High-Pressure Thermopower of the Mott Insulator Ca2RuO4

被引：0

作者：

Sano, Isuzu ^{[1
]}

Nakano, Tomohito ^{[2
]}

Nakano, Akitoshi ^{[1
]}

Taniguchi, Hiroki ^{[1
]}

Nakamura, Fumihiko ^{[3
]}

Terasaki, Ichiro ^{[1
]}

机构：

[1] Nagoya Univ, Dept Phys, Nagoya, Aichi 4648602, Japan

[2] Niigata Univ, Grad Sch Sci & Technol, Niigata 9502181, Japan

[3] Kurume Inst Technol, Dept Educ & Creat Engn, Kurume, Fukuoka 8300052, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2022年 / 91卷 / 03期

关键词：

THERMOELECTRIC-POWER; LAYERED PEROVSKITE; TRANSITION; CRYSTAL;

D O I：

10.7566/JPSJ.91.033703

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have measured and analyzed the thermopower of single-crystal samples of the Mott insulator Ca2RuO4 in high pressure up to 0.9 GPa. We find that the thermopower rapidly changes at a metal-insulator transition temperature, which is explained in terms of a percolation theory. In contrast, the thermopower in the insulator phase slightly decreases with increasing pressure well below the transition temperature, and is associated with thermodynamic quantities through the Kelvin formula. The pressure dependence is compared with the current-density dependence, and a possible origin for the current-enhanced thermopower is proposed.

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页数：5

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