Acta Medica Okayama 94 6 2005 Anisotropic diamagnetic response in type-II superconductors with gap and fermi-surface anisotropies EN H Adachi P Miranovic M Ichioka K Machida <p>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.</p> No potential conflict of interest relevant to this article was reported.