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arXiv 0810.2772cond-mat.supr-concond-mat.str-el
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二维d波超导体中specific heat振荡随面内磁场角的反演

Inversion of specific heat oscillations with in-plane magnetic field angle in 2D d-wave superconductors

G. R. Boyd, P. J. Hirschfeld, I. Vekhter, A. B. Vorontsov

摘要:

对几种新型超导化合物的实验已经观察到当外加磁场相对于晶轴旋转时比热的振荡。结果通常被解释为产生于一个非常规的序参量的节点,但节点方向的识别有时是有争议的。在这里,我们表明与半经典模型计算,当磁场点的节点的方向,无论是最小值或最大值可以发生在比热取决于温度$T$和磁场$H$。反转的角振荡发生相对于那些预测较早在低温下的节点近似。这一结果,连同的论点,反转发生的基础上有效的近似在中等领域,表明比热振荡的反转是一个内在的功能节点超导体。

英文摘要:

Experiments on several novel superconducting compounds have observed oscillations of the specific heat when an applied magnetic field is rotated with respect to the crystal axes. The results are commonly interpreted as arising from the nodes of an unconventional order parameter, but the identifications of nodal directions are sometimes controversial. Here we show with a semiclassical model calculation that when the magnetic field points in the direction of the nodes, either minima or maxima can occur in the specific heat depending on the the temperature $T$ and the magnetic field $H$. An inversion of the angular oscillations takes place with respect to those predicted earlier at low temperature by the nodal approximation. This result, together with the argument that the inversion takes place based on an approximation valid at moderate fields, indicates that the inversion of specific heat oscillations is an intrinsic feature of nodal superconductors.

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