Enigma of the vortex state in a strongly correlated d -wave superconductor
Enigma of the vortex state in a strongly correlated d -wave superconductor
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DOI：
10.1103/physrevb.107.l140505
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发表时间：
2022-06
影响因子：
3.7
通讯作者：
A. Datta;Hitesh J. Changlani;Kun Yang;A. Ghosal
中科院分区：
文献类型：
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作者：
A. Datta;Hitesh J. Changlani;Kun Yang;A. Ghosal
我们发现，在强关联d波超导体的欠掺杂情况下，强电子斥力使涡旋核从过度掺杂的金属型转变为Mott绝缘体。这种转变伴随着涡旋核心处电子密度向欠掺杂区域局部半填充方向的积累，这反过来又促进了Mott绝缘核心的形成。我们发现，涡旋的大小随掺杂的变化不是单调的。从超流刚性中提取的临界场Hrmc2也具有类似的非单调性。我们的结果解释了最近关于铜酸盐超导体的一些实验难题。
We show that strong electronic repulsion transforms a vortex core from a metallic-type in overdoped regime to a Mott-insulator at underdoping of a strongly correlated d-wave superconductor. This changeover is accompanied by an accumulation of electron density at the vortex core towards local half-filling in the underdoped region, which in turn facilitates the formation of the Mott insulating core. We find that the size of vortices evolves non-monotonically with doping. A similar non-monotonicity of critical field $H_{\rm c2}$, as extracted from superfluid stiffness, is also found. Our results explain some recent experimental puzzles of cuprate superconductors.