Field dependence of the zero-energy density of states around vortices in an anisotropic-gap superconductor

N. Nakai; P. Miranović; M. Ichioka; K. Machida

doi:10.1103/PhysRevB.70.100503

Field dependence of the zero-energy density of states around vortices in an anisotropic-gap superconductor

N. Nakai, P. Miranović, M. Ichioka, K. Machida

Research Institute for Interdisciplinary Science

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

76 Citations (Scopus)

Abstract

It is shown theoretically that the Sommerfeld coefficient γ(B) in the mixed state contains useful information on the gap topology in a superconductor. We accurately evaluate γ(B) against magnetic induction B by using microscopic quasiclassical theory. The linear portion in γ(B) relative to 5_c2 and its slope in low field faithfully corresponds to the gap anisotropy, so that we can distinguish the nodal gap and the anisotropic full gap, and estimate the magnitude of the gap anisotropy.

Original language	English
Article number	100503
Pages (from-to)	100503-1-100503-4
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	70
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevB.70.100503
Publication status	Published - Sept 2004

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.70.100503

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title = "Field dependence of the zero-energy density of states around vortices in an anisotropic-gap superconductor",

abstract = "It is shown theoretically that the Sommerfeld coefficient γ(B) in the mixed state contains useful information on the gap topology in a superconductor. We accurately evaluate γ(B) against magnetic induction B by using microscopic quasiclassical theory. The linear portion in γ(B) relative to 5c2 and its slope in low field faithfully corresponds to the gap anisotropy, so that we can distinguish the nodal gap and the anisotropic full gap, and estimate the magnitude of the gap anisotropy.",

author = "N. Nakai and P. Miranovi{\'c} and M. Ichioka and K. Machida",

note = "Funding Information: We are grateful to Y. Matsuda, T. Sakakibara, K. Izawa, T. Hanaguri, T. Kiss, and J. E. Sonier for useful discussions. This work is supported by a Grant-in-Aid for the 21st Century COE “Center for Diversity and University in Physics” from the Ministry of Education, Culture, Sports, Science and Technology of Japan.",

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AU - Nakai, N.

AU - Miranović, P.

AU - Ichioka, M.

AU - Machida, K.

N1 - Funding Information: We are grateful to Y. Matsuda, T. Sakakibara, K. Izawa, T. Hanaguri, T. Kiss, and J. E. Sonier for useful discussions. This work is supported by a Grant-in-Aid for the 21st Century COE “Center for Diversity and University in Physics” from the Ministry of Education, Culture, Sports, Science and Technology of Japan.

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AB - It is shown theoretically that the Sommerfeld coefficient γ(B) in the mixed state contains useful information on the gap topology in a superconductor. We accurately evaluate γ(B) against magnetic induction B by using microscopic quasiclassical theory. The linear portion in γ(B) relative to 5c2 and its slope in low field faithfully corresponds to the gap anisotropy, so that we can distinguish the nodal gap and the anisotropic full gap, and estimate the magnitude of the gap anisotropy.

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Field dependence of the zero-energy density of states around vortices in an anisotropic-gap superconductor

Abstract

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