide theoretical guidance to improve the electronic conductivity of LiFePO4-like cathode materials with better rate performance.
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Affiliation(s)
- Taowen Chen
- School of Advanced Materials, Peking University, Shenzhen Graduate School, Shenzhen 518055, People's Republic of China.
| | - Yaokun Ye
- School of Advanced Materials, Peking University, Shenzhen Graduate School, Shenzhen 518055, People's Republic of China.
| | - Ying Wang
- School of Advanced Materials, Peking University, Shenzhen Graduate School, Shenzhen 518055, People's Republic of China.
| | - Chi Fang
- School of Advanced Materials, Peking University, Shenzhen Graduate School, Shenzhen 518055, People's Republic of China.
| | - Weicheng Lin
- School of Advanced Materials, Peking University, Shenzhen Graduate School, Shenzhen 518055, People's Republic of China.
| | - Yao Jiang
- Fujian Science & Technology Innovation Laboratory for Energy Devices of China (21C-LAB), Ningde 352100, People's Republic of China.
| | - Bo Xu
- Fujian Science & Technology Innovation Laboratory for Energy Devices of China (21C-LAB), Ningde 352100, People's Republic of China.
| | - Chuying Ouyang
- Fujian Science & Technology Innovation Laboratory for Energy Devices of China (21C-LAB), Ningde 352100, People's Republic of China.
| | - Jiaxin Zheng
- School of Advanced Materials, Peking University, Shenzhen Graduate School, Shenzhen 518055, People's Republic of China.
- Fujian Science & Technology Innovation Laboratory for Energy Devices of China (21C-LAB), Ningde 352100, People's Republic of China.
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10
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Xu Y, Tan Z, Chen WT, Chang CK, Chuang YC, Goto M, Shimakawa Y. High-Pressure Synthesized Perovskite CdMnO 3 with C-Type Antiferromagnetic Spin Configuration. Inorg Chem 2022; 61:21011-21015. [PMID: 36517465 DOI: 10.1021/acs.inorgchem.2c03497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
CdMnO3 had not been previously reported and was a missing piece in the A2+Mn4+O3 series. We succeeded in synthesizing this compound by a high-pressure method and confirmed that it is crystallized in a distorted perovskite structure with a Cd2+Mn4+O3 charge configuration. The obtained insulating CdMnO3 exhibits an antiferromagnetic transition at about 86 K. First-principles calculations revealed that the Mn4+ (t2g3) spins form a C-type antiferromagnetic structure, which is in sharp contrast to the G-type antiferromagnetism in the isostructural and isoelectronic CaMnO3. Significant overlap of the Mn-3d and O(2)-2p orbitals produces distorted octahedra with a large Mn-O(1)-Mn tilt and induces antiferromagnetic couplings in the ac plane and the ferromagnetic couplings along the b axis.
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Affiliation(s)
- Yuanhui Xu
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan.,Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, P.R. China
| | - Zhenhong Tan
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Wei-Tin Chen
- Center for Condensed Matter Sciences and Center of Atomic Initiative for New Materials, National Taiwan University, Taipei 10617, Taiwan.,Taiwan Consortium of Emergent Crystalline Materials, National Science and Technology Council, Taipei 10622 Taiwan
| | - Chung-Kai Chang
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - Yu-Chun Chuang
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - Masato Goto
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Yuichi Shimakawa
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
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11
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Why is Mn charge ordered and AFM coupled in YBaMn2O5? J SOLID STATE CHEM 2022. [DOI: 10.1016/j.jssc.2022.123469] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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12
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Guo K, Tao Y, Liu Y, Lyu Y, Pan Z. One-Stage Hydrothermal Growth and Characterization of Epitaxial LaMnO 3 Films on SrTiO 3 Substrate. MATERIALS (BASEL, SWITZERLAND) 2022; 15:5928. [PMID: 36079310 PMCID: PMC9457439 DOI: 10.3390/ma15175928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Revised: 08/21/2022] [Accepted: 08/22/2022] [Indexed: 06/15/2023]
Abstract
Epitaxial LaMnO3 thin films were grown on SrTiO3 substrate using a one-stage hydrothermal route from La(NO3)3, MnCl2 and KMnO4 in an aqueous solution of 10 M KOH at 340 °C. Scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) indicate full coverage of LaMnO3 on the substrate. X-ray diffraction in the symmetric ω/2θ mode suggests the film has an out-of-plane preferred orientation along the [001] direction of the substrate. The LaMnO3 epitaxial thin film growth mechanism is proposed based on the analysis of the atomic sharp interface formed between LaMnO3 and the SrTiO3 substrate, as seen by aberration-corrected scanning transmission electron microscopy (AC-STEM) imaging in combination with electronic energy loss spectroscopy (EELS). Compared with the conventional vapor deposition methods, the one-stage hydrothermal route opens up a new way to fabricate complex oxide epitaxial heterostructures.
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13
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Grain-Size-Induced Collapse of Variable Range Hopping and Promotion of Ferromagnetism in Manganite La0.5Ca0.5MnO3. CRYSTALS 2022. [DOI: 10.3390/cryst12050724] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Abstract
Among transition metal oxides, manganites have attracted significant attention because of colossal magnetoresistance (CMR)—a magnetic field-induced metal–insulator transition close to the Curie temperature. CMR is closely related to the ferromagnetic (FM) metallic phase which strongly competes with the antiferromagnetic (AFM) charge ordered (CO) phase, where conducting electrons localize and create a long range order giving rise to insulator-like behavior. One of the major open questions in manganites is the exact origin of this insulating behavior. Here we report a dc resistivity and magnetization study on manganite La1−xCaxMnO3 ceramic samples with different grain size, at the very boundary between CO/AFM insulating and FM metallic phases x=0.5. Clear signatures of variable range hopping (VRH) are discerned in resistivity, implying the disorder-induced (Anderson) localization of conducting electrons. A significant increase of disorder associated with the reduction in grain size, however, pushes the system in the opposite direction from the Anderson localization scenario, resulting in a drastic decrease of resistivity, collapse of the VRH, suppression of the CO/AFM phase and growth of an FM contribution. These contradictory results are interpreted within the standard core-shell model and recent theories of Anderson localization of interacting particles.
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Grimm B, Bredow T. Partial substitution of the Mn atoms in CaMnO 3 by first row transition metal atoms: effect on oxygen vacancy formation. ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES 2022. [DOI: 10.1515/znb-2022-0025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Sustainable hydrogen production is one of the most challenging topics in modern energy economics. Electrochemical and thermal splitting of water are promising techniques, but are highly energy demanding. Efficient hydrogen evolution reaction catalysts can play a key role to lower the electrolysis potential and to make water splitting more feasible. Among other perovskites, CaMnO3 has been identified as efficient electrode material due to its relatively high oxygen vacancy concentrations at elevated temperatures. But this compound needs to be further improved for technical use. In this study, the effect of Mn substitution in CaMnO3 by 3d metals M = Sc, Ti, V, Cr, Fe, Co, Ni, Cu and Zn on the oxygen vacancy formation energy is investigated theoretically at DFT level. Vacancy formation energies, enthalpies and free enthalpies are calculated with a combination of hybrid and GGA density functionals. Configuration entropy is taken into account by calculating all possible configurations of M and oxygen vacancy site in supercell models. The calculated oxygen vacancy formation energies are strongly affected by Mn/M substitution, the most promising heteroelement being Cu. CaMn0.875Cu0.125O2.875 and CaMn0.875Cu0.125O2.75 are in equilibrium at 537 K, compared to 1231 K for CaMnO2.875/CaMnO2.75 and 1350 K for CaMnO3/CaMnO2.875.
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Affiliation(s)
- Benjamin Grimm
- Mulliken Center for Theoretical Chemistry , Institut für Physikalische und Theoretische Chemie, University of Bonn , Beringstr. 4, 53115 Bonn , Germany
| | - Thomas Bredow
- Mulliken Center for Theoretical Chemistry , Institut für Physikalische und Theoretische Chemie, University of Bonn , Beringstr. 4, 53115 Bonn , Germany
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15
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Ma Z, Tan L, Huang H, He L, Chen J, Lu H, Deng S, Yin W, Zhang J, Tian H, Du R, Arnold DC, Phillips AE, Dove MT. Neutron powder-diffraction study of phase transitions in strontium-doped bismuth ferrite: 1. Variation with chemical composition. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 34:255401. [PMID: 35366646 DOI: 10.1088/1361-648x/ac6389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2021] [Accepted: 04/01/2022] [Indexed: 06/14/2023]
Abstract
We report results from a study of the crystal and magnetic structures of strontium-doped BiFeO3using neutron powder diffraction and the Rietveld method. Measurements were obtained over a wide range of temperatures from 300-800 K for compositions between 10%-16% replacement of bismuth by strontium. The results show a clear variation of the two main structural deformations-symmetry-breaking rotations of the FeO6octahedra and polar ionic displacements that give ferroelectricity-with chemical composition, but relatively little variation with temperature. On the other hand, the antiferromagnetic order shows a variation with temperature and a second-order phase transition consistent with the classical Heisenberg model. There is, however, very little variation in the behaviour of the antiferromagnetism with chemical composition, and hence with the degree of the structural symmetry-breaking distortions. We therefore conclude that there is no significant coupling between antiferromagnetism and ferroelectricity in Sr-doped BiFeO3and, by extension, in pure BiFeO3.
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Affiliation(s)
- Zhengzheng Ma
- Department of Physics, School of Sciences, Wuhan University of Technology, 205 Luoshi Road, Hongshan district, Wuhan, Hubei, 430070, People's Republic of China
| | - Lei Tan
- Department of Physics, School of Sciences, Wuhan University of Technology, 205 Luoshi Road, Hongshan district, Wuhan, Hubei, 430070, People's Republic of China
| | - Haijun Huang
- Department of Physics, School of Sciences, Wuhan University of Technology, 205 Luoshi Road, Hongshan district, Wuhan, Hubei, 430070, People's Republic of China
| | - Lunhua He
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, People's Republic of China
- Spallation Neutron Source Science Center, Dongguan, Guangdong 523803, People's Republic of China
| | - Jie Chen
- Spallation Neutron Source Science Center, Dongguan, Guangdong 523803, People's Republic of China
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Huaile Lu
- Spallation Neutron Source Science Center, Dongguan, Guangdong 523803, People's Republic of China
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Sihao Deng
- Spallation Neutron Source Science Center, Dongguan, Guangdong 523803, People's Republic of China
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Wen Yin
- Spallation Neutron Source Science Center, Dongguan, Guangdong 523803, People's Republic of China
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Junrong Zhang
- Spallation Neutron Source Science Center, Dongguan, Guangdong 523803, People's Republic of China
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Haolai Tian
- Spallation Neutron Source Science Center, Dongguan, Guangdong 523803, People's Republic of China
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Rong Du
- Spallation Neutron Source Science Center, Dongguan, Guangdong 523803, People's Republic of China
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Donna C Arnold
- School of Physical Sciences, University of Kent, Canterbury, Kent CT2 7NH, United Kingdom
| | - Anthony E Phillips
- School of Physical and Chemical Sciences, Queen Mary University of London, Mile End Road, London, E1 4NS, United Kingdom
| | - Martin T Dove
- Department of Physics, School of Sciences, Wuhan University of Technology, 205 Luoshi Road, Hongshan district, Wuhan, Hubei, 430070, People's Republic of China
- School of Physical and Chemical Sciences, Queen Mary University of London, Mile End Road, London, E1 4NS, United Kingdom
- College of Computer Science, Sichuan University, Chengdu, Sichuan 610065, People's Republic of China
- School of Mechanical Engineering, Dongguan University of Technology, 1st Daxue Road, Songshan Lake, Dongguan, Guangdong 523000, People's Republic of China
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16
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Issaoui H, Gharbi S, Issaoui F, Hcini S, Alzahrani B, Bouazizi M, Al Robei H, dhahri E. Study of the doping of Sr by Ag in manganites La0.57Nd0.1Sr0.33-xAgxMnO3 (0.00–0.15) on assessment structural, magneticand Magnetocaloric at room temperature. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2021.132282] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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17
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Belik AA, Liu R, Zhang L, Terada N, Tanaka M, Yamaura K. Multiple magnetic transitions and complex magnetic behaviour of the perovskite manganite NdMn7O12. J SOLID STATE CHEM 2022. [DOI: 10.1016/j.jssc.2022.122969] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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18
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Structural and Magnetic Properties of Nanosized Half-Doped Rare-Earth Ho0.5Ca0.5MnO3 Manganite. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12020695] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
We investigated the structural and magnetic properties of 20 nm-sized nanoparticles of the half-doped manganite Ho0.5Ca0.5MnO3 prepared by sol-gel approach. Neutron powder diffraction patterns show Pbnm orthorhombic symmetry for 10 K < T < 290 K, with lattice parameters a, b, and c in the relationship c/√2 < a < b, indicating a cooperative Jahn–Teller effect, i.e., orbital ordering OO, from below room temperature. In contrast with the bulk samples, in the interval 250 < T < 300 K, the fingerprint of charge ordering (CO) does not manifest itself in the temperature dependence of lattice parameters. However, there are signs of CO in the temperature dependence of magnetization. Accordingly, below 100 K superlattice magnetic Bragg reflections arise, which are consistent with an antiferromagnetic phase strictly related to the bulk Mn ordering of a charge exchange-type (CE-type), but characterized by an increased fraction of ferromagnetic couplings between manganese species themselves. Our results show that in this narrow band half-doped manganite, size reduction only modifies the balance between the Anderson superexchange and Zener double exchange interactions, without destabilizing an overall very robust antiferromagnetic state.
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Belik AA, Johnson RD, Khalyavin DD. The rich physics of A-site-ordered quadruple perovskite manganites AMn 7O 12. Dalton Trans 2021; 50:15458-15472. [PMID: 34632992 DOI: 10.1039/d1dt02992d] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Perovskite-structure AMnO3 manganites played an important role in the development of numerous physical concepts such as double exchange, small polarons, electron-phonon coupling, and Jahn-Teller effects, and they host a variety of important properties such as colossal magnetoresistance and spin-induced ferroelectric polarization (multiferroicity). A-site-ordered quadruple perovskite manganites AMn7O12 were discovered shortly after, but at that time their exploration was quite limited. Significant progress in their understanding has been reached in recent years after the wider use of high-pressure synthesis techniques needed to prepare such materials. Here we review this progress, and show that the AMn7O12 compounds host rich physics beyond the canonical AMnO3 materials.
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Affiliation(s)
- Alexei A Belik
- International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan.
| | - Roger D Johnson
- Department of Physics and Astronomy, University College London, Gower Street, London, WC1E 6BT, UK
| | - Dmitry D Khalyavin
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX, UK
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20
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Shin Y, Rondinelli JM. Strain-Induced Magnetic Transitions in SrMO 2.5 (M = Mn, Fe) Thin Films with Ordered Oxygen Vacancies. Inorg Chem 2021; 60:13161-13167. [PMID: 34410712 DOI: 10.1021/acs.inorgchem.1c01553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We examine the epitaxial-strain-induced phase transitions in thin films of perovskite-derived SrMnO2.5 and SrFeO2.5 exhibiting ordered oxygen vacancies (OOVs). We find that SrMnO2.5 hosts multiple magnetic transitions to other ordered states, including antiferromagnetic (AFM) and ferromagnetic (FM) orders of E*-AFM, C-AFM, and FM types depending on the compressive or tensile strain state. In contrast, no magnetic transitions occur in thin-film SrFeO2.5 (G-AFM to FM), whereas its bulk phase exhibits a hydrostatic pressure-induced AFM-to-FM transition. We explain the origin of these dependencies on the transition-metal configuration, that is, d4 Mn versus d5 Fe, and the relative orientation of the OOVs in the Ca2Mn2O5-type structure with respect to the epitaxial interface. We find that the magnetic phase stability can be predicted by using exchange striction arguments, with FM (AFM) spin interactions preferring longer (shorter) Mn-O bonds in the square pyramidal MnO5 unit comprising SrMnO2.5. Because the Mn-O bond lengths directly shrink or elongate to accommodate the applied stress without considerable polyhedral rotations, we show that compressive and tensile strain tune the unit cell structure to favor different combinations of exchange interactions that stabilize the various magnetic spin orders. Our study shows that the strong coupling between the OOV structure and spin orders with epitaxial strain is a promising route to achieve picoscale control of functional electronic and magnetic responses in complex oxide thin films.
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Affiliation(s)
- Yongjin Shin
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - James M Rondinelli
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
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21
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Wollstadt S, Ikeda Y, Sarkar A, Vasala S, Fasel C, Alff L, Kruk R, Grabowski B, Clemens O. Structural and Magnetic Properties of BaFeO 2.667 Synthesized by Oxidizing BaFeO 2.5 Obtained via Nebulized Spray Pyrolysis. Inorg Chem 2021; 60:10923-10933. [PMID: 34240868 DOI: 10.1021/acs.inorgchem.1c00434] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A vacancy-ordered perovskite-type compound Ba3Fe3O8 (BaFeO2.667) was prepared by oxidizing BaFeO2.5 (P21/c) with the latter compound obtained by a spray pyrolysis technique. The structure of Ba3Fe3O8 was found to be isotypic to Ba3Fe3O7F (P21/m) and can be written as Ba3Fe3+2Fe4+1O8. Mössbauer spectroscopy and ab initio calculations were used to confirm mixed iron oxidation states, showing allocation of the tetravalent iron species on the tetrahedral site, and octahedral as well as square pyramidal coordination for the trivalent species within a G-type antiferromagnetic ordering. The uptake and release of oxygen were investigated over a broad temperature range from room temperature to 1100 °C under pure oxygen and ambient atmosphere via a combination of DTA/TG and variable temperature diffraction measurements. The compound exhibited a strong lattice enthalpy driven reduction to monoclinic and cubic BaFeO2.5 at elevated temperatures.
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Affiliation(s)
- Stephan Wollstadt
- Institute for Materials Science, Materials Synthesis Group, University of Stuttgart, Heisenbergstraße 3, Stuttgart 70569, Germany.,Institut für Materialwissenschaft, Fachgebiet Materialdesign durch Synthese, Technical University of Darmstadt, Alarich-Weiss-Straße 2, Darmstadt 64287, Germany
| | - Yuji Ikeda
- Institute for Materials Science, Department of Materials Design, University of Stuttgart, Pfaffenwaldring 55, Stuttgart 70569, Germany
| | - Abhishek Sarkar
- Institut für Nanotechnologie, Karlsruher Institut für Technologie, Hermann-von-Helmholtz-Platz 1, Eggenstein Leopoldshafen 76344, Germany.,Institut für Materialwissenschaft, Gemeinschaftslabor Nanomaterialien, Technical University of Darmstadt, Alarich-Weiss-Straße 2, Darmstadt 64287, Germany
| | - Sami Vasala
- Institut für Materialwissenschaft, Fachgebiet Materialdesign durch Synthese, Technical University of Darmstadt, Alarich-Weiss-Straße 2, Darmstadt 64287, Germany
| | - Claudia Fasel
- Institut für Materialwissenschaft, Fachgebiet Disperse Feststoffe, Technical University of Darmstadt Alarich-Weiss-Straße 2, 64287 Darmstadt, Germany
| | - Lambert Alff
- Institut für Materialwissenschaft, Advanced Thin Film Technology, Technical University of Darmstadt Alarich-Weiss-Straße 2, 64287 Darmstadt, Germany
| | - Robert Kruk
- Institut für Nanotechnologie, Karlsruher Institut für Technologie, Hermann-von-Helmholtz-Platz 1, Eggenstein Leopoldshafen 76344, Germany
| | - Blazej Grabowski
- Institute for Materials Science, Department of Materials Design, University of Stuttgart, Pfaffenwaldring 55, Stuttgart 70569, Germany
| | - Oliver Clemens
- Institute for Materials Science, Materials Synthesis Group, University of Stuttgart, Heisenbergstraße 3, Stuttgart 70569, Germany.,Institut für Materialwissenschaft, Fachgebiet Materialdesign durch Synthese, Technical University of Darmstadt, Alarich-Weiss-Straße 2, Darmstadt 64287, Germany
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22
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Fabrykiewicz P, Przeniosło R, Sosnowska I. Magnetic modes compatible with the symmetry of crystals. Acta Crystallogr A Found Adv 2021; 77:327-338. [DOI: 10.1107/s2053273321004551] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2020] [Accepted: 04/28/2021] [Indexed: 05/31/2023] Open
Abstract
A classification of magnetic point groups is presented which gives an answer to the question: which magnetic groups can describe a given magnetic mode? There are 32 categories of magnetic point groups which describe 64 unique magnetic modes: 16 with a ferromagnetic component and 48 without. This classification focused on magnetic modes is helpful for finding the magnetic space group which can describe the magnetic symmetry of the material.
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23
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Wang H, Zhang H, Wang Y, Tan W, Huo D. Spin glass feature and exchange bias effect in metallic Pt/antiferromagnetic LaMnO 3heterostructure. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:285802. [PMID: 33975300 DOI: 10.1088/1361-648x/ac0023] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Accepted: 05/11/2021] [Indexed: 06/12/2023]
Abstract
Emergent phenomena at interfaces have been investigated intensely in pursuit of the next generation spintronics. In this work, we have integrated heterostructure consisting of paramagnetic (PM) metallic Pt and antiferromagnetic (AFM) insulator LaMnO3(LMO). High-quality Pt (3 nm)/LMO (100 nm) heterostructure has been obtained by pulsed laser deposition. The structure, lattice strain and magnetic properties of epitaxial Pt/LMO heterostructure are fully studied. Due to the high sensitivity of synchrotron radiation and the high quality of epitaxial layer, the reflection intensity of the 3 nm-thick ultrathin Pt layer and LMO layer can be detected, and then lattice strain can be calculated. The LMO layer is under relative large tensile strain (2.13%), while the Pt layer is under relative small compressive strain (-0.46%). Magnetization measurements suggest that unexpected ferromagnetic behavior is observed clearly in the PM-Pt/AFM-LMO heterostructure. Moreover, spin glass (SG) state and exchange bias (EB) is also observed in this heterostructure. SG state is observed as a result of competing magnetic orders and spin frustration at the Pt/LMO interface. The heterostructure shows the EB effect below blocking temperature (TB), which is much lower than the Néel temperature (TN) of LMO, suggesting that the EB is strongly related to the SG state. The EB originates from the coupling between the SG and AFM phases.
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Affiliation(s)
- Haiou Wang
- Key Laboratory of Novel Materials for Sensor of Zhejiang Province, Institute of Material Physics, Hangzhou Dianzi University, Hangzhou 310018, People's Republic of China
| | - Hui Zhang
- Key Laboratory of Novel Materials for Sensor of Zhejiang Province, Institute of Material Physics, Hangzhou Dianzi University, Hangzhou 310018, People's Republic of China
| | - Yan Wang
- Key Laboratory of Novel Materials for Sensor of Zhejiang Province, Institute of Material Physics, Hangzhou Dianzi University, Hangzhou 310018, People's Republic of China
| | - Weishi Tan
- All-solid-state Energy Storage Materials and Devices Key Laboratory of Hunan Province, College of Information and Electronic Engineering, Hunan City University, Yiyang 413002, People's Republic of China
- Key Laboratory of Soft Chemistry and Functional Materials, Ministry of Education, Department of Applied Physics, Nanjing University of Science and Technology, Nanjing 210094, People's Republic of China
| | - Dexuan Huo
- Key Laboratory of Novel Materials for Sensor of Zhejiang Province, Institute of Material Physics, Hangzhou Dianzi University, Hangzhou 310018, People's Republic of China
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Ye X, Zhao J, Das H, Sheptyakov D, Yang J, Sakai Y, Hojo H, Liu Z, Zhou L, Cao L, Nishikubo T, Wakazaki S, Dong C, Wang X, Hu Z, Lin HJ, Chen CT, Sahle C, Efiminko A, Cao H, Calder S, Mibu K, Kenzelmann M, Tjeng LH, Yu R, Azuma M, Jin C, Long Y. Observation of novel charge ordering and spin reorientation in perovskite oxide PbFeO 3. Nat Commun 2021; 12:1917. [PMID: 33772004 PMCID: PMC7997894 DOI: 10.1038/s41467-021-22064-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Accepted: 02/25/2021] [Indexed: 02/01/2023] Open
Abstract
PbMO3 (M = 3d transition metals) family shows systematic variations in charge distribution and intriguing physical properties due to its delicate energy balance between Pb 6s and transition metal 3d orbitals. However, the detailed structure and physical properties of PbFeO3 remain unclear. Herein, we reveal that PbFeO3 crystallizes into an unusual 2ap × 6ap × 2ap orthorhombic perovskite super unit cell with space group Cmcm. The distinctive crystal construction and valence distribution of Pb2+0.5Pb4+0.5FeO3 lead to a long range charge ordering of the -A-B-B- type of the layers with two different oxidation states of Pb (Pb2+ and Pb4+) in them. A weak ferromagnetic transition with canted antiferromagnetic spins along the a-axis is found to occur at 600 K. In addition, decreasing the temperature causes a spin reorientation transition towards a collinear antiferromagnetic structure with spin moments along the b-axis near 418 K. Our theoretical investigations reveal that the peculiar charge ordering of Pb generates two Fe3+ magnetic sublattices with competing anisotropic energies, giving rise to the spin reorientation at such a high critical temperature.
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Affiliation(s)
- Xubin Ye
- grid.458438.60000 0004 0605 6806Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China ,grid.410726.60000 0004 1797 8419School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Jianfa Zhao
- grid.458438.60000 0004 0605 6806Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China ,grid.410726.60000 0004 1797 8419School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Hena Das
- grid.32197.3e0000 0001 2179 2105Laboratory for Materials and Structures, Tokyo Institute of Technology, Yokohama, Kanagawa Japan ,grid.32197.3e0000 0001 2179 2105Tokyo Tech World Research Hub Initiative (WRHI), Institute of Innovative Research, Tokyo Institute of Technology, Yokohama, Kanagawa Japan
| | - Denis Sheptyakov
- grid.5991.40000 0001 1090 7501Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, Villigen, Switzerland
| | - Junye Yang
- grid.5991.40000 0001 1090 7501Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, Villigen, Switzerland
| | - Yuki Sakai
- grid.32197.3e0000 0001 2179 2105Laboratory for Materials and Structures, Tokyo Institute of Technology, Yokohama, Kanagawa Japan ,Kanagawa Institute of Industrial Science and Technology, Ebina, Japan
| | - Hajime Hojo
- grid.177174.30000 0001 2242 4849Department of Advanced Materials and Engineering, Faculty of Engineering Sciences, Kyushu University, Kasuga, Japan
| | - Zhehong Liu
- grid.458438.60000 0004 0605 6806Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China ,grid.410726.60000 0004 1797 8419School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Long Zhou
- grid.458438.60000 0004 0605 6806Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China ,grid.410726.60000 0004 1797 8419School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Lipeng Cao
- grid.458438.60000 0004 0605 6806Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China
| | - Takumi Nishikubo
- grid.32197.3e0000 0001 2179 2105Laboratory for Materials and Structures, Tokyo Institute of Technology, Yokohama, Kanagawa Japan
| | - Shogo Wakazaki
- grid.32197.3e0000 0001 2179 2105Laboratory for Materials and Structures, Tokyo Institute of Technology, Yokohama, Kanagawa Japan
| | - Cheng Dong
- grid.458438.60000 0004 0605 6806Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China ,grid.410726.60000 0004 1797 8419School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Xiao Wang
- grid.419507.e0000 0004 0491 351XMax-Planck Institute for Chemical Physics of Solids, Dresden, Germany
| | - Zhiwei Hu
- grid.419507.e0000 0004 0491 351XMax-Planck Institute for Chemical Physics of Solids, Dresden, Germany
| | - Hong-Ji Lin
- grid.410766.20000 0001 0749 1496National Synchrotron Radiation Research Center, Hsinchu, Taiwan, ROC
| | - Chien-Te Chen
- grid.410766.20000 0001 0749 1496National Synchrotron Radiation Research Center, Hsinchu, Taiwan, ROC
| | - Christoph Sahle
- grid.5398.70000 0004 0641 6373European Synchrotron Radiation Facility, Grenoble, France
| | - Anna Efiminko
- grid.5398.70000 0004 0641 6373European Synchrotron Radiation Facility, Grenoble, France
| | - Huibo Cao
- grid.135519.a0000 0004 0446 2659Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN USA
| | - Stuart Calder
- grid.135519.a0000 0004 0446 2659Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN USA
| | - Ko Mibu
- grid.47716.330000 0001 0656 7591Graduate School of Engineering, Nagoya Institute of Technology, Nagoya, Japan
| | - Michel Kenzelmann
- grid.5991.40000 0001 1090 7501Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, Villigen, Switzerland
| | - Liu Hao Tjeng
- grid.419507.e0000 0004 0491 351XMax-Planck Institute for Chemical Physics of Solids, Dresden, Germany
| | - Runze Yu
- grid.458438.60000 0004 0605 6806Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China ,grid.410726.60000 0004 1797 8419School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, China ,grid.32197.3e0000 0001 2179 2105Tokyo Tech World Research Hub Initiative (WRHI), Institute of Innovative Research, Tokyo Institute of Technology, Yokohama, Kanagawa Japan
| | - Masaki Azuma
- grid.32197.3e0000 0001 2179 2105Laboratory for Materials and Structures, Tokyo Institute of Technology, Yokohama, Kanagawa Japan ,Kanagawa Institute of Industrial Science and Technology, Ebina, Japan
| | - Changqing Jin
- grid.458438.60000 0004 0605 6806Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China ,grid.410726.60000 0004 1797 8419School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, China ,Songshan Lake Materials Laboratory, Dongguan, Guangdong China
| | - Youwen Long
- grid.458438.60000 0004 0605 6806Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China ,grid.410726.60000 0004 1797 8419School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, China ,Songshan Lake Materials Laboratory, Dongguan, Guangdong China
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25
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Xia J, Guo J, Zhang X, Lan M, Wen J, Wang S, He Y, Xiang G, Corrias A, Boi FS. Anomalous stepped-hysteresis and T-induced unit-cell-volume reduction in carbon nanotubes continuously filled with faceted Fe3C nanowires. NANO EXPRESS 2021. [DOI: 10.1088/2632-959x/abe605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Abstract
Ferromagnetically-filled carbon nanotubes have been recently considered important candidates for application into data recording quantum disk devices. Achievement of high filling rates of the ferromagnetic materials is particularly desirable for applications. Here we report the novel observation of carbon nanotubes continuously filled along the capillary with unusual μm-long faceted Fe3C nanowires. Anomalous magnetic features possibly due to strain effects of the crystal facets are reported. Magnetization measurements revealed unusual stepped magnetic hysteresis-loops at 300 K and at 2 K together with an anomalous decrease in the coercivity at low temperature. The observed unusual shape of the hysteresis is ascribed to the existence of an antiferromagnetic transition within or at the boundary of the ferromagnetic facets. The collapse in the coercivity value as the temperature decreases and the characteristic width-enhancement of the hysteresis with the field increasing appear to indicate the existence of layered antiferromagnetic phases, possibly in the strain-rich regions of the nanowire facets. Zero field cooled (ZFC) and field cooled (FC) magnetic curves evidenced presence of magnetic irreversibilities, an indicator of a possible spin-glass-like behavior induced by competing antiferromagnetic and ferromagnetic interactions. Characterization performed with low temperature XRD measurements, further revealed a slight variation in the average Fe3C unit cell parameters, suggesting the absence of additional unit-cell volume induced ferromagnetic transitions at low temperature.
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26
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El-Moez A. Mohamed A, Álvarez-Alonso P, Hernando B. The intrinsic exchange bias effect in the LaMnO3 and LaFeO3 compounds. JOURNAL OF ALLOYS AND COMPOUNDS 2021; 850:156713. [DOI: 10.1016/j.jallcom.2020.156713] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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27
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Lindenthal L, Ruh T, Rameshan R, Summerer H, Nenning A, Herzig C, Löffler S, Limbeck A, Opitz AK, Blaha P, Rameshan C. Ca-doped rare earth perovskite materials for tailored exsolution of metal nanoparticles. ACTA CRYSTALLOGRAPHICA SECTION B, STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS 2020; 76:1055-1070. [PMID: 33289717 DOI: 10.1107/s2052520620013475] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Accepted: 10/07/2020] [Indexed: 06/12/2023]
Abstract
Perovskite-type oxide materials (nominal composition ABO3) are a very versatile class of materials, and their properties are tuneable by varying and doping A- and B-site cations. When the B-site contains easily reducible cations (e.g. Fe, Co or Ni), these can exsolve under reducing conditions and form metallic nanoparticles on the surface. This process is very interesting as a novel route for the preparation of catalysts, since oxide surfaces decorated with finely dispersed catalytically active (often metallic) nanoparticles are a key requirement for excellent catalyst performance. Five doped perovskites, namely, La0.9Ca0.1FeO3-δ, La0.6Ca0.4FeO3-δ, Nd0.9Ca0.1FeO3-δ, Nd0.6Ca0.4FeO3-δ and Nd0.6Ca0.4Fe0.9Co0.1O3-δ, have been synthesized and characterized by experimental and theoretical methods with respect to their crystal structures, electronic properties, morphology and exsolution behaviour. All are capable of exsolving Fe and/or Co. Special emphasis has been placed on the influence of the A-site elemental composition on structure and exsolution capability. Using Nd instead of La increased structural distortions and, at the same time, hindered exsolution. Increasing the amount of Ca doping also increased distortions and additionally changed the Fe oxidation states, resulting in exsolution being shifted to higher temperatures as well. Using the easily reducible element Co as the B-site dopant significantly facilitated the exsolution process and led to much smaller and homogeneously distributed exsolved particles. Therefore, the Co-doped perovskite is a promising material for applications in catalysis, even more so as Co is catalytically a highly active element. The results show that fine-tuning of the perovskite composition will allow tailored exsolution of nanoparticles, which can be used for highly sophisticated catalyst design.
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Affiliation(s)
- Lorenz Lindenthal
- Institute of Materials Chemistry, TU Wien, Getreidmarkt 9/165, Vienna 1060, Austria
| | - Thomas Ruh
- Institute of Materials Chemistry, TU Wien, Getreidmarkt 9/165, Vienna 1060, Austria
| | - Raffael Rameshan
- Institute of Materials Chemistry, TU Wien, Getreidmarkt 9/165, Vienna 1060, Austria
| | - Harald Summerer
- Institute of Materials Chemistry, TU Wien, Getreidmarkt 9/165, Vienna 1060, Austria
| | - Andreas Nenning
- Institute of Chemical Technologies and Analytics, TU Wien, Getreidmarkt 9/164, Vienna 1060, Austria
| | - Christopher Herzig
- Institute of Chemical Technologies and Analytics, TU Wien, Getreidmarkt 9/164, Vienna 1060, Austria
| | - Stefan Löffler
- USTEM, TU Wien, Wiedner Hauptstraße 8-10/E057-02, Vienna 1060, Austria
| | - Andreas Limbeck
- Institute of Chemical Technologies and Analytics, TU Wien, Getreidmarkt 9/164, Vienna 1060, Austria
| | - Alexander Karl Opitz
- Institute of Chemical Technologies and Analytics, TU Wien, Getreidmarkt 9/164, Vienna 1060, Austria
| | - Peter Blaha
- Institute of Materials Chemistry, TU Wien, Getreidmarkt 9/165, Vienna 1060, Austria
| | - Christoph Rameshan
- Institute of Materials Chemistry, TU Wien, Getreidmarkt 9/165, Vienna 1060, Austria
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28
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Edström A, Ederer C. Prediction of a Giant Magnetoelectric Cross-Caloric Effect around a Tetracritical Point in Multiferroic SrMnO_{3}. PHYSICAL REVIEW LETTERS 2020; 124:167201. [PMID: 32383945 DOI: 10.1103/physrevlett.124.167201] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Accepted: 03/25/2020] [Indexed: 06/11/2023]
Abstract
We study the magnetoelectric and electrocaloric response of strain-engineered, multiferroic SrMnO_{3}, using a phenomenological Landau theory with all parameters obtained from first-principles-based calculations. This allows us to make realistic semiquantitative and materials-specific predictions about the magnitude of the corresponding effects. We find that in the vicinity of a tetracritical point, where magnetic and ferroelectric phase boundaries intersect, an electric field has a huge effect on the antiferromagnetic order, corresponding to a magnetoelectric response several orders of magnitude larger than in conventional linear magnetoelectrics. Furthermore, the strong magnetoelectric coupling leads to a magnetic, cross-caloric contribution to the electrocaloric effect, which increases the overall caloric response by about 60%. This opens up new potential applications of antiferromagnetic multiferroics in the context of environmentally friendly solid state cooling technologies.
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Affiliation(s)
- Alexander Edström
- Materials Theory, ETH Zürich, Wolfgang-Pauli-Strasse 27, 8093 Zürich, Switzerland
| | - Claude Ederer
- Materials Theory, ETH Zürich, Wolfgang-Pauli-Strasse 27, 8093 Zürich, Switzerland
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29
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Radzieowski M, Stegemann F, Janka O. Magnetic Properties of the
RE
2
Pt
6
X
15
(
RE
= Y, La–Nd, Sm, Gd–Lu;
X
= Al, Ga) Series. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.201901332] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Mathis Radzieowski
- Institut für Anorganische und Analytische Chemie Westfälische Wilhelms‐Universität Corrensstraße 28/30 48149 Münster Germany
| | - Frank Stegemann
- Institut für Anorganische und Analytische Chemie Westfälische Wilhelms‐Universität Corrensstraße 28/30 48149 Münster Germany
| | - Oliver Janka
- Institut für Anorganische und Analytische Chemie Westfälische Wilhelms‐Universität Corrensstraße 28/30 48149 Münster Germany
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30
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Abstract
In heterogeneous catalysis, surfaces decorated with uniformly dispersed, catalytically-active (nano)particles are a key requirement for excellent performance. Beside standard catalyst preparation routines—with limitations in controlling catalyst surface structure (i.e., particle size distribution or dispersion)—we present here a novel time efficient route to precisely tailor catalyst surface morphology and composition of perovskites. Perovskite-type oxides of nominal composition ABO3 with transition metal cations on the B-site can exsolve the B-site transition metal upon controlled reduction. In this exsolution process, the transition metal emerges from the oxide lattice and migrates to the surface where it forms catalytically active nanoparticles. Doping the B-site with reducible and catalytically highly active elements, offers the opportunity of tailoring properties of exsolution catalysts. Here, we present the synthesis of two novel perovskite catalysts Nd0.6Ca0.4FeO3-δ and Nd0.6Ca0.4Fe0.9Co0.1O3-δ with characterisation by (in situ) XRD, SEM/TEM and XPS, supported by theory (DFT+U). Fe nanoparticle formation was observed for Nd0.6Ca0.4FeO3-δ. In comparison, B site cobalt doping leads, already at lower reduction temperatures, to formation of finely dispersed Co nanoparticles on the surface. These novel perovskite-type catalysts are highly promising for applications in chemical energy conversion. First measurements revealed that exsolved Co nanoparticles significantly improve the catalytic activity for CO2 activation via reverse water gas shift reaction.
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31
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Jin F, Gu M, Ma C, Guo EJ, Zhu J, Qu L, Zhang Z, Zhang K, Xu L, Chen B, Chen F, Gao G, Rondinelli JM, Wu W. Uniaxial Strain-Controlled Ground States in Manganite Films. NANO LETTERS 2020; 20:1131-1140. [PMID: 31978309 DOI: 10.1021/acs.nanolett.9b04506] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Strongly correlated perovskite oxides exhibit a plethera of intriguing phenomena and stimulate a great potential for multifunctional device applications. Utilizing tunable uniaxial strain, rather than biaxial or anisotropic strain, delivered from the crystallography of a single crystal substrate to modify the ground state of strongly correlated perovskite oxides has rarely been addressed for phase-space control. Here, we show that the physical properties of La2/3Ca1/3MnO3 (LCMO) films are remarkably different depending on the crystallographic orientations of the orthorhombic NdGaO3 (NGO) substrates. More importantly, the antiferromagnetic charge-ordered insulating (COI) phase induced in the (100) or (001)-oriented LCMO films can be dramatically promoted (or suppressed) by a uniaxial tensile (or compressive) bending stress along the in-plane [010] direction. By contrast, the COI phase is nearly unaffected along the other transverse in-plane directions. Results from scanning transmission electron microscopy reveal that the (100)- or (001)-oriented LCMO films are uniaxially tensile strained along the [010] direction, while the LCMO/NGO(010) and LCMO/NGO(110) films remaining as a bulklike ferromagnetic metallic state exhibit a different strain state. Density functional theory calculations further reveal that the cooperatively increased Jahn-Teller distortion and charge ordering may be indispensible for the inducing and promoting of the COI phase. These findings provide a path to understand the correlation between local and extended structural distortions imparted by coherent epitaxy and the electronic states for quantum phase engineering.
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Affiliation(s)
- Feng Jin
- Anhui Key Laboratory of Condensed Matter at Extreme Conditions, High Magnetic Field Laboratory, and Hefei National Laboratory for Physical Sciences at Microscale , University of Science and Technology of China , Hefei 230026 , China
| | - Mingqiang Gu
- Department of Materials Science and Engineering , Northwestern University , Evanston , Illinois 60208 , United States
| | - Chao Ma
- College of Materials Science and Engineering , Hunan University , Changsha 410082 , China
| | - Er-Jia Guo
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics , Chinese Academy of Sciences , Beijing 100190 , China
- Center of Materials Science and Optoelectronics Engineering , University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Jin Zhu
- Anhui Key Laboratory of Condensed Matter at Extreme Conditions, High Magnetic Field Laboratory, and Hefei National Laboratory for Physical Sciences at Microscale , University of Science and Technology of China , Hefei 230026 , China
| | - Lili Qu
- Anhui Key Laboratory of Condensed Matter at Extreme Conditions, High Magnetic Field Laboratory, and Hefei National Laboratory for Physical Sciences at Microscale , University of Science and Technology of China , Hefei 230026 , China
| | - Zixun Zhang
- Anhui Key Laboratory of Condensed Matter at Extreme Conditions, High Magnetic Field Laboratory, and Hefei National Laboratory for Physical Sciences at Microscale , University of Science and Technology of China , Hefei 230026 , China
| | - Kexuan Zhang
- Anhui Key Laboratory of Condensed Matter at Extreme Conditions, High Magnetic Field Laboratory, and Hefei National Laboratory for Physical Sciences at Microscale , University of Science and Technology of China , Hefei 230026 , China
| | - Liqiang Xu
- Anhui Key Laboratory of Condensed Matter at Extreme Conditions, High Magnetic Field Laboratory, and Hefei National Laboratory for Physical Sciences at Microscale , University of Science and Technology of China , Hefei 230026 , China
| | - Binbin Chen
- Anhui Key Laboratory of Condensed Matter at Extreme Conditions, High Magnetic Field Laboratory, and Hefei National Laboratory for Physical Sciences at Microscale , University of Science and Technology of China , Hefei 230026 , China
| | - Feng Chen
- Anhui Key Laboratory of Condensed Matter at Extreme Conditions, High Magnetic Field Laboratory, and Hefei National Laboratory for Physical Sciences at Microscale , University of Science and Technology of China , Hefei 230026 , China
| | - Guanyin Gao
- Anhui Key Laboratory of Condensed Matter at Extreme Conditions, High Magnetic Field Laboratory, and Hefei National Laboratory for Physical Sciences at Microscale , University of Science and Technology of China , Hefei 230026 , China
| | - James M Rondinelli
- Department of Materials Science and Engineering , Northwestern University , Evanston , Illinois 60208 , United States
| | - Wenbin Wu
- Anhui Key Laboratory of Condensed Matter at Extreme Conditions, High Magnetic Field Laboratory, and Hefei National Laboratory for Physical Sciences at Microscale , University of Science and Technology of China , Hefei 230026 , China
- Institutes of Physical Science and Information Technology , Anhui University , Hefei 230601 , China
- Collaborative Innovation Center of Advanced Microstructures , Nanjing University , Nanjing 210093 , China
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32
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Witt M, Bönnighausen J, Eustermann F, Savourat A, Scheifers JP, Fokwa BP, Doerenkamp C, Eckert H, Janka O. Extending the knowledge on the quaternary rare earth nickel aluminum germanides of the RENiAl4Ge2 series (RE=Y, Sm, Gd–Tm, Lu) – structural, magnetic and NMR-spectroscopic investigations. ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES 2020. [DOI: 10.1515/znb-2019-0176] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The quaternary rare earth nickel aluminum germanide series RENiAl4Ge2 (RE = Y, Sm, Gd–Tm, Lu) has been extended by several members. The compounds were synthesized from the elements by arc-melting, and single crystals of YNiAl4Ge2, GdNiAl4Ge2, and LuNiAl4Ge2 were grown from an aluminum flux. All members crystallize isostructurally in the rhombohedral SmNiAl4Ge2-type structure (R3̅m, Z = 3). The compounds can be described as a stacking of RE
δ+ and [NiAl4Ge2]
δ−
slabs with an ABC stacking sequence, or alternatively as stacking of CsCl and CdI2 building blocks. The results of the magnetic measurements indicate that all rare earth atoms are in a trivalent oxidation state. Of the RENiAl4Ge2 series, the members with RE = Sm, Gd–Dy exhibit antiferromagnetic ordering with a maximum Néel temperature of T
N = 16.4(1) K observed for GdNiAl4Ge2. 27Al NMR spectroscopic investigations yielded spectra with two distinct signals, in line with the crystal structure, however, significantly different resonance frequencies of δ
iso
ms(YNiAl4Ge2) = 77(1) and 482(1) ppm as well as δ
iso
ms(LuNiAl4Ge2) = 90(1) and 467(1) ppm were observed. These indicate significantly different s-electron densities at the two crystallographically different Al atoms, in line with the results from DFT calculations. The Bader charge analysis confirms that the present compounds must be considered as germanides, as expected from the relative electronegativities of the constituent elements, while the low charges on Al and Y indicate significant covalent bonding.
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Affiliation(s)
- Melina Witt
- Institut für Anorganische und Analytische Chemie , Westfälische Wilhelms-Universität Münster , Corrensstrasse 28/30 , 48149 Münster , Germany
| | - Judith Bönnighausen
- Institut für Anorganische und Analytische Chemie , Westfälische Wilhelms-Universität Münster , Corrensstrasse 28/30 , 48149 Münster , Germany
| | - Fabian Eustermann
- Institut für Anorganische und Analytische Chemie , Westfälische Wilhelms-Universität Münster , Corrensstrasse 28/30 , 48149 Münster , Germany
| | - Aline Savourat
- Institut für Anorganische und Analytische Chemie , Westfälische Wilhelms-Universität Münster , Corrensstrasse 28/30 , 48149 Münster , Germany
| | - Jan P. Scheifers
- University of California Riverside, Department of Chemistry , 501 Box Springs Rd , Riverside, CA 92521 , USA
| | - Boniface P.T. Fokwa
- University of California Riverside, Department of Chemistry , 501 Box Springs Rd , Riverside, CA 92521 , USA
| | - Carsten Doerenkamp
- Instituto de Física de São Carlos , Universidade de São Paulo , São Carlos , SP 13566-590 , Brazil
| | - Hellmut Eckert
- Instituto de Física de São Carlos , Universidade de São Paulo , São Carlos , SP 13566-590 , Brazil
- Institut für Physikalische Chemie , Westfälische Wilhelms-Universität Münster , Corrensstrasse 28, 48149 Münster , Germany
| | - Oliver Janka
- Institut für Anorganische und Analytische Chemie , Westfälische Wilhelms-Universität Münster , Corrensstrasse 28/30 , 48149 Münster , Germany , Tel.: +49(0)251-83-36074, Fax: +49(0)251-83-36002
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33
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Xia W, Pei Z, Leng K, Zhu X. Research Progress in Rare Earth-Doped Perovskite Manganite Oxide Nanostructures. NANOSCALE RESEARCH LETTERS 2020; 15:9. [PMID: 31933031 PMCID: PMC6957627 DOI: 10.1186/s11671-019-3243-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2019] [Accepted: 12/27/2019] [Indexed: 05/12/2023]
Abstract
Perovskite manganites exhibit a broad range of structural, electronic, and magnetic properties, which are widely investigated since the discovery of the colossal magnetoresistance effect in 1994. As compared to the parent perovskite manganite oxides, rare earth-doped perovskite manganite oxides with a chemical composition of LnxA1-xMnO3 (where Ln represents rare earth metal elements such as La, Pr, Nd, A is divalent alkaline earth metal elements such as Ca, Sr, Ba) exhibit much diverse electrical properties due to that the rare earth doping leads to a change of valence states of manganese which plays a core role in the transport properties. There is not only the technological importance but also the need to understand the fundamental mechanisms behind the unusual magnetic and transport properties that attract enormous attention. Nowadays, with the rapid development of electronic devices toward integration and miniaturization, the feature sizes of the microelectronic devices based on rare earth-doped perovskite manganite are down-scaled into nanoscale dimensions. At nanoscale, various finite size effects in rare earth-doped perovskite manganite oxide nanostructures will lead to more interesting novel properties of this system. In recent years, much progress has been achieved on the rare earth-doped perovskite manganite oxide nanostructures after considerable experimental and theoretical efforts. This paper gives an overview of the state of art in the studies on the fabrication, structural characterization, physical properties, and functional applications of rare earth-doped perovskite manganite oxide nanostructures. Our review first starts with the short introduction of the research histories and the remarkable discoveries in the rare earth-doped perovskite manganites. In the second part, different methods for fabricating rare earth-doped perovskite manganite oxide nanostructures are summarized. Next, structural characterization and multifunctional properties of the rare earth-doped perovskite manganite oxide nanostructures are in-depth reviewed. In the following, potential applications of rare earth-doped perovskite manganite oxide nanostructures in the fields of magnetic memory devices and magnetic sensors, spintronic devices, solid oxide fuel cells, magnetic refrigeration, biomedicine, and catalysts are highlighted. Finally, this review concludes with some perspectives and challenges for the future researches of rare earth-doped perovskite manganite oxide nanostructures.
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Affiliation(s)
- Weiren Xia
- National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing, 210093 China
| | - Zhipeng Pei
- National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing, 210093 China
| | - Kai Leng
- National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing, 210093 China
| | - Xinhua Zhu
- National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing, 210093 China
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34
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Bourguiba M, Gdaiem MA, Chafra M, Hlil EK. Long-range ferromagnetic order in perovskite manganite La 0.67Ba 0.25Ca 0.08Mn (1−x)Ti xO 3 ( x = 0.00, 0.05 and 0.10). RSC Adv 2020; 10:26326-26334. [PMID: 35519774 PMCID: PMC9055391 DOI: 10.1039/d0ra03949g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Accepted: 06/03/2020] [Indexed: 11/21/2022] Open
Abstract
In this study, we report the effects of Ti on the critical behavior of La0.67Ba0.25Ca0.08MnO3 samples prepared by the flux method.
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Affiliation(s)
- Marwa Bourguiba
- Laboratoire de recherche en Mécanique Appliquée et systèmes (LASMAP-EPT)
- Ecole Polytechnique de Tunisie
- Université de Carthage
- Tunisia
- Faculté des sciences de Tunis
| | - Mohamed Amara Gdaiem
- Laboratoire de la Matière Condensée et des Nanosciences
- Département de Physique
- Faculté des Sciences de Monastir
- Tunisia
| | - Moez Chafra
- Laboratoire de recherche en Mécanique Appliquée et systèmes (LASMAP-EPT)
- Ecole Polytechnique de Tunisie
- Université de Carthage
- Tunisia
| | - E. K. Hlil
- Institut Néel
- CNRS et Université Joseph Fourier
- 38042 Grenoble
- France
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35
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Mukesh M, Arun B, Akshay VR, Vasundhara M. Tailoring the magnetic entropy change towards room temperature in Sr-site deficient La 0.6Dy 0.07Sr 0.33MnO 3 manganite. NEW J CHEM 2020. [DOI: 10.1039/d0nj00309c] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The Sr-deficient compound could be a potential candidate for room temperature magnetic refrigeration applications.
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Affiliation(s)
- M. Mukesh
- Materials Science and Technology Division
- CSIR-National Institute for Interdisciplinary Science and Technology
- Trivandrum
- India
| | - B. Arun
- Materials Science and Technology Division
- CSIR-National Institute for Interdisciplinary Science and Technology
- Trivandrum
- India
- Academy of Scientific and Innovative Research (AcSIR)
| | - V. R. Akshay
- Materials Science and Technology Division
- CSIR-National Institute for Interdisciplinary Science and Technology
- Trivandrum
- India
- Academy of Scientific and Innovative Research (AcSIR)
| | - M. Vasundhara
- Materials Science and Technology Division
- CSIR-National Institute for Interdisciplinary Science and Technology
- Trivandrum
- India
- Academy of Scientific and Innovative Research (AcSIR)
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36
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A-site ordered state in manganites with perovskite-like structure based on optimally doped compounds Ln0.70Ba0.30MnO3 (Ln = Pr, Nd). J RARE EARTH 2019. [DOI: 10.1016/j.jre.2018.12.010] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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37
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Yoon H, Jang SW, Sim JH, Kotani T, Han MJ. Magnetic force theory combined with quasi-particle self-consistent GW method. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2019; 31:405503. [PMID: 31220821 DOI: 10.1088/1361-648x/ab2b7e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
We report a successful combination of magnetic force linear response theory with quasiparticle self-consistent GW method. The self-consistently determined wavefunctions and eigenvalues can just be used for the conventional magnetic force calculations. While its formulation is straightforward, this combination provides a way to investigate the effect of GW self-energy on the magnetic interactions which can hardly be quantified due to the limitation of current GW methodology in calculating the total energy difference in between different magnetic phases. In ferromagnetic 3d elements, GW self-energy slightly reduces the d bandwidth and enhances the interactions while the same long-range feature is maintained. In antiferromagnetic transition-metal monoxides, QSGW significantly reduces the interaction strengths by enlarging the gap. Orbital-dependent magnetic force calculations show that the coupling between e g and the nominally-empty 4s orbital is noticeably large in MnO which is reminiscent of the discussion for cuprates regarding the role of Cu-4s state. This combination of magnetic force theory with quasiparticle self-consistent GW can be a useful tool to study various magnetic materials.
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Affiliation(s)
- Hongkee Yoon
- Department of Physics, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
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38
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Li J, Wang Y, Zhang G, Yin H, Chen D, Sun W, Shi B, Cheng Z. Seeking large Seebeck effects in LaX(X = Mn and Co)O 3/SrTiO 3 superlattices by exploiting high spin-polarized effects. Phys Chem Chem Phys 2019; 21:14973-14983. [PMID: 31237601 DOI: 10.1039/c9cp02486g] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
SrTiO3-based transition-metal oxide heterostructures with superconducting, ferromagnetic, ferroelectric, and ferroelastic properties exhibit high application potential in the fields of energy storage, energy conversion, and spintronic devices. Meanwhile, high effective (charge)-Seebeck coefficient materials composed of a ferromagnetic layer and SrTiO3 insulator layer have been achieved but we still have blocks to pursuing high spin-Seebeck coefficient materials. Here, we use first-principles calculations combined with spin-resolved Boltzmann transport theory to investigate the spin- and effective-Seebeck coefficients in the LaX(X = Mn and Co)O3/SrTiO3 superlattice. Compared with the LaMnO3/SrTiO3 superlattice, LaCoO3/SrTiO3 with ferromagnetic ordering has high spin polarization, relatively low valence valley degeneracy but high effective mass. Utilizing these characteristics, the maximum spin-Seebeck coefficient of LaMnO3/SrTiO3 is -152 μV K-1 at 450 K along the cross-plane direction, while LaCoO3/SrTiO3 reaches -247 μV K-1 under the same conditions. Interestingly, the spin- and effective-Seebeck coefficients are amazingly consistent with each other below 200 K, which indicates that one spin channel (spin-up or spin-down) dominates the carrier transport, and the other one (spin-down or spin-up) is filtered out. These characteristics are mainly associated with the magnetic MnO2/CoO2 layers with distinct dxy and dz2 orbitals near the Fermi level. Our results clarify the relationship of spin- and effective-Seebeck coefficients and indicate that SrTiO3-based transition metal oxide heterointerfaces are a key candidate for spin caloritronics.
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Affiliation(s)
- Jingyu Li
- Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng 475004, People's Republic of China.
| | - Yuanxu Wang
- Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng 475004, People's Republic of China.
| | - Guangbiao Zhang
- Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng 475004, People's Republic of China.
| | - Huabing Yin
- Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng 475004, People's Republic of China.
| | - Dong Chen
- Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng 475004, People's Republic of China.
| | - Wei Sun
- Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng 475004, People's Republic of China.
| | - Beibei Shi
- Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng 475004, People's Republic of China.
| | - Zhenxiang Cheng
- Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng 475004, People's Republic of China. and Institute for Superconducting and Electronic Materials, University of Wollongong, Squires Way, North Wollongong, Australia.
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39
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Fedorova AV, Chezhina NV. Exchange Interactions between Atoms of Rare-Earth Elements in the Perovskite Structure. RUSS J GEN CHEM+ 2019. [DOI: 10.1134/s1070363219060070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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40
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Chin C, Battle PD, Hunter EC, Avdeev M, Hendrickx M, Hadermann J. Magnetic properties of La3Ni2Sb Ta Nb1––O9; from relaxor to spin glass. J SOLID STATE CHEM 2019. [DOI: 10.1016/j.jssc.2019.02.044] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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41
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42
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43
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Lemański K, Bondzior B, Szymański D, Dereń PJ. Spectroscopic properties of GdxLa1−xAlO3 nanocrystals doped with Pr3+ ions. NEW J CHEM 2019. [DOI: 10.1039/c9nj00264b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The spectroscopic and structural properties of GdxLa1−xAlO3 nanocrystals doped with praseodymium(iii) ions have been investigated.
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Affiliation(s)
- K. Lemański
- Institute of Low Temperature and Structure Research
- Polish Academy of Sciences
- 50-950 Wrocław
- Poland
| | - B. Bondzior
- Institute of Low Temperature and Structure Research
- Polish Academy of Sciences
- 50-950 Wrocław
- Poland
| | - D. Szymański
- Institute of Low Temperature and Structure Research
- Polish Academy of Sciences
- 50-950 Wrocław
- Poland
| | - P. J. Dereń
- Institute of Low Temperature and Structure Research
- Polish Academy of Sciences
- 50-950 Wrocław
- Poland
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44
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Yang Q, Yao J, Zhang K, Wang W, Zuo X, Tang H, Wu M, Li G. Perovskite-type La1−Ca MnO3 manganese oxides as effective counter electrodes for dye-sensitized solar cells. J Electroanal Chem (Lausanne) 2019. [DOI: 10.1016/j.jelechem.2018.11.006] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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45
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Denis Romero F, Shimakawa Y. Charge transitions in perovskite oxides containing unusually high-valent Fe. Chem Commun (Camb) 2019; 55:3690-3696. [DOI: 10.1039/c8cc10207d] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Localisation of charge carrying ligand holes in perovskite oxides containing high-valent iron leads to unusual structural, magnetic, and transport behavior.
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Affiliation(s)
- Fabio Denis Romero
- Institute for Chemical Research
- Kyoto University
- Uji
- Japan
- Hakubi Center for Advanced Research
| | - Yuichi Shimakawa
- Hakubi Center for Advanced Research
- Kyoto University
- Yoshida-honmachi
- Sakyo-ku
- Japan
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46
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Stegemann F, Janka O. Two series of rare earth metal-rich ternary aluminium transition metallides – RE
6Co2Al (RE=Sc, Y, Nd, Sm, Gd–Tm, Lu) and RE
6Ni2.25Al0.75 (RE=Y, Gd–Tm, Lu). ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES 2018. [DOI: 10.1515/znb-2018-0153] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The rare earth metal-rich cobalt and nickel aluminium compounds with the general compositions RE
6Co2Al (RE=Sc, Y, Nd, Sm, Gd–Tm, Lu) and RE
6Ni2.25Al0.75 (RE=Y, Gd–Tm, Lu) have been synthesised from the elements by arc-melting, followed by annealing. Single-crystal X-ray diffraction experiments on Y6Co2.02(1)Al0.98(1) (Ho6Co2Ga type; Immm; a=944.1(2), b=952.4(2), c=999.0(2) pm; wR2=0.0452, 1123 F
2 values, 35 variables) and Y6Ni2.26(1)Al0.74(1) (Ho6Co2Ga type; Immm; a=938.30(5), b=959.45(5), c=996.05(6) pm; wR2=0.0499, 1131 F
2 values, 35 variables) revealed that the compounds form solid solutions according to the general formula RE
6(Co/Ni)2+
x
Al1−x
with different homogeneity ranges. The compounds of the Ni series can be obtained in X-ray pure form only with the nominal composition RE
6Ni2.25Al0.75. A significant increase of the U
22 component of the anisotropic displacement parameters of the Co/Ni2 atoms (4g site) was observed that requires a description of the structure with a split-position model at RT. Further investigations by low temperature (90 K) single-crystal X-ray diffraction experiments of Y6Co2.02(1)Al0.98(1) showed a significant decrease of U
22. Magnetic measurements were conducted on the X-ray pure members of the RE
6Co2Al (RE=Y, Dy–Tm, Lu) series. Antiferromagnetic ordering was observed for the members with unpaired f electrons with Néel temperatures up to T
N=48.0(1) K and two spin reorientations for Dy6Co2Al.
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Affiliation(s)
- Frank Stegemann
- Institut für Anorganische und Analytische Chemie , Westfälische Wilhelms-Universität Münster , Corrensstraße 30 , 48149 Münster , Germany
| | - Oliver Janka
- Institut für Anorganische und Analytische Chemie , Westfälische Wilhelms-Universität Münster , Corrensstraße 30 , 48149 Münster , Germany
- Institut für Chemie , Carl von Ossietzky Universität Oldenburg , Carl-von-Ossietzky Strasse 9–11 , 26129 Oldenburg , Germany
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47
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Scholz T, Görne AL, Dronskowski R. Itinerant nitrides and salt-like guanidinates – The diversity of solid-state nitrogen chemistry. PROG SOLID STATE CH 2018. [DOI: 10.1016/j.progsolidstchem.2017.04.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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48
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Xu D, Avdeev M, Battle PD. Magnetic properties of CeM1.5M’0.5Ge4O12 (M = Mn, Co; M’ = Ni, Cu). J SOLID STATE CHEM 2018. [DOI: 10.1016/j.jssc.2018.06.025] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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49
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Johnson RD, Mezzadri F, Manuel P, Khalyavin DD, Gilioli E, Radaelli PG. Evolution of Magneto-Orbital order Upon B-Site Electron Doping in Na_{1-x}Ca_{x}Mn_{7}O_{12} Quadruple Perovskite Manganites. PHYSICAL REVIEW LETTERS 2018; 120:257202. [PMID: 29979054 DOI: 10.1103/physrevlett.120.257202] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Revised: 03/28/2018] [Indexed: 06/08/2023]
Abstract
We present the discovery and refinement by neutron powder diffraction of a new magnetic phase in the Na_{1-x}Ca_{x}Mn_{7}O_{12} quadruple perovskite phase diagram, which is the incommensurate analogue of the well-known pseudo-CE phase of the simple perovskite manganites. We demonstrate that incommensurate magnetic order arises in quadruple perovskites due to the exchange interactions between A and B sites. Furthermore, by constructing a simple mean field Heisenberg exchange model that generically describes both simple and quadruple perovskite systems, we show that this new magnetic phase unifies a picture of the interplay between charge, magnetic, and orbital ordering across a wide range of compounds.
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Affiliation(s)
- R D Johnson
- Clarendon Laboratory, Department of Physics, University of Oxford, Oxford OX1 3PU, United Kingdom
| | - F Mezzadri
- Istituto dei Materiali per Elettronica e Magnetismo, CNR, Area delle Scienze, 43100 Parma, Italy
| | - P Manuel
- ISIS Facility, Rutherford Appleton Laboratory-STFC, Chilton, Didcot OX11 0QX, United Kingdom
| | - D D Khalyavin
- ISIS Facility, Rutherford Appleton Laboratory-STFC, Chilton, Didcot OX11 0QX, United Kingdom
| | - E Gilioli
- Istituto dei Materiali per Elettronica e Magnetismo, CNR, Area delle Scienze, 43100 Parma, Italy
| | - P G Radaelli
- Clarendon Laboratory, Department of Physics, University of Oxford, Oxford OX1 3PU, United Kingdom
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50
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Tang Y, Hunter EC, Battle PD, Hendrickx M, Hadermann J, Cadogan JM. Ferrimagnetism as a Consequence of Unusual Cation Ordering in the Perovskite SrLa 2FeCoSbO 9. Inorg Chem 2018; 57:7438-7445. [PMID: 29808998 DOI: 10.1021/acs.inorgchem.8b01012] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A polycrystalline sample of SrLa2FeCoSbO9 has been prepared in a solid-state reaction and studied by a combination of electron microscopy, magnetometry, Mössbauer spectroscopy, X-ray diffraction, and neutron diffraction. The compound adopts a monoclinic (space group P21/ n; a = 5.6218(6), b = 5.6221(6), c = 7.9440(8) Å, β = 90.050(7)° at 300 K) perovskite-like crystal structure with two crystallographically distinct six-coordinate sites. One of these sites is occupied by 2/3 Co2+, 1/3 Fe3+ and the other by 2/3 Sb5+, 1/3 Fe3+. This pattern of cation ordering results in a transition to a ferrimagnetic phase at 215 K. The magnetic moments on nearest-neighbor, six-coordinate cations align in an antiparallel manner, and the presence of diamagnetic Sb5+ on only one of the two sites results in a nonzero remanent magnetization of ∼1 μB per formula unit at 5 K.
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Affiliation(s)
- Yawei Tang
- Inorganic Chemistry Laboratory , University of Oxford , South Parks Road , Oxford OX1 3QR , U.K
| | - Emily C Hunter
- Inorganic Chemistry Laboratory , University of Oxford , South Parks Road , Oxford OX1 3QR , U.K
| | - Peter D Battle
- Inorganic Chemistry Laboratory , University of Oxford , South Parks Road , Oxford OX1 3QR , U.K
| | - Mylène Hendrickx
- EMAT , University of Antwerp , Groenenborgerlaan 171 , 2020 Antwerp , Belgium
| | - Joke Hadermann
- EMAT , University of Antwerp , Groenenborgerlaan 171 , 2020 Antwerp , Belgium
| | - J M Cadogan
- School of Physical, Environmental and Mathematical Sciences , UNSW Canberra at the Australian Defence Force Academy , Canberra , BC 2610 , Australia
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