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Adachi, H Okayama University
Miranovic, P University of Montenegro
Ichioka, M Okayama University
Machida, K Okayama University
The effects of anisotropic gap structures on a diamagnetic response are investigated in order to demonstrate that the field-angle-resolved magnetization [M-L (chi)] 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 (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 H-c1 and H-c2. As a prototype of unconventional superconductors, magnetization data for borocarbides are also discussed.
Digital Object Identifer:10.1103/PhysRevLett.94.067007
Published with permission from the copyright holder. This is the institute's copy, as published in Physical Review Letters, February 2005, Volume 94, Issue 6, Pages 4.
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Physical Review Letters
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