Rotation of Triangular Vortex Lattice in the Two-Band Superconductor MgB2

被引：12

作者：

Hirano, Tomoya ^{[1
]}

Takamori, Kenta ^{[1
]}

Ichioka, Masanori ^{[1
]}

Machida, Kazushige ^{[1
]}

机构：

[1] Okayama Univ, Dept Phys, Okayama 7008530, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2013年 / 82卷 / 06期

关键词：

vortex lattice morphology; two-band superconductivity; MgB2; first-principles band calculation; quasi-classical Eilenberger theory; STATE; HEAT;

D O I：

10.7566/JPSJ.82.063708

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

To identify the contributions of the multiband nature and the anisotropy of a microscopic electronic structure to a macroscopic vortex lattice morphology, we develop a method based on the Eilenberger theory near Hc(2) combined with the first-principles band calculation to estimate the stable vortex lattice configuration. For a typical two-band superconductor MgB2, successive transitions of vortex lattice orientation that have been observed recently by small angle neutron scattering [Das et al.: Phys. Rev. Lett. 108 (2012) 167001] are explained by the characteristic fielddependence of two-band superconductivity and the competition of sixfold anisotropy between the sigma-and pi-bands. The reentrant transition at low temperature reflects the Fermi velocity anisotropy of the sigma-band.

引用

页数：4

共 30 条

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