Anisotropic diamagnetic response in type-II superconductors with gap and Fermi-surface anisotropies.
Phys Rev Lett
; 94(6): 067007, 2005 Feb 18.
Article
en En
| MEDLINE
| ID: mdl-15783772
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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MEDLINE
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En
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Phys Rev Lett
Año:
2005
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Article