Vortex State and Field-Angle Resolved Specific Heat Oscillation for H ∥ab in d-Wave Superconductors
Vortex State and Field-Angle Resolved Specific Heat Oscillation for H ∥ab in d-Wave Superconductors
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DOI：
10.1143/jpsj.79.094709
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发表时间：
2010-04
影响因子：
1.7
通讯作者：
M. Hiragi;Kenta Suzuki;M. Ichioka;K. Machida
中科院分区：
文献类型：
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作者：
M. Hiragi;Kenta Suzuki;M. Ichioka;K. Machida
采用自洽Eilenberger理论，定量研究了磁场平行于a B面作用于dx 2 -y2波超导体时，稳定涡旋晶格结构的转变、局域态密度的空间结构以及磁场取向旋转引起的比热振荡.我们估计了涡旋态的变化取决于超导带隙的节点方向和磁场方向之间的相对角度。为了再现CeCoIn 5中观察到的比热振荡的符号变化，我们的研究通过包括强顺磁效应来进行。定量的理论计算给出了决定性的信息，分析实验数据的场角依赖性，并建立角分辨比热实验作为光谱手段，以确定节点位置的超导间隙。
When magnetic field is applied parallel to the a b -plane in d x 2 - y 2 -wave superconductors, the transition of a stable vortex lattice structure, the spatial structure of local density of states, and the specific heat oscillation induced by rotation of the magnetic field orientation are investigated by quantitative calculations based on the self-consistent Eilenberger theory. We estimate how the vortex state changes depending on the relative angle between the node direction of the superconducting gap and magnetic field orientation. To reproduce the sign change of specific heat oscillation observed in CeCoIn 5 , our study is perfomed by including a strong paramagnetic effect. The quantitative theoretical calculations give decisive information to analyze the experimental data on the field-angle dependence, and establish the angle-resolved specific heat experiment as a spectroscopic means to identify the node position of the superconducting gap.