高温超导系统热电势的普遍特征与量子临界性
Universal features of Thermopower in High Tc systems and Quantum Criticality
摘要：
在高Tc超导体中，已经观察到转变温度Tc和室温热电势Q的掺杂依赖性之间的广泛联系。这两个量之间存在"普遍相关性"，如OCTHH（Obertelli，Cooper，Tallon，Honma和Hor）所指出的，在最佳掺杂时热电势消失。在这项工作中，我们提供了一个解释，这OCTHH的普遍性在一个可能的潜在的量子临界点（QCP）在Tc。我们观点的核心是最近注意到的开尔文公式，它将热电势与熵的密度导数联系起来。透视这个公式是通过模型计算的各种Kubo公式在一个精确求解的一维模型与各种限制程序的波矢量和频率。
英文摘要：
In high Tc superconductors a wide ranging connection between the doping dependence of the transition temperature Tc and the room temperature thermopower Q has been observed. A "universal correlation" between these two quantities exists with the thermopower vanishing at optimum doping as noted by OCTHH (Obertelli, Cooper, Tallon, Honma and Hor). In this work we provide an interpretation of this OCTHH universality in terms of a possible underlying quantum critical point (QCP) at Tc. Central to our viewpoint is the recently noted Kelvin formula relating the thermopower to the density derivative of the entropy. Perspective on this formula is gained through a model calculation of the various Kubo formulas in an exactly solved 1-dimensional model with various limiting procedures of wave vector and frequency.
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