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首页> 外文期刊>Physical review >Signatures of thermally excited vortices in a superconductor with competing orders
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Signatures of thermally excited vortices in a superconductor with competing orders

机译：具有竞争顺序的超导体中热激发涡旋的签名

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摘要

Experimental evidence for the existence of a fluctuating charge-density wave order in the pseudogap regime of YBa_2Cu_3O_(6+x) has renewed interest in its interplay with superconductivity. Here, we consider the problem within a nonlinear sigma model, which was recently proposed to describe the apparent competition between the two order parameters. In particular, we use a saddle-point approximation to calculate the properties of superconducting vortex excitations within such a model. In addition, we analytically calculate a collection of experimentally observable quantities, which probe both the superconducting and charge-density wave fluctuations, and identify expected signatures of thermally excited vortices. Specifically, we find that the magnetization and Nernst signal decay rapidly with temperature for a range of temperatures above the Kosterlitz-Thouless transition, while the x-ray structure factor increases in the same temperature range. At higher temperatures, the system enters a regime of Gaussian fluctuations where vortices are no longer well defined, and as a result the magnetization, Nernst signal, and x-ray structure factor all decrease moderately with temperature.
机译：在YBa_2Cu_3O_（6 + x）的伪隙态中，存在一个波动的电荷密度波阶的实验证据，重新引起了人们对它与超导相互作用的兴趣。在这里，我们考虑了非线性sigma模型中的问题，该模型最近被提出来描述两个阶参数之间的表观竞争。特别是，我们使用鞍点近似来计算此类模型中超导涡旋激发的特性。此外，我们通过分析计算出实验可观察到的量的集合，这些量可探测超导和电荷密度波的波动，并确定热激发涡流的预期特征。具体来说，我们发现在高于Kosterlitz-Thouless转变的温度范围内，磁化强度和能斯特信号随温度快速衰减，而在相同温度范围内X射线结构因子增加。在更高的温度下，系统进入高斯起伏状态，在该起伏中不再明确定义涡旋，结果，磁化，能斯特信号和X射线结构因子均随温度适度降低。

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