Ferroelectric-like metallic state in electron doped BaTiO3.
We report that a ferroelectric-like metallic state with reduced anisotropy of polarization is created by the doping of conduction electrons into BaTiO3, on the bases of x-ray/electron diffraction and infrared spectroscopic experiments. The crystal structure is heterogeneous in nanometer-scale, as enabled by the reduced polarization anisotropy. The enhanced infrared intensity of soft phonon along with the resistivity reduction suggests the presence of unusual electron-phonon coupling, which may be responsible for the emergent ferroelectric structure compatible with metallic state.
Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Hongo, Tokyo 113-8656, Japan.
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Fujioka
Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Hongo, Tokyo 113-8656, Japan.
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Doi
RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan.
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Okuyama
RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan.
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Morikawa
RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan.|Department of Advanced Materials Science, University of Tokyo, Kashiwa 227-8561 Japan.
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Arima
Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Hongo, Tokyo 113-8656, Japan.
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Okada
RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan.
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Kaneko
Syncrotron Radiation Research Unit, JAEA/SPring-8, Sayo, Hyogo 679-5148, Japan.|Materials Dynamics Laboratory, RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan.
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Fukuda
Materials Dynamics Laboratory, RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan.|Research and Utilization Division, JASRI/SPring-8, Sayo, Hyogo 679-5198, Japan.
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Uchiyama
Materials Dynamics Laboratory, RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan.|Research and Utilization Division, JASRI/SPring-8, Sayo, Hyogo 679-5198, Japan.
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Ishikawa
Materials Dynamics Laboratory, RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan.|Research and Utilization Division, JASRI/SPring-8, Sayo, Hyogo 679-5198, Japan.
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Baron
Structural Materials Science Laboratory, RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan.
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Kato
Structural Materials Science Laboratory, RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan.
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Takata
Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Hongo, Tokyo 113-8656, Japan.|RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan.
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Tokura