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O'Neal KR, Al-Wahish A, Li ZQ, Dhalenne G, Revcolevschi A, Chen XT, Musfeldt JL. Charge and Bonding in CuGeO 3 Nanorods. NANO LETTERS 2018; 18:3428-3434. [PMID: 29727571 DOI: 10.1021/acs.nanolett.8b00407] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We combine infrared and Raman spectroscopies to investigate finite length scale effects in CuGeO3 nanorods. The infrared-active phonons display remarkably strong size dependence whereas the Raman-active features are, by comparison, nearly rigid. A splitting analysis of the Davydov pairs reveals complex changes in chemical bonding with rod length and temperature. Near the spin-Peierls transition, stronger intralayer bonding in the smallest rods indicates a more rigid lattice which helps to suppress the spin-Peierls transition. Taken together, these findings advance the understanding of size effects and collective phase transitions in low-dimensional oxides.
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Affiliation(s)
- Kenneth R O'Neal
- Department of Chemistry , University of Tennessee , Knoxville , Tennessee 37996 , United States
| | - Amal Al-Wahish
- Department of Chemistry , University of Tennessee , Knoxville , Tennessee 37996 , United States
| | - Zhao-Qian Li
- Institute of Applied Technology, Hefei Institutes of Physical Science , Chinese Academy of Sciences , Hefei , Anhui 230031 , People's Republic of China
| | - Guy Dhalenne
- SP2M-ICMMO UMR-CNRS 8182, Université Paris Saclay , 91405 Orsay Cedex , France
| | | | - Xue-Tai Chen
- State Key Laboratory of Coordination Chemistry, Nanjing National Laboratory of Microstructures, School of Chemistry and Chemical Engineering , Nanjing University , Nanjing 210023 , People's Republic of China
| | - Janice L Musfeldt
- Department of Chemistry , University of Tennessee , Knoxville , Tennessee 37996 , United States
- Department of Physics and Astronomy , University of Tennessee , Knoxville , Tennessee 37996 , United States
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Asaka T, Abe N, Kudo T, Fukuda K, Kimoto K, Matsui Y, Ishizawa N, Arima T. Structural phase transition and magnetic-field effect on the modulated structure in GdBaCo2O5+δ (δ < 0.5). PHYSICAL REVIEW LETTERS 2013; 110:125502. [PMID: 25166819 DOI: 10.1103/physrevlett.110.125502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2012] [Revised: 12/18/2012] [Indexed: 06/03/2023]
Abstract
We investigated the crystal structures of an ordered perovskite-type cobaltate, GdBaCo2O(5+δ) (δ < 0.5), at elevated temperatures by transmission electron microscopy. Above the magnetic ordering temperature, we observed a first-order structural phase transition between the low-temperature tetragonal 3a(p) × 3a(p) and high-temperature orthorhombic 1a(p) × 2a(p) superstructure phases (where a(p) is the perovskite-unit cell). Upon the application of a magnetic field, an incommensurate phase emerges around the structural phase-transition temperature, which indicates a magnetic-field-induced structural phase transition via no magnetic ordering in the ordered perovskite-type cobaltate.
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Affiliation(s)
- T Asaka
- Department of Materials Science and Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan
| | - N Abe
- Department of Advanced Materials Science, University of Tokyo, Kashiwa 277-8561, Japan
| | - T Kudo
- Department of Materials Science and Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan
| | - K Fukuda
- Department of Materials Science and Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan
| | - K Kimoto
- National Institute for Materials Science, Tsukuba 305-0044, Japan
| | - Y Matsui
- National Institute for Materials Science, Tsukuba 305-0044, Japan
| | - N Ishizawa
- Advanced Ceramics Research Center, Nagoya Institute of Technology, Tajimi 507-0071, Japan
| | - T Arima
- Department of Advanced Materials Science, University of Tokyo, Kashiwa 277-8561, Japan
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Abstract
Abstract
An overview is presented of the various oxidic compounds, that exhibit low-dimensional magnetic properties. These include spin-ladder and spin-chain compounds as well as compounds with a low-dimensional electronic band responsible for the magnetic order. The basic structures at room temperature are presented, and their dimensionality is discussed. The structural variations with temperature and magnetic field are analysed. Particular attention is given to the superstructures as they occur upon phase transitions involving the development of magnetic order and charge order. The consequences of these superstructures for the interpretation of the physical properties are reviewed.
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Lorenz T, Ammerahl U, Ziemes R, Büchner B, Revcolevschi A, Dhalenne G. Thermodynamic properties of the incommensurate phase of CuGeO3. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:R15610-R15613. [PMID: 9985714 DOI: 10.1103/physrevb.54.r15610] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Li G, Musfeldt JL, Wang YJ, Jandl S, Poirier M, Revcolevschi A, Dhalenne G. Optical observation of the interplay between magnetic and elastic energy in a spin-Peierls system. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:R15633-R15636. [PMID: 9985720 DOI: 10.1103/physrevb.54.r15633] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Kiryukhin V, Keimer B, Hill JP, Coad SM, Paul DM. Synchrotron x-ray-scattering study of magnetic-field-induced transitions in Cu1-x(Zn, Ni)xGeO3. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:7269-7278. [PMID: 9984348 DOI: 10.1103/physrevb.54.7269] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Fagot-Revurat Y, Horvatic M, Berthier C, Ségransan P, Dhalenne G, Revcolevschi A. NMR Evidence for a Magnetic Soliton Lattice in the High-Field Phase of CuGeO. PHYSICAL REVIEW LETTERS 1996; 77:1861-1864. [PMID: 10063190 DOI: 10.1103/physrevlett.77.1861] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Goñi AR, Zhou T, Schwarz U, Kremer RK, Syassen K. Pressure-Temperature Phase Diagram of the Spin-Peierls Compound CuGeO3. PHYSICAL REVIEW LETTERS 1996; 77:1079-1082. [PMID: 10062985 DOI: 10.1103/physrevlett.77.1079] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Huant S, Martinez G, Dhalenne G, Revcolevschi A. Dynamics in the dimerized and the high-field incommensurate phase of CuGeO3. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:R3730-R3733. [PMID: 9986358 DOI: 10.1103/physrevb.54.r3730] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Musfeldt JL, Wang YJ, Jandl S, Poirier M, Revcolevschi A, Dhalenne G. Infrared investigation of the broken-symmetry ground state in GeCuO3. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:469-473. [PMID: 9984282 DOI: 10.1103/physrevb.54.469] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Palme W, Ambert G, Boucher JP, Dhalenne G, Revcolevschi A. Hysteresis in the incommensurate phase of the spin-Peierls compound CuGeO3: Electron spin resonance in high field. PHYSICAL REVIEW LETTERS 1996; 76:4817-4820. [PMID: 10061388 DOI: 10.1103/physrevlett.76.4817] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Kiryukhin V, Keimer B, Hill JP, Vigliante A. Soliton lattice in pure and diluted CuGeO3. PHYSICAL REVIEW LETTERS 1996; 76:4608-4611. [PMID: 10061334 DOI: 10.1103/physrevlett.76.4608] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Schoeffel JP, Pouget JP, Dhalenne G, Revcolevschi A. Spin-Peierls lattice fluctuations of pure and Si- and Zn-substituted CuGeO3. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:14971-14979. [PMID: 9983291 DOI: 10.1103/physrevb.53.14971] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Plumer ML. Phenomenological model of elastic distortions near the spin-Peierls transition in CuGeO3. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:594-599. [PMID: 9983009 DOI: 10.1103/physrevb.53.594] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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