title: Melting of Pb Charge Glass and Simultaneous Pb-Cr Charge Transfer in PbCrO3 as the Origin of Volume Collapse.
abstract: A metal to insulator transition in integer or half integer charge systems can be regarded as crystallization of charges. The insulating state tends to have a glassy nature when randomness or geometrical frustration exists. We report that the charge glass state is realized in a perovskite compound PbCrO3, which has been known for almost 50 years, without any obvious inhomogeneity or triangular arrangement in the charge system. PbCrO3 has a valence state of Pb(2+)(0.5)Pb(4+)(0.5)Cr(3+)O3 with Pb(2+)-Pb(4+) correlation length of three lattice-spacings at ambient condition. A pressure induced melting of charge glass and simultaneous Pb-Cr charge transfer causes an insulator to metal transition and ∼10% volume collapse.
authors.affiliation: Materials and Structures Laboratory, Tokyo Institute of Technology , 4259 Nagatsuta, Midori, Yokohama, 226-8503, Japan.
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authors.initials: R
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authors.affiliation: Materials and Structures Laboratory, Tokyo Institute of Technology , 4259 Nagatsuta, Midori, Yokohama, 226-8503, Japan.
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authors.affiliation: Quantum Beam Science Center, Japan Atomic Energy Agency , Sayo, Hyogo 679-5148, Japan.
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authors.affiliation: Department of Complexity Science and Engineering, University of Tokyo , Kashiwa, Chiba 277-8561, Japan.
authors.forename: Takashi
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authors.affiliation: Materials and Structures Laboratory, Tokyo Institute of Technology , 4259 Nagatsuta, Midori, Yokohama, 226-8503, Japan.
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authors.affiliation: Quantum Beam Science Center, Japan Atomic Energy Agency , Sayo, Hyogo 679-5148, Japan.
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authors.affiliation: National Institute of Advanced Industrial Science and Technology , Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan.
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authors.affiliation: National Institute of Advanced Industrial Science and Technology , Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan.
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authors.affiliation: Quantum Beam Science Center, Japan Atomic Energy Agency , Sayo, Hyogo 679-5148, Japan.
authors.forename: Akane
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authors.lastname: Agui
authors.affiliation: Department of Chemistry, Faculty of Science, Gakushuin University , 1-5-1 Mejiro, Toshima, Tokyo 171-8588, Japan.
authors.forename: Daisuke
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authors.lastname: Mori
authors.affiliation: Department of Chemistry, Faculty of Science, Gakushuin University , 1-5-1 Mejiro, Toshima, Tokyo 171-8588, Japan.
authors.forename: Yoshiyuki
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authors.lastname: Inaguma
authors.affiliation: Peter Grünberg Institut, Forschungszentrum Jülich and JARA , Jülich 52425, Germany.
authors.forename: Martin
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authors.lastname: Schlipf
authors.affiliation: Peter Grünberg Institut, Forschungszentrum Jülich and JARA , Jülich 52425, Germany.
authors.forename: Konstantin Z
authors.initials: KZ
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authors.affiliation: Peter Grünberg Institut, Forschungszentrum Jülich and JARA , Jülich 52425, Germany.
authors.forename: Marjana
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authors.affiliation: Quantum Condensed Matter Division, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States.
authors.forename: Masaaki
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authors.lastname: Matsuda
authors.affiliation: Quantum Condensed Matter Division, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States.
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authors.affiliation: Quantum Condensed Matter Division, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States.
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authors.lastname: Calder
authors.affiliation: Institute for Solid State Physics, University of Tokyo , Chiba 277-8581, Japan.
authors.forename: Masahiko
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authors.lastname: Isobe
authors.affiliation: Institute of Engineering Innovation, University of Tokyo , Bunkyo, Tokyo 113-8656, Japan.
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Ikuhara
authors.affiliation: Materials and Structures Laboratory, Tokyo Institute of Technology , 4259 Nagatsuta, Midori, Yokohama, 226-8503, Japan.
authors.forename: Masaki
authors.initials: M
authors.lastname: Azuma