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Title: Melting of Pb Charge Glass and Simultaneous Pb-Cr Charge Transfer in PbCrO3 as the Origin of Volume Collapse

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. In this paper, 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 Pb2+0.5Pb4+0.5Cr3+O3 with Pb2+–Pb4+ 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.
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  1. Tokyo Inst. of Technology (Japan)
  2. Japan Atomic Energy Agency (JAEA), Hyogo (Japan)
  3. Japan Synchrotron Radiation Research Institute, Sayo, Hyogo (Japan)
  4. Univ. of Tokyo (Japan)
  5. National Inst. of Advanced Industrial Science and Technology (AIST), Tsukuba (Japan)
  6. Gakushuin University, Tokyo (Japan)
  7. Forschungszentrum Julich (Germany)
  8. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
OSTI Identifier:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Journal of the American Chemical Society
Additional Journal Information:
Journal Volume: 137; Journal Issue: 39; Journal ID: ISSN 0002-7863
American Chemical Society (ACS)
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)
Sponsoring Org:
Country of Publication:
United States