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Anisotropic diamagnetic response in type-II superconductors with gap and Fermi-surface anisotropies
H Adachi1, P Miranović, M Ichioka
1Department of Physics, Okayama University, Okayama 700-8530, Japan.
Abstract:
The effects of anisotropic gap structures on a diamagnetic response are investigated in order to demonstrate that the field-angle-resolved magnetization [ML(chi)] measurement can be used as a spectroscopic method to detect gap structures. Our microscopic calculation based on the quasiclassical Eilenberger formalism reveals that ML(chi) in a superconductor with a fourfold gap displays a fourfold oscillation reflecting the gap and Fermi-surface anisotropies, and the sign of this oscillation changes at a field between Hc1 and Hc2. As a prototype of unconventional superconductors, magnetization data for borocarbides are also discussed.
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