Emergent phenomena in perovskite-type manganites |
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| Authors: | Y. Taguchi H. Sakai D. Okuyama S. Ishiwata J. Fujioka T. Fukuda D. Hashizume F. Kagawa Y. Takahashi R. Shimano Y. Tokunaga Y. Kaneko A. Nakao H. Nakao Y. Murakami K. Sugimoto M. Takata K. Yamauchi S. Picozzi A.Q.R. Baron T. Arima Y. Tokura |
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| Affiliation: | 1. Cross-Correlated Materials Research Group (CMRG) and Correlated Electron Research Group (CERG), RIKEN Advanced Science Institute, Wako 351-0198, Japan;2. Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan;3. Multiferroics Project, ERATO, JST, c/o University of Tokyo, Tokyo 113-8656, Japan;4. Synchrotron Radiation Research Unit, SPring-8/JAEA, Hyogo 679-5148, Japan;5. Materials Dynamics Laboratory, RIKEN SPring-8 Center, Hyogo 679-5148, Japan;6. Advanced Technology Support Division, RIKEN, Wako 351-0198, Japan;g Department of Physics, University of Tokyo, 113-8656, Japan;h Condensed Matter Research Center and Photon Factory, Institute of Materials Structure Science, KEK, Tuskuba 305-0801, Japan;i JASRI SPring-8, Hyogo 679-5198, Japan;j RIKEN SPring-8 Center, Hyogo 679-5148, Japan;k Consiglio Nazionale del le Ricerche-Superconducting and Innovative Materials and Devices (CNR-SPIN), I-67100 L''Aquila, Italy;l Research and Utilization Division, SPring-8/JASRI, Hyogo 679-5198, Japan;m Department of Advanced Materials Science, University of Tokyo, Kashiwa 277-8561, Japan |
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| Abstract: | Perovskite-type manganites exhibit various interesting phenomena arising from complex interplay among spin, charge, orbital, and lattice degrees of freedom. One such example is the keen competition between phases with different spin/charge/orbital orders. Keen competition between antiferromagnetic metal and orbital-ordered insulator is found in the slightly electron-doped regime near Mn4+ state which is stabilized by the high oxygen-pressure condition. Another one is the emergence of ferroelectricity either induced by the magnetic ordering or independently of the magnetic ordering. As the respective examples, perovskite-type YMnO3 and Sr1−xBaxMnO3 are discussed. In the YMnO3, the ferroelectric lattice distortion associated with the E-type spin order is observed for the first time. Displacement-type ferroelectricity with off-center magnetic ions is discovered for Sr0.5Ba0.5MnO3, which shows both large polarization value and strong coupling between ferroelectricity and magnetism. |
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| Keywords: | Phase competition Magnetic ferroelectrics High pressure synthesis |
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