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 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 Hc1 and Hc2. As a prototype of unconventional superconductors, magnetization data for borocarbides are also discussed.
@article{arxiv.cond-mat/0411290,
title = {Anisotropic Diamagnetic Response in Type-II Superconductors with Gap and Fermi-Surface Anisotropies},
author = {H. Adachi and P. Miranović and M. Ichioka and K. Machida},
journal= {arXiv preprint arXiv:cond-mat/0411290},
year = {2016}
}