Melting of Pb Charge Glass and Simultaneous Pb鈥揅r Charge Transfer in PbCrO3 as the Origin of Volume Collapse

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• 作者：Runze Yu ; Hajime Hojo ; Tetsu Watanuki ; Masaichiro Mizumaki ; Takashi Mizokawa ; Kengo Oka ; Hyunjeong Kim ; Akihiko Machida ; Kouji Sakaki ; Yumiko Nakamura ; Akane Agui ; Daisuke Mori ; Yoshiyuki Inaguma ; Martin Schlipf ; Konstantin Z. Rushchanskii ; Marjana Le啪ai膰 ; Masaaki Matsuda ; Jie Ma ; Stuart Calder ; Masahiko Isobe ; Yuichi Ikuhara ; Masaki Azuma
• 刊名：Journal of the American Chemical Society
• 出版年：2015
• 出版时间：October 7, 2015
• 年：2015
• 卷：137
• 期：39
• 页码：12719-12728
• 全文大小：646K
• ISSN：1520-5126

文摘

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 Pb²⁺_0.5Pb⁴⁺_0.5Cr³⁺O₃ with Pb²⁺鈥揚b⁴⁺ correlation length of three lattice-spacings at ambient condition. A pressure induced melting of charge glass and simultaneous Pb鈥揅r charge transfer causes an insulator to metal transition and 鈭?0% volume collapse.