NMR study of superconductors Li2(Pd1-xPt x)3B and Mg10±xIr19B 16+y without inversion symmetry

S. Harada; K. Tahara; Z. Li; J. L. Luo; Y. Inada; Guo Qing Zheng

doi:10.1016/j.physc.2009.12.029

NMR study of superconductors Li₂(Pd_1-xPt _x)₃B and Mg_10±xIr₁₉B _16+y without inversion symmetry

S. Harada, K. Tahara, Z. Li, J. L. Luo, Y. Inada, Guo Qing Zheng

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

Abstract

We report the ¹¹B NMR measurements in non-centrosymmetric superconductors Li₂(Pd_1-xPt_x)₃B (x=0.0,0.2,0.5,1.0),Mg_9.3Ir₁₉B_16.7 and Mg _10.5Ir₁₉B_17.1. In Li₂(Pd _1-xPt_x)₃B, BCS superconducting state for x=0-0.5 evolves into an exotic state with line nodes in the gap function for x=1, which is attributed to the enhanced spin-orbit coupling due to heavy element Pt. In Mg_9.3Ir₁₉B_16.7 and Mg _10.5Ir₁₉B_17.1, Cooper pairs are predominantly in the spin-singlet state with an isotropic gap. However, in Mg _10.5Ir₁₉B_17.1 the spin susceptibility remains finite even in the zero-temperature limit, which is due to the defects that enhance the spin-orbit coupling and bring about more spin-triplet component.

Original language	English
Pages (from-to)	S678-S681
Journal	Physica C: Superconductivity and its applications
Volume	470
Issue number	SUPPL.1
DOIs	https://doi.org/10.1016/j.physc.2009.12.029
Publication status	Published - Dec 1 2010

Keywords

NMR
Noncentrosymmetric superconductor
Nuclear spin-lattice relaxation rate

ASJC Scopus subject areas

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

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title = "NMR study of superconductors Li2(Pd1-xPt x)3B and Mg10±xIr19B 16+y without inversion symmetry",

abstract = "We report the 11B NMR measurements in non-centrosymmetric superconductors Li2(Pd1-xPtx)3B (x=0.0,0.2,0.5,1.0),Mg9.3Ir19B16.7 and Mg 10.5Ir19B17.1. In Li2(Pd 1-xPtx)3B, BCS superconducting state for x=0-0.5 evolves into an exotic state with line nodes in the gap function for x=1, which is attributed to the enhanced spin-orbit coupling due to heavy element Pt. In Mg9.3Ir19B16.7 and Mg 10.5Ir19B17.1, Cooper pairs are predominantly in the spin-singlet state with an isotropic gap. However, in Mg 10.5Ir19B17.1 the spin susceptibility remains finite even in the zero-temperature limit, which is due to the defects that enhance the spin-orbit coupling and bring about more spin-triplet component.",

keywords = "NMR, Noncentrosymmetric superconductor, Nuclear spin-lattice relaxation rate",

author = "S. Harada and K. Tahara and Z. Li and Luo, {J. L.} and Y. Inada and Zheng, {Guo Qing}",

year = "2010",

month = dec,

day = "1",

doi = "10.1016/j.physc.2009.12.029",

language = "English",

volume = "470",

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journal = "Physica C: Superconductivity and its Applications",

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AU - Harada, S.

AU - Tahara, K.

AU - Li, Z.

AU - Luo, J. L.

AU - Inada, Y.

AU - Zheng, Guo Qing

PY - 2010/12/1

Y1 - 2010/12/1

N2 - We report the 11B NMR measurements in non-centrosymmetric superconductors Li2(Pd1-xPtx)3B (x=0.0,0.2,0.5,1.0),Mg9.3Ir19B16.7 and Mg 10.5Ir19B17.1. In Li2(Pd 1-xPtx)3B, BCS superconducting state for x=0-0.5 evolves into an exotic state with line nodes in the gap function for x=1, which is attributed to the enhanced spin-orbit coupling due to heavy element Pt. In Mg9.3Ir19B16.7 and Mg 10.5Ir19B17.1, Cooper pairs are predominantly in the spin-singlet state with an isotropic gap. However, in Mg 10.5Ir19B17.1 the spin susceptibility remains finite even in the zero-temperature limit, which is due to the defects that enhance the spin-orbit coupling and bring about more spin-triplet component.

AB - We report the 11B NMR measurements in non-centrosymmetric superconductors Li2(Pd1-xPtx)3B (x=0.0,0.2,0.5,1.0),Mg9.3Ir19B16.7 and Mg 10.5Ir19B17.1. In Li2(Pd 1-xPtx)3B, BCS superconducting state for x=0-0.5 evolves into an exotic state with line nodes in the gap function for x=1, which is attributed to the enhanced spin-orbit coupling due to heavy element Pt. In Mg9.3Ir19B16.7 and Mg 10.5Ir19B17.1, Cooper pairs are predominantly in the spin-singlet state with an isotropic gap. However, in Mg 10.5Ir19B17.1 the spin susceptibility remains finite even in the zero-temperature limit, which is due to the defects that enhance the spin-orbit coupling and bring about more spin-triplet component.

KW - NMR

KW - Noncentrosymmetric superconductor

KW - Nuclear spin-lattice relaxation rate

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