Anisotropic diamagnetic response in type-II superconductors with gap and fermi-surface anisotropies

H. Adachi; P. Miranović; M. Ichioka; K. Machida

doi:10.1103/PhysRevLett.94.067007

Anisotropic diamagnetic response in type-II superconductors with gap and fermi-surface anisotropies

H. Adachi, P. Miranović, M. Ichioka, K. Machida

Research Institute for Interdisciplinary Science

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

Abstract

The effects of anisotropic gap structures on a diamagnetic response are investigated in order to demonstrate that the field-angle-resolved magnetization [M_L(χ)] 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(χ) 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.

Original language	English
Article number	067007
Pages (from-to)	1-4
Number of pages	4
Journal	Physical Review Letters
Volume	94
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevLett.94.067007
Publication status	Published - Feb 18 2005

ASJC Scopus subject areas

Physics and Astronomy(all)

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abstract = "The 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 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 Hc1 and Hc2. As a prototype of unconventional superconductors, magnetization data for borocarbides are also discussed.",

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AU - Adachi, H.

AU - Miranović, P.

AU - Ichioka, M.

AU - Machida, K.

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N2 - The 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 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 Hc1 and Hc2. As a prototype of unconventional superconductors, magnetization data for borocarbides are also discussed.

AB - The 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 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 Hc1 and Hc2. As a prototype of unconventional superconductors, magnetization data for borocarbides are also discussed.

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