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

作者：Yu Runze^*; Hojo Hajime; Watanuki Tetsu; Mizumaki Masaichiro; Mizokawa Takashi; Oka Kengo; Kim Hyunjeong; Machida Akihiko; Sakaki Kouji; Nakamura Yumiko; Agui Akane; Mori Daisuke; Inaguma Yoshiyuki; Schlipf Martin; Rushchanskii Konstantin Z; Lezaic Marjana; Matsuda Masaaki; Ma Jie; Calder Stuart; Isobe Masahiko; Ikuhara Yuichi; Azuma Masaki

来源：Journal of the American Chemical Society, 2015, 137(39): 12719-12728.

DOI：10.1021/jacs.5b08216

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 Pb0.52+Pb0.54+Cr3+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 similar to 10% volume collapse.

• 出版日期2015-10-7