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Anisotropic Diamagnetic Response in Type-II Superconductors with Gap and Fermi-Surface Anisotropies

H. Adachi·P. Miranović·M. Ichioka·K. Machida
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Abstract

Effects of anisotropic gap structures on a diamagnetic response are investigated in order to demonstrate that the field-angle-resolved magnetization ($M_L(χ)$) measurement can be used as a spectroscopic method to detect gap structures. Our microscopic calculation based on the quasiclassical Eilenberger formalism reveals that $M_L(χ)$ in a superconductor with four-fold gap displays a four-fold oscillation reflecting the gap and Fermi surface anisotropies, and the sign of this oscillation changes at a field between $H_{c1}$ and $H_{c2}$. As a prototype of unconventional superconductors, magnetization data for borocarbides are also discussed.

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H. Adachi, P. Miranović, M. Ichioka, K. Machida. 2005-03-11. Anisotropic Diamagnetic Response in Type-II Superconductors with Gap and Fermi-Surface Anisotropies. https://doi.org/10.1103/physrevlett.94.067007

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