Anisotropic diamagnetic response in type-II superconductors with gap and fermi-surface anisotropies

Hiroto Adachi, P. Miranović, Masanori Ichioka, K. Machida

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Abstract

The effects of anisotropic gap structures on a diamagnetic response are investigated in order to demonstrate that the field-angle-resolved magnetization [ML(χ)] measurement can be used as a spectroscopic method to detect gap structures. Our microscopic calculation based on the quasiclassical Eilenberger formalism reveals that ML(χ) 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.

Original languageEnglish
Article number067007
JournalPhysical Review Letters
Volume94
Issue number6
DOIs
Publication statusPublished - Feb 18 2005

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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