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通过高T超导体的干净CuO2板保护的小费米口袋的观察

So Kunisada¹, Shunsuke Isono², Yoshimitsu Kohama^1,3

¹ISSP, University of Tokyo, Kashiwa, Chiba 277-8581, Japan.

Science (New York, N.Y.)

|August 15, 2020

概括

研究人员在酸盐超导体中观察到难以捉摸的小费米口袋,这对于理解高临界温度 (Tc) 超导度至关重要. 这些发现揭示了氧化铜板中的超导性和反铁磁性的共存.

科学领域:

凝聚物质物理学
材料科学
量子材料

背景情况:

酸超导体具有较高的临界温度 (Tc).
母化合物是抗铁磁Mott绝缘体.
预计兴奋剂会形成小费米口袋, 但这些仍然没有被观察到.

研究的目的:

研究Ba2Ca4Cu5O10(F,O) 2的电子结构.
在cuprates中搜索预测的小费米口袋.
了解超导和反铁磁之间的关系.

主要方法:

角度分辨率光辐射光谱 (ARPES).
进行量子振荡测量.
对五层酸盐的研究具有较低的失调性.

主要成果:

在Brillouin区域中观察到以 (π/2,π/2) 为中心的小费米口袋.
证实了D波超导间隙在这些口袋.
在同一个CuO2板中证明了超导和反铁磁的共存.

结论:

在特定的酸盐系统中实验证实了小费米口袋.
超导性可以在没有反节点区域的贡献的情况下存在.
超导和反铁磁在板层的同时存在.

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