铁磁钙钛矿BaRuO₃的临界行为。

Critical behavior of the ferromagnetic perovskite BaRuO3.

作者信息

Zhou J-S, Matsubayashi K, Uwatoko Y, Jin C-Q, Cheng J-G, Goodenough J B, Liu Q Q, Katsura T, Shatskiy A, Ito E

机构信息

Institute for Solid State Physics, University of Tokyo, Kashiwa, Japan.

出版信息

Phys Rev Lett. 2008 Aug 15;101(7):077206. doi: 10.1103/PhysRevLett.101.077206.

DOI:10.1103/PhysRevLett.101.077206

PMID:18764577

Abstract

A thorough study has been made of the physical properties under high pressure of the perovskite BaRuO3 synthesized under pressure; it includes the critical behavior in the vicinity of Tc to 1 GPa and the temperature dependences of resistivity and ac magnetic susceptibility up to 8 GPa. The ferromagnetism in BaRuO3 is suppressed at 8 GPa. Critical fluctuations in the vicinity of Tc have been found in BaRuO3 and they are enhanced under pressure. These observations are in sharp contrast to SrRuO3 where mean-field behavior is found at Tc.

摘要

对在高压下合成的钙钛矿型BaRuO₃的高压物理性质进行了全面研究；其中包括在高达1 GPa的压力下，Tc附近的临界行为以及高达8 GPa的电阻率和交流磁化率的温度依赖性。BaRuO₃中的铁磁性在8 GPa时受到抑制。在BaRuO₃中发现了Tc附近的临界涨落，并且在压力下这些涨落增强。这些观察结果与SrRuO₃形成鲜明对比，在SrRuO₃中，在Tc处发现了平均场行为。