1
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Qadir I, Sharma S, Manhas U, Atri AK, Singh S, Singh D. A new Ruddlesden-Popper oxide LaSr3Mn1.5Fe1.5O9.71 as photocatalyst for degrading highly toxic dyes in waste water: Structural, magnetic and transport properties. J SOLID STATE CHEM 2023. [DOI: 10.1016/j.jssc.2022.123675] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
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2
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Gong D, Yang J, Hao L, Horak L, Xin Y, Karapetrova E, Strempfer J, Choi Y, Kim JW, Ryan PJ, Liu J. Reconciling Monolayer and Bilayer J_{eff}=1/2 Square Lattices in Hybrid Oxide Superlattice. PHYSICAL REVIEW LETTERS 2022; 129:187201. [PMID: 36374692 DOI: 10.1103/physrevlett.129.187201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2022] [Revised: 08/08/2022] [Accepted: 09/26/2022] [Indexed: 06/16/2023]
Abstract
The number of atomic layers confined in a two-dimensional structure is crucial for the electronic and magnetic properties. Single-layer and bilayer J_{eff}=1/2 square lattices are well-known examples where the presence of the extra layer turns the XY anisotropy to the c-axis anisotropy. We report on experimental realization of a hybrid SrIrO_{3}/SrTiO_{3} superlattice that integrates monolayer and bilayer square lattices in one layered structure. By synchrotron x-ray diffraction, resonant x-ray magnetic scattering, magnetization, and resistivity measurements, we found that the hybrid superlattice exhibits properties that are distinct from both the single-layer and bilayer systems and cannot be explained by a simple addition of them. In particular, the entire hybrid superlattice orders simultaneously through a single antiferromagnetic transition at temperatures similar to the bilayer system but with all the J_{eff}=1/2 moments mainly pointing in the ab plane similar to the single-layer system. The results show that bringing monolayer and bilayer with orthogonal properties in proximity to each other in a hybrid superlattice structure is a powerful way to stabilize a unique state not obtainable in a uniform structure.
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Affiliation(s)
- Dongliang Gong
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - Junyi Yang
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - Lin Hao
- Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, HFIPS, Anhui, Chinese Academy of Sciences, Hefei 230031, China
| | - Lukas Horak
- Department of Condensed Matter Physics, Charles University, Ke Karlovu 3, Prague 12116, Czech Republic
| | - Yan Xin
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA
| | - Evguenia Karapetrova
- Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - Jörg Strempfer
- Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - Yongseong Choi
- Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - Jong-Woo Kim
- Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - Philip J Ryan
- Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - Jian Liu
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
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3
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Morita K, Kumagai Y, Oba F, Walsh A. Switchable Electric Dipole from Polaron Localization in Dielectric Crystals. PHYSICAL REVIEW LETTERS 2022; 129:017601. [PMID: 35841557 DOI: 10.1103/physrevlett.129.017601] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2022] [Accepted: 06/05/2022] [Indexed: 06/15/2023]
Abstract
Ferroelectricity in crystals is associated with the displacement of ions or rotations of polar units. Here we consider the dipole created by donor doping (D^{+}) and the corresponding bound polaron (e^{-}). A dipole of 6.15 Debye is predicted, from Berry phase analysis, in the Ruddlesden-Popper phase of Sr_{3}Ti_{2}O_{7}. A characteristic double-well potential is formed, which persists for high doping densities. The effective Hubbard U interaction can vary the defect state from metallic, a two-dimensional polaron, through to a zero-dimensional polaron. The ferroelectriclike behavior reported here is localized and distinct from conventional spontaneous lattice polarization.
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Affiliation(s)
- Kazuki Morita
- Department of Materials, Imperial College London, London SW7 2AZ, United Kingdom
| | - Yu Kumagai
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, Yokohama 226-8503, Japan
| | - Fumiyasu Oba
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, Yokohama 226-8503, Japan
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, Yokohama 226-8503, Japan
| | - Aron Walsh
- Department of Materials, Imperial College London, London SW7 2AZ, United Kingdom
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Korea
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4
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Clarke GRM, Lees MR, Ritter C, da Silva I, Senn MS. Synthesis and Characterization of Magnetoelectric Ba 7Mn 4O 15. Inorg Chem 2022; 61:10015-10022. [PMID: 35729687 PMCID: PMC9257749 DOI: 10.1021/acs.inorgchem.2c00889] [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] [Indexed: 11/29/2022]
Abstract
![]()
We present the synthesis
of a novel binary metal oxide material:
Ba7Mn4O15. The crystal structure
has been investigated by high-resolution powder synchrotron X-ray
diffraction in the temperature range of 100–300 K as well as
by powder neutron diffraction at 10 and 80 K. This material represents
an isostructural barium-substituted analogue of the layered material
Sr7Mn4O15 that forms its own structural
class. However, we find that Ba7Mn4O15 adopts a distinct magnetic ordering, resulting in a magnetoelectric
ground state below 50 K. The likely magnetoelectric coupling mechanisms
have been inferred from performing a careful symmetry-adapted refinement
against the powder neutron diffraction experiments, as well as by
making a comparison with the nonmagnetoelectric ground state of Sr7Mn4O15. The
synthesis, structural characterization, and magnetic
analysis of a novel solid-state phase, Ba7Mn4O15, are presented. While the high-temperature phase was
found to be isostructural to Sr7Mn4O15, a detailed symmetry-based analysis of low-temperature neutron powder
diffraction data, combined with magnetic susceptibility measurements,
reveals that Ba7Mn4O15 has a multiferroic
ground state.
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Affiliation(s)
| | - Martin R Lees
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K
| | | | - Ivan da Silva
- ISIS Neutron and Muon Facility, Rutherford Appleton Laboratory, Didcot OX11 0QX, U.K
| | - Mark S Senn
- Department of Chemistry, University of Warwick, Coventry CV4 7AL, U.K
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5
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Tarasova NA, Galisheva AO, Animitsa IE, Dmitrieva AA. The Effect of Donor Doping on the Ionic (О2–, Н+) Transport in Novel Complex Oxides BaLaIn1 – xNbxO4 + x with the Ruddlesden–Popper Structure. RUSS J ELECTROCHEM+ 2021. [DOI: 10.1134/s1023193521080115] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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6
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Hadded A, Massoudi J, Gharbi S, Dhahri E, Tozri A, Berber MR. Study of physical properties of a ferrimagnetic spinel Cu 1.5Mn 1.5O 4: spin dynamics, magnetocaloric effect and critical behavior. RSC Adv 2021; 11:25664-25676. [PMID: 35478869 PMCID: PMC9037015 DOI: 10.1039/d1ra03732c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Accepted: 07/13/2021] [Indexed: 11/21/2022] Open
Abstract
The present work reports a detailed study of the spin dynamics, magnetocaloric effect and critical behaviour near the magnetic phase transition temperature, of a ferrimagnetic spinel Cu1.5Mn1.5O4. The dynamic magnetic properties investigated using frequency-dependent ac magnetic susceptibility fitted using different phenomenological models such as Neel-Arrhenius, Vogel-Fulcher and power law, strongly indicate the presence of a cluster-glass-like behavior of Cu1.5Mn1.5O4 at 40 K. The magnetization data have revealed that our compound displays an occurrence of second-order paramagnetic (PM) to ferrimagnetic (FIM) phase transition at the Curie temperature T C = 80 K as the temperature decrease. In addition, the magnetic entropy change (ΔS M) was calculated using two different methods: Maxwell relations and Landau theory. An acceptable agreement was found between both sets of data, which proves the importance of both electron interaction and magnetoelastic coupling in the magnetocaloric effect (MCE) properties of Cu1.5Mn1.5O4. The relative cooling power (RCP) reaches 180.13 (J kg-1) for an applied field at 5 T, making our compound an effective candidate for magnetic refrigeration applications. The critical exponents β, γ and δ as well as transition temperature T C were extracted from various techniques indicating that the magnetic interaction in our sample follows the 3D-Ising model. The validity of the critical exponents is confirmed by applying the Windom scaling hypothesis.
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Affiliation(s)
- Abir Hadded
- Laboratoire de Physique Appliquée, Faculté des Sciences, Université de Sfax 3000 Tunisia
| | - Jalel Massoudi
- Laboratoire de Physique Appliquée, Faculté des Sciences, Université de Sfax 3000 Tunisia
| | - Sirine Gharbi
- Laboratoire de Physique Appliquée, Faculté des Sciences, Université de Sfax 3000 Tunisia
| | - Essebti Dhahri
- Laboratoire de Physique Appliquée, Faculté des Sciences, Université de Sfax 3000 Tunisia
| | - A Tozri
- Physics Department, College of Science, Jouf University Sakaka 2014 Saudi Arabia
| | - Mohamed R Berber
- Chemistry Department, College of Science, Jouf University Sakaka 2014 Saudi Arabia
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7
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Liu Y, Xu Z, Qiao K, Shen F, Xiao A, Wang J, Ma T, Hu F, Shen B. Electric field control of magnetism through modulating phase separation in (011)-Nd 0.5Sr 0.5MnO 3/PMN-PT heterostructures. NANOSCALE 2021; 13:8030-8037. [PMID: 33956930 DOI: 10.1039/d1nr00242b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Large and non-volatile electric field control of magnetization is promising to develop memory devices with reduced energy consumption. Herein, we report the electric field control of magnetization with a non-volatile memory effect in an intermediate band Nd0.5Sr0.5MnO3 film grown on a (011)-cut 0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3 (PMN-PT) single crystal. Applying an electric field across the ferroelectric PMN-PT increases the magnetization of the Nd0.5Sr0.5MnO3 film along both in-plane [100] and [011[combining macron]] directions. Moreover, the magnetization does not recover to its original state after withdrawal of the electric field at temperatures below 70 K, demonstrating a non-volatile memory effect. Detailed investigation showed that (011)-PMN-PT exhibits an anisotropic in-plane strain due to an electric field-induced rhombohedral to orthorhombic phase transition. This electric field-induced anisotropic strain can dynamically transfer to Nd0.5Sr0.5MnO3 film and modulate the magnetization of the Nd0.5Sr0.5MnO3 film through adjusting its phase balance between ferromagnetic (FM) and charge-orbital ordered antiferromagnetic (COO AFM) phases. The non-volatile memory effect can be ascribed to the competition of thermal energy and energy barriers between the FM and COO AFM phases at low temperatures. This work broadens the knowledge of electric field control of magnetism in the intermediate band-manganite ferromagnetic/ferroelectric multiferroic heterostructures, and may also pave a way for the control of antiferromagnetism and to design antiferromagnet-based memories.
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Affiliation(s)
- Yao Liu
- Frontier Institute of Science and Technology and State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710054, China.
| | - Zhitong Xu
- Frontier Institute of Science and Technology and State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710054, China.
| | - Kaiming Qiao
- Beijing National Laboratory for Condensed Matter Physics and State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
| | - Feiran Shen
- Beijing National Laboratory for Condensed Matter Physics and State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China. and Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
| | - Andong Xiao
- Frontier Institute of Science and Technology and State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710054, China.
| | - Jing Wang
- Beijing National Laboratory for Condensed Matter Physics and State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China. and Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
| | - Tianyu Ma
- Frontier Institute of Science and Technology and State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710054, China.
| | - Fengxia Hu
- Beijing National Laboratory for Condensed Matter Physics and State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China. and Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
| | - Baogen Shen
- Beijing National Laboratory for Condensed Matter Physics and State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China. and Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
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8
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Lee J, Kim Y, Cho J, Ohta H, Jeen H. Overlayer deposition-induced control of oxide ion concentration in SrFe 0.5Co 0.5O 2.5 oxygen sponges. RSC Adv 2021; 11:32210-32215. [PMID: 35495523 PMCID: PMC9041705 DOI: 10.1039/d1ra06378b] [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: 08/23/2021] [Accepted: 09/22/2021] [Indexed: 11/21/2022] Open
Abstract
Controlling the oxide ion (O2−) concentration in oxides is essential to develop advanced ionic devices, i.e. solid oxide fuel cells, smart windows, memory devices, energy storage devices, and so on. Among many oxides several transition metal (TM)-based perovskite oxides show high oxide ion conductivity, and their physical properties show high sensitivity to the change of the oxide ion concentration. Here, the change in the oxide ion concentration is shown through the overlayer deposition on the SrFe0.5Co0.5O2.5 (SFCO) oxygen sponge film. We grew SFCO films followed by the deposition of two kinds of complex oxide films under exactly the same growth conditions, and observed the changes in the crystal structure, valence states, and magnetic ground states. As the NSMO overlayer grows, strong evidence of oxidation at the O K edge is shown. In addition, the Fe4+ feature is revealed, and the electron valence state of Co increased from 3 to 3.25. The oxide ion concentration of SFCO changes during layer growth due to oxidation or reduction due to differences in chemical potential. The present results might be useful to develop advanced ionic devices using TM-based perovskite oxides. We form flat oxide-interfaces, i.e. manganite- and titanate-oxygen sponges, and observe peculiar oxygen transport behaviors relying on chemical potential difference at the interfaces. Oxygen transport into oxygen-sponge leads weak ferromagnetism.![]()
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Affiliation(s)
- Joonhyuk Lee
- Department of Physics, Pusan National University, Busan 46241, Korea
| | - Younghak Kim
- Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang 37673, Korea
| | - Jinhyung Cho
- Department of Physics Education, Pusan National University, Busan 46241, Korea
| | - Hiromichi Ohta
- Research Institute for Electronic Science, Hokkaido University, Sapporo 001-0020, Japan
| | - Hyoungjeen Jeen
- Department of Physics, Pusan National University, Busan 46241, Korea
- Research Center for Dielectric and Advanced Matter Physics, Pusan National University, Busan 46241, Korea
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9
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Hosseini M, Vanpoucke DEP, Giannozzi P, Berahman M, Hadipour N. Investigation of structural, electronic and magnetic properties of breathing metal–organic framework MIL-47(Mn): a first principles approach. RSC Adv 2020; 10:4786-4794. [PMID: 35495241 PMCID: PMC9049066 DOI: 10.1039/c9ra09196c] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2019] [Accepted: 01/23/2020] [Indexed: 11/21/2022] Open
Abstract
The structural, electronic and magnetic properties of the MIL-47(Mn) metal–organic framework are investigated using first principles calculations. We find that the large-pore structure is the ground state of this material. We show that upon transition from the large-pore to the narrow-pore structure, the magnetic ground-state configuration changes from antiferromagnetic to ferromagnetic, consistent with the computed values of the intra-chain coupling constant. Furthermore, the antiferromagnetic and ferromagnetic configuration phases have intrinsically different electronic behavior: the former is semiconducting, the latter is a metal or half-metal. The change of electronic properties during breathing posits MIL-47(Mn) as a good candidate for sensing and other applications. Our calculated electronic band structure for MIL-47(Mn) presents a combination of flat dispersionless and strongly dispersive regions in the valence and conduction bands, indicative of quasi-1D electronic behavior. The spin coupling constants are obtained by mapping the total energies onto a spin Hamiltonian. The inter-chain coupling is found to be at least one order of magnitude smaller than the intra-chain coupling for both large and narrow pores. Interestingly, the intra-chain coupling changes sign and becomes five times stronger going from the large pore to the narrow pore structure. As such MIL-47(Mn) could provide unique opportunities for tunable low-dimensional magnetism in transition metal oxide systems. The structural, electronic and magnetic properties of the MIL-47(Mn) metal–organic framework are investigated using first principles calculations.![]()
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Affiliation(s)
| | | | - Paolo Giannozzi
- Dipartimento di Scienze Matematiche
- Informatiche e Fisiche
- Università degli Studi di Udine
- 33100 Udine
- Italy
| | - Masoud Berahman
- Department of Electrical and Computer Engineering
- Advanced Graduate University of Technology
- Kerman
- Iran
| | - Nasser Hadipour
- Department of Physical Chemistry
- Tarbiat Modares University
- Tehran
- Iran
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10
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Vecino‐Mantilla S, Gauthier‐Maradei P, Huvé M, Serra JM, Roussel P, Gauthier GH. Nickel Exsolution‐Driven Phase Transformation from an n=2 to an n=1 Ruddlesden‐Popper Manganite for Methane Steam Reforming Reaction in SOFC Conditions. ChemCatChem 2019. [DOI: 10.1002/cctc.201901002] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Sebastián Vecino‐Mantilla
- Grupo de investigación INTERFASE Escuela de Ingeniería QuímicaUniversidad Industrial de Santander Bucaramanga 680002 Colombia
- Instituto de Tecnología QuímicaUniversitat Politècnica de València Consejo Superior de Investigaciones Científicas Valencia 46022 Spain
| | - Paola Gauthier‐Maradei
- Grupo de investigación INTERFASE Escuela de Ingeniería QuímicaUniversidad Industrial de Santander Bucaramanga 680002 Colombia
| | - Marielle Huvé
- Université de Lille CNRS, Centrale Lille ENSCL, Université d'Artois UMR 8181 - UCCS - Unité de Catalyse et Chimie du Solide Lille F- 59000 France
| | - José Manuel Serra
- Instituto de Tecnología QuímicaUniversitat Politècnica de València Consejo Superior de Investigaciones Científicas Valencia 46022 Spain
| | - Pascal Roussel
- Université de Lille CNRS, Centrale Lille ENSCL, Université d'Artois UMR 8181 - UCCS - Unité de Catalyse et Chimie du Solide Lille F- 59000 France
| | - Gilles H. Gauthier
- Grupo de investigación INTERFASE Escuela de Ingeniería QuímicaUniversidad Industrial de Santander Bucaramanga 680002 Colombia
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11
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Pham A, Li S. Engineering the strongly correlated properties of bulk Ruddlesden-Popper transition metal oxides via self-doping. Phys Chem Chem Phys 2017; 19:11373-11379. [PMID: 28422209 DOI: 10.1039/c7cp01700f] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We demonstrate via first-principles calculations a novel method of tuning the electron-electron interactions in bulk oxide materials via controlling the cationic layer arrangement. Using the Ruddlesden-Popper oxides LaSrMnO4 and LaSrTiO4 as examples, our study demonstrates that a self-doping effect can be induced by changing the stacking of the neutral and charged cationic layers. It is believed that such a phenomenon is associated with different movements of apical oxygen atoms, resulting in diverse bandgaps, magnetism and orbital degrees of freedom in the same stoichiometric strongly-correlated material. This finding may open up a new direction to engineer the transition metal oxides for practical applications requiring tunable electronic properties without external doping.
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Affiliation(s)
- Anh Pham
- School of Materials Science and Engineering, The University of New South Wales, Sydney, NSW 2052, Australia.
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12
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Tajima S. Optical studies of high-temperature superconducting cuprates. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2016; 79:094001. [PMID: 27472654 DOI: 10.1088/0034-4885/79/9/094001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The optical studies of high-temperature superconducting cuprates (HTSC) are reviewed. From the doping dependence of room temperature spectra, a dramatic change of the electronic state from a Mott (charge transfer) insulator to a Fermi liquid has been revealed. Additionally, the unusual 2D nature of the electronic state has been found. The temperature dependence of the optical spectra provided a rich source of information on the pseudogap, superconducting gap, Josephson plasmon, transverse Josephson plasma mode and precursory superconductivity. Among these issues, Josephson plasmons and transverse Josephson plasma mode were experimentally discovered by optical measurements, and thus are unique to HTSC. The effect of the spin/charge stripe order is also unique to HTSC, reflecting the conducting nature of the stripe order in this system. The pair-breaking due to the stripe order seems stronger in the out-of-plane direction than in the in-plane one.
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Affiliation(s)
- Setsuko Tajima
- Department of Physics, Osaka University, Osaka 560-0043, Japan
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13
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Terahertz field control of in-plane orbital order in La(0.5)Sr(1.5)MnO4. Nat Commun 2015; 6:8175. [PMID: 26381700 PMCID: PMC4595605 DOI: 10.1038/ncomms9175] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Accepted: 07/27/2015] [Indexed: 11/20/2022] Open
Abstract
In-plane anisotropic ground states are ubiquitous in correlated solids such as pnictides, cuprates and manganites. They can arise from doping Mott insulators and compete with phases such as superconductivity; however, their origins are debated. Strong coupling between lattice, charge, orbital and spin degrees of freedom results in simultaneous ordering of multiple parameters, masking the mechanism that drives the transition. Here we demonstrate that the orbital domains in a manganite can be oriented by the polarization of a pulsed THz light field. Through the application of a Hubbard model, we show that domain control can be achieved by enhancing the local Coulomb interactions, which drive domain reorientation. Our results highlight the key role played by the Coulomb interaction in the control and manipulation of orbital order in the manganites and demonstrate a new way to use THz to understand and manipulate anisotropic phases in a potentially broad range of correlated materials. Numerous correlated materials exhibit an in-plane anisotropic ground state but their origin is unclear. Here the authors control the orientation of orbital domains in a manganite using the polarization of terahertz pulses, which can be explained by field-induced enhancement of the electron interactions.
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14
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Structural, electrical, and magnetic characterization of oxygen-deficient manganite La0.5Sr1.5Mn0.5Cr0.5O4-δ obtained by citrate precursor method. MONATSHEFTE FUR CHEMIE 2014. [DOI: 10.1007/s00706-013-1088-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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15
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Synthesis, magnetic and electric transport properties of mixed-valence manganites La0.5+xSr1.5−xMn0.5Cr0.5O4 (x=0.1, 0.2 and 0.3). J SOLID STATE CHEM 2013. [DOI: 10.1016/j.jssc.2013.09.016] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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16
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Tsujimoto Y, Yamaura K, Uchikoshi T. Extended Ni(III) Oxyhalide Perovskite Derivatives: Sr2NiO3X (X = F, Cl). Inorg Chem 2013; 52:10211-6. [DOI: 10.1021/ic402008n] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yoshihiro Tsujimoto
- Materials Processing Unit, National Institute for Materials Science, 1-2-1 Sengen,
Tsukuba, Ibaraki 305-0047, Japan
| | - Kazunari Yamaura
- Superconducting Materials Unit, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044,
Japan
| | - Tetsuo Uchikoshi
- Materials Processing Unit, National Institute for Materials Science, 1-2-1 Sengen,
Tsukuba, Ibaraki 305-0047, Japan
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17
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Demont A, Pelloquin D, Hébert S, Hervieu M, Höwing J, Maignan A. Sr7Co4(CO3)O(13-δ) (δ = 1.64), an original cobaltite derivative of the Ruddlesden-Popper series. Inorg Chem 2013; 52:4977-84. [PMID: 23560548 DOI: 10.1021/ic3026232] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The oxycarbonate Sr7Co4(CO3)O11.36 exhibits a peculiar structure that has been characterized by combining transmission electron microscopy analyses and neutron diffraction. It consists of a regular intergrowth between the m = 2 and carbonated m = 3 members of the Sr(m+1)Co(m)O3(m+1) Ruddlesden-Popper (RP) series, Sr3Co2O5.87 and Sr4Co2(CO3)O5.49, respectively. A description of the structure is proposed to provide identification of the different building blocks. This material is semiconducting and presents a complex magnetic behavior, characteristic of what is observed for the RP(2) or RP(3) series, with a cobalt valency close to 2.7.
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Affiliation(s)
- A Demont
- Laboratoire CRISMAT, UMR CNRS-ENSI Caen 6508, 6 bd Maréchal Juin, 14050 Caen Cedex, France
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18
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Tobey R, Wall S, Först M, Bromberger H, Khanna V, Turner J, Schlotter W, Trigo M, Krupin O, Lee WS, Chuang YD, Moore R, Cavalieri A, Wilkins SB, Zeng H, Mitchell JF, Dhesi S, Cavalleri A, Hill JP. Measuring 3D magnetic correlations during the photo-induced melting of electronic order in La 0.5Sr 1.5MnO 4. EPJ WEB OF CONFERENCES 2013. [DOI: 10.1051/epjconf/20134103003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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19
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García J, Herrero-Martín J, Subías G, Blasco J, Andreu JS, Concepción Sánchez M. Incommensurate sinusoidal oxygen modulations in layered manganites La(1-x)Sr(1+x)MnO4 (x≥0.5). PHYSICAL REVIEW LETTERS 2012; 109:107202. [PMID: 23005321 DOI: 10.1103/physrevlett.109.107202] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2012] [Indexed: 06/01/2023]
Abstract
We have studied the incommensurate-ordered phase in overdoped La0.4Sr1.6MnO4 by resonant x-ray diffraction at the Mn K edge. Weak resonant superlattice (h±0.2 h±0.2 0) and (h±0.4 h±0.4 0) reflections of the tetragonal structure were found below ~240 K. The energy, azimuth angle, and polarization dependencies of the resonant scattering have revealed sinusoidal modulations of the oxygen motions that are transverse and longitudinal to the tetragonal [110] direction. This result discards (Mn(3+),Mn(4+))-like stripe-type order but point to a charge-density-modulation picture.
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Affiliation(s)
- Joaquín García
- Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, Zaragoza, Spain.
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20
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Palgrave R, Borisov P, Dyer MS, McMitchell SRC, Darling GR, Claridge JB, Batuk M, Tan H, Tian H, Verbeeck J, Hadermann J, Rosseinsky MJ. Artificial construction of the layered Ruddlesden-Popper manganite La2Sr2Mn3O10 by reflection high energy electron diffraction monitored pulsed laser deposition. J Am Chem Soc 2012; 134:7700-14. [PMID: 22463768 PMCID: PMC3699890 DOI: 10.1021/ja211138x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2011] [Indexed: 11/28/2022]
Abstract
Pulsed laser deposition has been used to artificially construct the n = 3 Ruddlesden-Popper structure La(2)Sr(2)Mn(3)O(10) in epitaxial thin film form by sequentially layering La(1-x)Sr(x)MnO(3) and SrO unit cells aided by in situ reflection high energy electron diffraction monitoring. The interval deposition technique was used to promote two-dimensional SrO growth. X-ray diffraction and cross-sectional transmission electron microscopy indicated that the trilayer structure had been formed. A site ordering was found to differ from that expected thermodynamically, with the smaller Sr(2+) predominantly on the R site due to kinetic trapping of the deposited cation sequence. A dependence of the out-of-plane lattice parameter on growth pressure was interpreted as changing the oxygen content of the films. Magnetic and transport measurements on fully oxygenated films indicated a frustrated magnetic ground state characterized as a spin glass-like magnetic phase with the glass temperature T(g) ≈ 34 K. The magnetic frustration has a clear in-plane (ab) magnetic anisotropy, which is maintained up to temperatures of 150 K. Density functional theory calculations suggest competing antiferromagnetic and ferromagnetic long-range orders, which are proposed as the origin of the low-temperature glassy state.
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Affiliation(s)
- Robert
G. Palgrave
- Department of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD,
United Kingdom
| | - Pavel Borisov
- Department of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD,
United Kingdom
| | - Matthew S. Dyer
- Department of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD,
United Kingdom
| | - Sean R. C. McMitchell
- Department of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD,
United Kingdom
| | - George R. Darling
- Department of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD,
United Kingdom
| | - John B. Claridge
- Department of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD,
United Kingdom
| | - Maria Batuk
- EMAT, University
of Antwerp, Groenenborgerlaan 171, B-2020, Antwerp,
Belgium
| | - Haiyan Tan
- EMAT, University
of Antwerp, Groenenborgerlaan 171, B-2020, Antwerp,
Belgium
| | - He Tian
- EMAT, University
of Antwerp, Groenenborgerlaan 171, B-2020, Antwerp,
Belgium
| | - Jo Verbeeck
- EMAT, University
of Antwerp, Groenenborgerlaan 171, B-2020, Antwerp,
Belgium
| | - Joke Hadermann
- EMAT, University
of Antwerp, Groenenborgerlaan 171, B-2020, Antwerp,
Belgium
| | - Matthew J. Rosseinsky
- Department of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD,
United Kingdom
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21
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Seetha Lakshmi L, Nigam AK. Suppression of itinerant ferromagnetism and a spin-glass-like state in Zn substituted La0.67Ca0.33MnO3. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2011; 23:086006. [PMID: 21411909 DOI: 10.1088/0953-8984/23/8/086006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We examine the magneto-transport, static and dynamic magnetic responses of the single phase glassy insulating compound La(0.67)Ca(0.33)Mn(1-x)Zn(x)O(3) (x = 0.10). This compound undergoes a field induced metal-insulator transition and exhibits colossal magnetoresistance for H ≥ 2 T. Many experimental features, such as a frequency dependent cusp in the in-phase component of linear ac susceptibility at a temperature T'(f), a broad maximum (at T(a)) in the ZFC cooled thermo-magnetization close to T'(f), large thermo-magnetic irreversibility below T(a), non-saturation of magnetization at 5 K even under 12 T with a characteristic S shape in the virgin curve, monotonic increase of the coercivity at low fields under ZFC condition as one approaches the T'(f), logarithmic relaxation of thermo-magnetization and ageing effects below T(a) and a characteristic maximum in the magnetic viscosity below the spin-glass transition temperature (T(g)) indicate a spin-glass-like state at low temperatures. This is further substantiated by the absence of second order non-linear ac susceptibility, a characteristic negative maximum at T(g) in third order non-linear ac susceptibility (χ'(3)), the critical divergence of χ'(3) as a function of temperature and ac probe field and an unusually large linear term in the low temperature specific heat.
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Affiliation(s)
- L Seetha Lakshmi
- Low Temperature Physics, Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Coloba, Mumbai 400 005, India.
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22
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Cortés-Gil R, Ruiz-González ML, Alonso JM, García-Hernández M, Hernando A, Vallet-Regí M, González-Calbet JM. Magnetoresistance in La0.5Sr0.5MnO2.5. Chemistry 2011; 17:2709-15. [PMID: 21264962 DOI: 10.1002/chem.201002080] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2010] [Indexed: 11/06/2022]
Abstract
Resistance measurements indicate the presence of magnetoresistance in the La(0.5)Sr(0.5)MnO(2.5) brownmillerite related compound. An 80 % of magnetoresistance is found at 75 K. In spite of the partial break-up occurring at the 3D network of octahedra sharing corners, characteristic of the full oxygen content perovskite phase, the oxygen deficient compound exhibits complex magnetic and electric properties. Such behavior can be explained on the basis of ferromagnetic and metallic clusters randomly distributed at the octahedral layers separated from each other by an insulating antiferromagnetic matrix. AC susceptibility measurements suggest spin glass behavior at low temperature as a consequence of the competition between different magnetic interactions.
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Affiliation(s)
- Raquel Cortés-Gil
- Departamento de Química Inorgánica, UCM, Facultad de Químicas, Universidad Complutense, Madrid, Spain
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23
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Rościszewski K, Oleś AM. Jahn-Teller distortions and the magnetic order in the perovskite manganites. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2010; 22:425601. [PMID: 21403311 DOI: 10.1088/0953-8984/22/42/425601] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We introduce an effective model for e(g) electrons to describe three-dimensional perovskite (La(1 - x)Sr(x)MnO(3) and La(1 - x)Ca(x)MnO(3)) manganites and study the magnetic and orbital order on a 4 × 4 × 4 cluster using correlated wavefunctions. The model includes the kinetic energy, and on-site Coulomb interactions for e(g) electrons, antiferromagnetic superexchange interaction between S = 3/2 core spins, and the coupling between e(g) electrons and Jahn-Teller modes. The model reproduces the experimentally observed magnetic order: (i) an A-type antiferromagnetic phase in the undoped insulator LaMnO(3), with alternating e(g) orbitals and with small Jahn-Teller distortions, changing to a conducting phase at 32 GPa pressure, and (ii) ferromagnetic order in one-eighth-doped La(7/8)Sr(1/8)MnO(3) and in quarter-doped La(3/4)Sr(1/4)MnO(3) compounds. For half-doped La(1/2)Ca(1/2)MnO(3) one finds a competition between a ferromagnetic conductor and the CE insulating phase; the latter is stabilized by the Jahn-Teller coupling being two times larger than for the strontium-doped compound. Altogether, there is a subtle balance between all Hamiltonian parameters and the phase diagram is quite sensitive to the precise values they take.
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Affiliation(s)
- Krzysztof Rościszewski
- Marian Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, Kraków, Poland.
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24
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Evtushinsky DV, Inosov DS, Urbanik G, Zabolotnyy VB, Schuster R, Sass P, Hänke T, Hess C, Büchner B, Follath R, Reutler P, Revcolevschi A, Kordyuk AA, Borisenko SV. Bridging charge-orbital ordering and Fermi surface instabilities in half-doped single-layered manganite La(0.5)Sr(1.5)MnO₄. PHYSICAL REVIEW LETTERS 2010; 105:147201. [PMID: 21230862 DOI: 10.1103/physrevlett.105.147201] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2008] [Revised: 06/25/2010] [Indexed: 05/30/2023]
Abstract
The single-layered half-doped manganite La(0.5)Sr(1.5)MnO₄ (LSMO), was studied by means of the angle-resolved photoemission spectroscopy (ARPES), scanning tunneling microscopy (STM), and resistivity measurements. STM revealed a smooth reconstruction-free surface; the density of states, extracted from photoemission and tunneling spectroscopy, is in agreement with transport measurements. The derived from ARPES Fermi surface (FS) nesting properties correspond to the known pattern of the charge-orbital ordering (COO), which implies that FS instability is related to the propensity to form a COO state in LSMO.
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Affiliation(s)
- D V Evtushinsky
- Institute for Solid State Research, IFW Dresden, Post Office Box 270116, D-01171 Dresden, Germany
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25
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Katakura I, Tokunaga M, Matsuo A, Kawaguchi K, Kindo K, Hitomi M, Akahoshi D, Kuwahara H. Development of high-speed polarizing imaging system for operation in high pulsed magnetic field. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2010; 81:043701. [PMID: 20441339 DOI: 10.1063/1.3359954] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
A high-speed polarizing microscope system combined with a 37 T pulse magnet has been developed. This system was applied to successfully visualize the field-induced collapse of charge-orbital ordering in a layered manganite La(1/2)Sr(3/2)MnO(4). Quantitative analyses of the obtained polarizing microscope images provided clear evidence of this transition in contrast to rather moderate changes in magnetization and magnetoresistance. The ability of this system to carry out quantitative analysis was further tested through the observation of Faraday rotation in a Tb(3)Ga(5)O(12) crystal. The Verdet constant determined from the polarizing images is in reasonable agreement with that in literature. Local intensity analyses of the images indicate that we can investigate magneto-optical signals within an accuracy of 0.85% in an area of 9.6 x 9.6 microm(2).
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Affiliation(s)
- I Katakura
- The Institute for Solid State Physics, The University of Tokyo, Kashiwa 277-8581, Japan
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26
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Rout GC, Panda S. Microscopic theory of longitudinal sound velocity in charge ordered manganites. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2009; 21:416001. [PMID: 21693999 DOI: 10.1088/0953-8984/21/41/416001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A microscopic theory of longitudinal sound velocity in a manganite system is reported here. The manganite system is described by a model Hamiltonian consisting of charge density wave (CDW) interaction in the e(g) band, an exchange interaction between spins of the itinerant e(g) band electrons and the core t(2g) electrons, and the Heisenberg interaction of the core level spins. The magnetization and the CDW order parameters are considered within mean-field approximations. The phonon Green's function was calculated by Zubarev's technique and hence the longitudinal velocity of sound was finally calculated for the manganite system. The results show that the elastic spring involved in the velocity of sound exhibits strong stiffening in the CDW phase with a decrease in temperature as observed in experiments.
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Affiliation(s)
- G C Rout
- Condensed Matter Physics Group, PG Department of Applied Physics and Ballistics, FM University, Balasore 756 019, India
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27
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Rościszewski K, Oleś AM. Interplay between the orbital and magnetic order in monolayer La(1-x)Sr(1+x)MnO(4) manganites. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2007; 19:186223. [PMID: 21691004 DOI: 10.1088/0953-8984/19/18/186223] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A two-dimensional model which describes e(g) electrons in a monolayer of an undoped and half doped manganite La(1-x)Sr(1+x)MnO(4) is studied using correlated wavefunctions. The effective Hamiltonian takes into account the kinetic energy, the crystal field splitting between x(2)-y(2) and 3z(2)-r(2) orbitals, and on-site Coulomb interactions for e(g) electrons. They interact with S = 3/2 spins due to t(2g) electrons, which are treated as frozen core spins. Furthermore, the model includes antiferromagnetic superexchange interaction between core spins, and the coupling between e(g) electrons and Jahn-Teller modes. The model reproduces the antiferromagnetic order in the undoped LaSrMnO(4) compound, with occupied 3z(2)-r(2) orbitals and elongated MnO(6) octahedra along the direction perpendicular to the Mn-O plane. In half doped La(0.5)Sr(1.5)MnO(4) manganite one finds robust chequerboard-like charge order using realistic parameters. However, the experimentally observed CE phase is more difficult to stabilize, and we discuss the necessary conditions to obtain it within the present model. Altogether, we conclude that the Jahn-Teller effect plays a crucial role in the entire regime of doping.
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Affiliation(s)
- Krzysztof Rościszewski
- Marian Smoluchowski Institute of Physics, Jagellonian University, Reymonta 4, PL-30059 Kraków, Poland
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28
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Tokunaga Y, Lottermoser T, Lee Y, Kumai R, Uchida M, Arima T, Tokura Y. Rotation of orbital stripes and the consequent charge-polarized state in bilayer manganites. NATURE MATERIALS 2006; 5:937-41. [PMID: 17086170 DOI: 10.1038/nmat1773] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2006] [Accepted: 09/19/2006] [Indexed: 05/12/2023]
Abstract
Nanoscale self-organization of electrons is ubiquitously observed in correlated electron systems such as complex oxides of transition metals. The phenomenon of charge ordering (CO) or the formation of charge stripes, as observed for layered-structure cuprates and nickelates, is one such example. Among them, CO in manganites is closely tied to the orbital degree of freedom of 3d electrons, leading to staggered orbital ordering or the formation of orbital stripes in the layered structure. Here, we describe the phenomena of thermally induced rotation of the orbital stripes by 90( composite function) for bilayered manganite crystals with half hole doping, that is, a 1:1 ratio of Mn3+/Mn4+. The rotation of orbital stripes and the consequent CO coupled with the underlying lattice distortion were found to produce the charge-polarized state, as also shown by its optical second-harmonic generation activity.
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Affiliation(s)
- Yusuke Tokunaga
- Spin Superstructure Project, ERATO, Japan Science and Technology Agency (JST), Tsukuba, Ibaraki 305-8562, Japan.
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29
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Malavasi L, Mozzati MC, Ritter C, Pomjakushin V, Tealdi C, Azzoni CB, Flor G. Doping effects in single-layered La0.5Sr1.5MnO4 manganite. J Phys Chem B 2006; 110:17430-6. [PMID: 16942081 DOI: 10.1021/jp063384+] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In this paper we report the results of the synthesis and structural, transport, and magnetic characterization of pure La(0.5)Sr(1.5)MnO(4) and B-site lightly doped samples, i.e. La(0.5)Sr(1.5)Mn(0.95)B(0.05)O(4), where B = Ru, Co, and Ni. The choice was made in order to probe the charge ordering/orbital ordering ground state of the monolayered La(0.5)Sr(1.5)MnO(4) manganite as a consequence of the cation doping. It is shown that even a light doping is successful in suppressing the charge and orbital order found in pure La(0.5)Sr(1.5)MnO(4). No long-range magnetic order has been detected in any of the doped samples but the setup of a spin-glass state with a common freezing temperature ( approximately 22 K). Structural parameters show an anisotropy in the lattice constant variation, with the tetragonal distortion increasing as the cell volume reduces, which may suggest a variation in the orbital character of the e(g) electrons along with the overall cation size.
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Affiliation(s)
- Lorenzo Malavasi
- Dipartimento di Chimica Fisica M. Rolla, INSTM, Università di Pavia, Via le Taramelli 16, I-27100, Pavia, Italy.
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30
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Senff D, Krüger F, Scheidl S, Benomar M, Sidis Y, Demmel F, Braden M. Spin-wave dispersion in orbitally ordered La1/2Sr3/2MnO4. PHYSICAL REVIEW LETTERS 2006; 96:257201. [PMID: 16907336 DOI: 10.1103/physrevlett.96.257201] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2005] [Indexed: 05/11/2023]
Abstract
The magnon dispersion in the charge, orbital, and spin ordered phase in La1/2Sr3/2MnO4 has been studied by means of inelastic neutron scattering. We find excellent agreement with a magnetic interaction model based on the CE-type superstructure. The magnetic excitations are dominated by ferromagnetic exchange parameters revealing a nearly one-dimensional character at high energies. The strong ferromagnetic interaction in the charge or orbital ordered phase appears to be essential for the capability of manganites to switch between metallic and insulating phases.
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Affiliation(s)
- D Senff
- II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
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31
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Matsuno J, Okimoto Y, Fang Z, Yu XZ, Matsui Y, Nagaosa N, Kawasaki M, Tokura Y. Metallic ferromagnet with square-lattice CoO2 sheets. PHYSICAL REVIEW LETTERS 2004; 93:167202. [PMID: 15525025 DOI: 10.1103/physrevlett.93.167202] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2004] [Indexed: 05/24/2023]
Abstract
A single-crystalline film of Sr2CoO4 with square-lattice CoO2 sheets (K2NiF4-type structure) was synthesized, and its electronic properties were characterized. The compound exhibited both ferromagnetic and metallic behaviors, with a fairly high Curie temperature T(C) of approximately 250 K, in contrast to the superconductivity recently found in a triangular-lattice CoO2-sheet compound. The film's large magnetoresistance with current perpendicular to the CoO2 plane showed field-hysteretic behavior analogous to tunneling magnetoresistance. The electronic structure of Sr2CoO4 was also investigated to characterize the quasi-two-dimensional ferromagnetic metal state in terms of optical spectroscopy and first-principles calculation.
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Affiliation(s)
- J Matsuno
- Correlated Electron Research Center, National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8562, Japan.
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32
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Thomas KJ, Hill JP, Grenier S, Kim YJ, Abbamonte P, Venema L, Rusydi A, Tomioka Y, Tokura Y, McMorrow DF, Sawatzky G, van Veenendaal M. Soft x-ray resonant diffraction study of magnetic and orbital correlations in a manganite near half doping. PHYSICAL REVIEW LETTERS 2004; 92:237204. [PMID: 15245194 DOI: 10.1103/physrevlett.92.237204] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2003] [Indexed: 05/24/2023]
Abstract
We have utilized resonant x-ray diffraction at the Mn L(II,III) edges in order to directly compare magnetic and orbital correlations in Pr0.6Ca0.4MnO3. Comparing the widths of the magnetic and orbital diffraction peaks, we find that the magnetic correlation length exceeds that of the orbital order by nearly a factor of 2. Furthermore, we observe a large (approximately 3 eV) spectral weight shift between the magnetic and orbital resonant line shapes, which cannot be explained within the classic Goodenough picture of a charge-ordered ground state. To explain the shift, we calculate the orbital and magnetic resonant diffraction line shapes based on a relaxed charge-ordered model.
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Affiliation(s)
- K J Thomas
- Department of Physics, Brookhaven National Laboratory, Upton, New York 11973, USA
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33
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Huang DJ, Wu WB, Guo GY, Lin HJ, Hou TY, Chang CF, Chen CT, Fujimori A, Kimura T, Huang HB, Tanaka A, Jo T. Orbital ordering in La0.5Sr1.5MnO4 studied by soft X-ray linear dichroism. PHYSICAL REVIEW LETTERS 2004; 92:087202. [PMID: 14995808 DOI: 10.1103/physrevlett.92.087202] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2003] [Revised: 11/17/2003] [Indexed: 05/24/2023]
Abstract
We found that the conventional model of orbital-ordering of 3x(2)-r(2)/3y(2)-r(2) type in the e(g) states of La0.5Sr1.5MnO4 is incompatible with measurements of linear dichroism in the Mn 2p-edge x-ray absorption, whereas these e(g) states exhibit predominantly cross-type orbital ordering of x(2)-z(2)/y(2)-z(2). LDA+U band-structure calculations reveal that such a cross-type orbital-ordering results from a combined effect of antiferromagnetic structure, Jahn-Teller distortion, and on-site Coulomb interactions.
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Affiliation(s)
- D J Huang
- National Synchrotron Radiation Research Center, Hsinchu 30077, Taiwan
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34
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Dhesi SS, Mirone A, De Nadaï C, Ohresser P, Bencok P, Brookes NB, Reutler P, Revcolevschi A, Tagliaferri A, Toulemonde O, van der Laan G. Unraveling orbital ordering in La0.5Sr1.5MnO4. PHYSICAL REVIEW LETTERS 2004; 92:056403. [PMID: 14995324 DOI: 10.1103/physrevlett.92.056403] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2003] [Indexed: 05/24/2023]
Abstract
Orbital ordering (OO) in the layered perovskite La0.5Sr1.5MnO4 has been investigated using the enhanced sensitivity of soft x-ray resonant diffraction at the Mn L edges. The energy dependence of an OO diffraction peak over the L(2,3) edges is compared to ligand-field calculations allowing a distinction between the influences of Jahn-Teller distortions and spin correlations. The energy dependence of the diffraction peak at the Mn L1 edge is remarkably different from that observed at the Mn K edge.
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Affiliation(s)
- S S Dhesi
- Diamond Light Source, Chilton, Didcot OX11 0QX, United Kingdom.
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35
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Wilkins SB, Spencer PD, Hatton PD, Collins SP, Roper MD, Prabhakaran D, Boothroyd AT. Direct observation of orbital ordering in La0.5Sr1.5MnO4 using soft x-ray diffraction. PHYSICAL REVIEW LETTERS 2003; 91:167205. [PMID: 14611437 DOI: 10.1103/physrevlett.91.167205] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2003] [Indexed: 05/24/2023]
Abstract
We report the first direct resonant soft x-ray scattering observations of orbital ordering. We have studied the low temperature phase of La0.5Sr1.5MnO4, a compound that displays charge and orbital ordering. Previous claims of orbital ordering in such materials have relied on observations at the manganese K edge. These claims have been questioned in several theoretical studies. Instead we have employed resonant soft x-ray scattering at the manganese L(III) and L(II) edges which probes the orbital ordering directly. Energy scans at constant wave vector are compared to theoretical predictions and suggest that at all temperatures there are two separate contributions to the scattering: direct orbital ordering and strong cooperative Jahn-Teller distortions of the Mn3+ ions.
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Affiliation(s)
- S B Wilkins
- Department of Physics, University of Durham, Rochester Building, South Road, Durham, DH1 3LE, United Kingdom.
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36
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Metal-Insulator Transition Induced by Short Range Magnetic Ordering in Mono-layered Manganite. B KOREAN CHEM SOC 2003. [DOI: 10.5012/bkcs.2003.24.5.573] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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37
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Ibarra M, Retoux R, Hervieu M, Autret C, Maignan A, Martin C, Raveau B. Charge–orbital ordering above room temperature in the 2D Pr1−xCa1+xMnO4 manganites. J SOLID STATE CHEM 2003. [DOI: 10.1016/s0022-4596(02)00124-x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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38
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Popović Z, Satpathy S. Origin of charge-orbital order in the half-doped manganites. PHYSICAL REVIEW LETTERS 2002; 88:197201. [PMID: 12005660 DOI: 10.1103/physrevlett.88.197201] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2001] [Indexed: 05/23/2023]
Abstract
The microscopic origin of the charge and orbital order in the half-doped manganites is examined from ab initio density-functional calculations and exact diagonalization studies. It is shown that the dominant mechanism responsible for the charge order is the Jahn-Teller coupling, with a lesser but significant contribution from the on-site Coulomb interaction. The band structure shows a sizable interchain coupling between the zigzag chains, leading to a considerable band dispersion normal to the chains, in sharp contrast with the zigzag chain physics.
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Affiliation(s)
- Z Popović
- Department of Physics & Astronomy, University of Missouri, Columbia, Missouri 65211, USA
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39
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Burley JC, Battle PD, Gallon DJ, Sloan J, Grey CP, Rosseinsky MJ. Magnetism and structural chemistry of the n = 1 Ruddlesden-Popper phases La4LiMnO8 and La3SrLiMnO8. J Am Chem Soc 2002; 124:620-8. [PMID: 11804493 DOI: 10.1021/ja012023z] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Polycrystalline samples of La4LiMnO8 and La3SrLiMnO8 have been studied by a combination of X-ray diffraction (XRD), neutron diffraction (ND), 6Li MAS NMR, electron microscopy (EM), and magnetometry. Room-temperature XRD and ND measurements suggest that both compounds have the K2NiF4 structure, with a disordered arrangement of Li and Mn over the six-coordinate sites. However, MAS NMR and EM demonstrate the presence of local 1:1 Li:Mn order on these sites, and EM shows that although cation order is well-developed in each xy sheet of corner-sharing octahedra, the sheets are stacked randomly along z. The structures are best described as paracrystalline, and many of the concepts of conventional crystallography are inapplicable. Magnetometry and low-temperature ND experiments show that, despite their paracrystallinity, the two compounds are ordered antiferromagnetically with susceptibility maxima at 26 and 18 K, respectively, and with ordered magnetic moments of 3.61(6) and 2.3(1) muB per Mn cation at 2 K. Anisotropic peak broadening reveals a 2D character in the magnetic behavior of both compounds, and La3SrLiMnO8 is well-modeled as a quadratic layer S = 3/2 Heisenberg antiferromagnet.
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Affiliation(s)
- Jonathan C Burley
- Inorganic Chemistry Laboratory, Oxford University, South Parks Road, Oxford, OX1 3QR, UK
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40
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Mitchell JF, Argyriou DN, Berger A, Gray KE, Osborn R, Welp U. Spin, Charge, and Lattice States in Layered Magnetoresistive Oxides. J Phys Chem B 2001. [DOI: 10.1021/jp011419u] [Citation(s) in RCA: 87] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- J. F. Mitchell
- Materials Science Division, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, Illinois 60439
| | - D. N. Argyriou
- Materials Science Division, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, Illinois 60439
| | - A. Berger
- Materials Science Division, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, Illinois 60439
| | - K. E. Gray
- Materials Science Division, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, Illinois 60439
| | - R. Osborn
- Materials Science Division, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, Illinois 60439
| | - U. Welp
- Materials Science Division, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, Illinois 60439
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41
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Larochelle S, Mehta A, Kaneko N, Mang PK, Panchula AF, Zhou L, Arthur J, Greven M. Nature of e(g) electron order in La(1-x)Sr(1+x)MnO(4). PHYSICAL REVIEW LETTERS 2001; 87:095502. [PMID: 11531573 DOI: 10.1103/physrevlett.87.095502] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2000] [Indexed: 05/23/2023]
Abstract
X-ray scattering measurements of the low-temperature structure of La(1-x)Sr(1+x)MnO(4) ( 0.33< or =x< or =0.67) indicate the existence of three distinct regions: a disordered phase (x<0.4), a charge-ordered phase (x> or =0.5), and a mixed phase (0.4< or =x<0.5). For x>0.5, the modulation vector associated with the charge order is incommensurate with the lattice and depends linearly on the concentration of e(g) electrons. The primary superlattice reflections are strongly suppressed along the modulation direction and the higher harmonics are weak, implying the existence of a largely transverse and nearly sinusoidal structural distortion, consistent with a charge-density wave of the e(g) electrons.
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Affiliation(s)
- S Larochelle
- Department of Physics, Stanford University, Stanford, California 94305, USA
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42
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Battle PD, Bell AM, Blundell SJ, Coldea AI, Cussen EJ, Hardy GC, Marshall IM, Rosseinsky MJ, Steer CA. Chemically induced magnetism and magnetoresistance in La(0.8)Sr(1.2)Mn(0.6)Rh(0.4)O(4). J Am Chem Soc 2001; 123:7610-5. [PMID: 11480982 DOI: 10.1021/ja010958+] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
It is shown by magnetometry and microSR spectroscopy that short-range magnetic interactions between the Mn cations in the nonmetallic K(2)NiF(4)-like phase La(0.8)Sr(1.2)Mn(0.6)Rh(0.4)O(4) become significant below approximately 200 K. Negative magnetoresistance (rho/rho(0) approximately 0.5 in 14 T at 108 K) is apparent below this temperature. Neutron diffraction has shown that an applied magnetic field of 5 T is sufficient to induce saturated (3.38(7)mu(B) per Mn) long-range ferromagnetic ordering of the atomic moments at 2 K, and that the induced ordering persists up to a temperature of 50 K in 5 T. Spin glass behavior is observed below 20 K in the absence of an applied field. The induced magnetic ordering is attributed to the subtle changes in band structure brought about by the external field, and to the controlling influence of Rh(3+) over the relative strength of competing magnetic exchange interactions.
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Affiliation(s)
- P D Battle
- Inorganic Chemistry Laboratory, Chemistry Department, University of Oxford, South Parks Road, Oxford OX1 3QR, UK
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43
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Hotta T, Feiguin A, Dagotto E. Stripes induced by orbital ordering in layered manganites. PHYSICAL REVIEW LETTERS 2001; 86:4922-4925. [PMID: 11384382 DOI: 10.1103/physrevlett.86.4922] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2000] [Indexed: 05/23/2023]
Abstract
Spin-charge-orbital ordered structures in doped layered manganites are investigated using an orbital-degenerate double-exchange model tightly coupled to Jahn-Teller distortions. In the ferromagnetic phase, unexpected diagonal stripes at x = 1/m ( m = integer) are observed, as in recent experiments. These stripes are induced by the orbital degree of freedom, which forms a staggered pattern in the background. A pi shift in the orbital order across stripes is identified, analogous to the pi shift in spin order across stripes in cuprates. At x = 1/4 and 1/3, another nonmagnetic phase with diagonal static charge stripes is stabilized at intermediate values of the t(2g)-spins exchange coupling.
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Affiliation(s)
- T Hotta
- Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwa-no-ha, Kashiwa, Chiba 277-8581, Japan
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44
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Synthesis and Characterization of the Electron-Doped Single-Layer Manganite La1.2Sr0.8MnO4−δ and Its Oxidized Phase La1.2Sr0.8MnO4+δ. J SOLID STATE CHEM 2000. [DOI: 10.1006/jssc.2000.8735] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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45
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Effects of Cationic Substitution on the Electronic and Magnetic Properties of Manganocuprate with a Layered Eu3Ba2Mn2Cu2O12Structure. J SOLID STATE CHEM 1998. [DOI: 10.1006/jssc.1998.8017] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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46
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47
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Structural and Morphological Changes Associated with Charge Ordering in La0.2Ca0.8MnO3. J SOLID STATE CHEM 1998. [DOI: 10.1006/jssc.1998.7895] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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48
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49
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Battle PD, Green MA, Laskey NS, Millburn JE, Radaelli PG, Rosseinsky MJ, Sullivan SP, Vente JF. Crystal and magnetic structures of the colossal magnetoresistance manganates Sr2-xNd1+xMn2O7 (x=0.0, 0.1). PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:15967-15977. [PMID: 9985666 DOI: 10.1103/physrevb.54.15967] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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50
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Matsubara I, Funahashi R, Kida N, Ueno K. Stability of Ln3Ba2Mn2Cu2O12(Ln = lanthanide) Compounds and Their Magnetic Properties. CHEM LETT 1996. [DOI: 10.1246/cl.1996.971] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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