Evidence of superconductivity on the border of quasi-2D ferromagnetism in Ca2RuO4 at high pressure
Evidence of superconductivity on the border of quasi-2D ferromagnetism in Ca2RuO4 at high pressure
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DOI：
10.1088/0953-8984/22/5/052202
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发表时间：
2010-02-10
影响因子：
2.7
通讯作者：
Lonzarich, Gilbert George
中科院分区：
文献类型：
--
作者：
Alireza, Patricia Lebre;Nakamura, Fumihiko;Lonzarich, Gilbert George
层状钙钛矿Ca2RuO4在环境压力下是自旋1的Mott绝缘体，并且表现出金属铁磁性，其最大居里温度为28 K，至少高达80 kbar。高于类似于90和高达140千巴，达到的最高压力，电阻率和交流磁化率显示出明显的下降低于类似于0.4 K，在施加的磁场高达类似于10 mT。这表明我们的样品Ca_2RuO_4在准二维铁磁态的边界上是弱超导的。
The layered perovskite Ca2RuO4 is a spin-one Mott insulator at ambient pressure and exhibits metallic ferromagnetism at least up to similar to 80 kbar with a maximum Curie temperature of 28 K. Above similar to 90 and up to 140 kbar, the highest pressure reached, the resistivity and ac susceptibility show pronounced downturns below similar to 0.4 K in applied magnetic fields of up to similar to 10 mT. This indicates that our specimens of Ca2RuO4 are weakly superconducting on the border of a quasi-2D ferromagnetic state.