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arXiv 2206.07752cond-mat.supr-concond-mat.str-el
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强关联d波超导体中涡旋态的谜题

Enigma of the vortex state in a strongly correlated d-wave superconductor

Anushree Datta, Hitesh J. Changlani, Kun Yang, Amit Ghosal

AI总结:

该研究针对强关联d波超导体的涡旋态问题,揭示强电子排斥使涡旋核随掺杂从金属型转为Mott绝缘型,涡旋尺寸与临界场$H_{\ m c2}$均呈非单调演化,解释了铜氧化物超导体的相关实验谜题。

摘要:

我们发现,在强关联d波超导体中,强电子排斥作用会使涡旋核从过掺杂区的金属型转变为欠掺杂下的Mott绝缘体(莫特绝缘体)。这种转变伴随着欠掺杂区域涡旋核处的电子密度向局域半满积累,这反过来又促进了Mott绝缘涡旋核的形成。我们发现涡旋尺寸随掺杂浓度呈非单调演化。从超流刚度提取的临界场$H_{\ m c2}$也存在类似的非单调性。我们的结果解释了近期铜氧化物超导体的一些实验谜题。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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