Anisotropy of in-plane magnetization due to nodal gap structure in the vortex state

Details Anisotropy of in-plane magnetization due to nodal gap structure in the vortex state Anisotropy of in-plane magnetization due to nodal gap structure in the vortex state

2004-11-21

arxiv.org/abs/cond-mat/0411540v1

J. Phys. Soc. Jpn. 74 (2005) 1119

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1143/JPSJ.74.1119

We examine the interplay between anisotropy of the in-plane magnetization and the nodal gap structure on the basis of the approximate analytic solution in the quasiclassical formalism. We show that a four-fold oscillation appears in the magnetization, and its amplitude changes sign at an intermediate field. The high-field oscillation originates from the anisotropy of the upper critical field, while the low-field behavior can be understood by the thermally activated quasiparticles near nodes depending on the applied field angles. The temperature dependence of the magnetization also shows a similar sign change. The anisotropy of the magnetization offers a possible measurement to identify the gap structure directly for a wide class of type II superconductors.

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