Effects of vorticity and impurity on NMR relaxation rate in chiral p-wave superconductors

Kenta K. Tanaka; Masanori Ichioka; Seiichiro Onari

doi:10.1016/j.physc.2016.03.003

Effects of vorticity and impurity on NMR relaxation rate in chiral p-wave superconductors

Kenta K. Tanaka, Masanori Ichioka, Seiichiro Onari

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

Abstract

In order to study site-selective NMR in chiral p-wave superconductors, we calculate local nuclear relaxation rate T1-1 in the vortex lattice state by Eilenberger theory with and without non-magnetic impurity scattering in the Born limit and unitary limit. The local T1-1 in the NMR resonance line shape is different between two chiral states p _±, depending on whether the chirality is parallel or anti-parallel to the vorticity. In the p--wave, anomalous suppression of local T1-1 occurs around the vortex core due to the negative coherence term coming from odd-frequency s-wave Cooper pair induced around the vortex. We especially examine the site dependence of the anomalous suppression of local T1-1, including the applied magnetic field dependence and the impurity effects.

Original language	English
Journal	Physica C: Superconductivity and its Applications
DOIs	https://doi.org/10.1016/j.physc.2016.03.003
Publication status	Accepted/In press - Jan 30 2016

Keywords

Chiral p-wave superconductor
Quasiclassical theory
Vortex

ASJC Scopus subject areas

Condensed Matter Physics
Electrical and Electronic Engineering
Energy Engineering and Power Technology
Electronic, Optical and Magnetic Materials

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abstract = "In order to study site-selective NMR in chiral p-wave superconductors, we calculate local nuclear relaxation rate T1-1 in the vortex lattice state by Eilenberger theory with and without non-magnetic impurity scattering in the Born limit and unitary limit. The local T1-1 in the NMR resonance line shape is different between two chiral states p ±, depending on whether the chirality is parallel or anti-parallel to the vorticity. In the p--wave, anomalous suppression of local T1-1 occurs around the vortex core due to the negative coherence term coming from odd-frequency s-wave Cooper pair induced around the vortex. We especially examine the site dependence of the anomalous suppression of local T1-1, including the applied magnetic field dependence and the impurity effects.",

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AU - Tanaka, Kenta K.

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