Gapless Fermi surfaces of anisotropic multiband superconductors in a magnetic field.
Gapless Fermi surfaces of anisotropic multiband superconductors in a magnetic field.
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DOI：
10.1103/physrevlett.98.087004
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发表时间：
2006-10
影响因子：
8.6
通讯作者：
V. Barzykin;L. Gor’kov
中科院分区：
文献类型：
--
作者：
V. Barzykin;L. Gor’kov
我们提出在平行于平面的磁场作用下，准二维多带超导体中出现一种具有完全无间隙费米面的新态。它的特征是由开放费米表面上的有限态密度引起的顺磁矩。我们计算了s波和d波两种情况下无间隙态的热力学和磁性，并讨论了s波超导体中伴随新相出现的一阶超磁相变的细节。我们提出了在s波（2-H NbSe2）和d波（CeCoIn5）超导体中检测这种状态的可能实验。
We propose that a new state with a fully gapless Fermi surface appears in quasi-2D multiband superconductors in magnetic field applied parallel to the plane. It is characterized by a paramagnetic moment caused by a finite density of states on the open Fermi surface. We calculate thermodynamic and magnetic properties of the gapless state for both s-wave and d-wave cases, and discuss the details of the first order metamagnetic phase transition that accompanies the appearance of the new phase in s-wave superconductors. We suggest possible experiments to detect this state both in the s-wave (2-H NbSe2) and d-wave (CeCoIn5) superconductors.