Pressure induced novel-phenomena in Mott insulator Ca₂RuO₄

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• 作者：Yohei Yamauchi ; Fumihiko Nakamura ; Mariko Sakaki ; Tetsuo Takemoto ; Takashi Suzuki ; Patricia L. Alireza ; Yoshiteru Maeno
• 关键词：Ca₂RuO₄ ; Mott transition ; Pressure ; Itinerant ferromagnetism ; Quantum phase transition
• 刊名：Physica C
• 出版年：2010
• 出版时间：December 2010
• 年：2010
• 卷：470
• 期：Supplement 1
• 页码：S740-S741
• 全文大小：254 K

文摘

In order to explore unconventional superconductivity, we have studied pressure effect on a 4d-electron Mott insulator Ca₂RuO₄. Pressurisation to Ca₂RuO₄ above 0.5 GPa transforms it from a Mott insulator to a metal with a ferromagnetic ground state. The itinerancy of the ferromagnetic state at 2 GPa is quantitatively evidenced by the magnetisation process at 2 K. Moreover, the pressure phase diagram of this system suggests the existence of a ferromagnetic quantum phase transition at 10 GPa.