Nuclear spin-lattice relaxation in non-centrosymmetric superconductors Li2(Pd,Pt)3B

M. Kandatsu; M. Nishiyama; Y. Inada; Guo Qing Zheng

doi:10.1143/JPSJS.77SA.348

Nuclear spin-lattice relaxation in non-centrosymmetric superconductors Li₂(Pd,Pt)₃B

M. Kandatsu, M. Nishiyama, Y. Inada, Guo Qing Zheng

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

2 Citations (Scopus)

Abstract

We present ¹¹B nuclear magnetic resonance (NMR) measurements in superconductors Li₂(Pd,Pt)₃B without inversion symmetry. In Li₂Pd₃B, the spin lattice relaxation rate 1/T ₁ shows a well-defined coherence peak below T_c, and follows an exponential temperature variation exp(-Δ/k_BT) at low temperatures. At a magnetic field of 1.46 T, the energy gap Δ was found to be 1.1k_BT_c, but it recovers to 1.5k_BT _c at a field of 0.44 T, which is quite close to the value 1.75k _BT_c for a weak coupling BCS superconductor. This behavior is in contrast to that found in Li₂Pt₃B where 1/T ₁ is proportional to T³, and the difference between the two compounds is ascribed to the different strength of spin orbit coupling.

Original language	English
Pages (from-to)	348-349
Number of pages	2
Journal	journal of the physical society of japan
Volume	77
Issue number	SUPPL.A
DOIs	https://doi.org/10.1143/JPSJS.77SA.348
Publication status	Published - Jan 1 2008

Keywords

LiPdB
LiPtB
NMR
Superconductivity

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1143/JPSJS.77SA.348

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title = "Nuclear spin-lattice relaxation in non-centrosymmetric superconductors Li2(Pd,Pt)3B",

abstract = "We present 11B nuclear magnetic resonance (NMR) measurements in superconductors Li2(Pd,Pt)3B without inversion symmetry. In Li2Pd3B, the spin lattice relaxation rate 1/T 1 shows a well-defined coherence peak below Tc, and follows an exponential temperature variation exp(-Δ/kBT) at low temperatures. At a magnetic field of 1.46 T, the energy gap Δ was found to be 1.1kBTc, but it recovers to 1.5kBT c at a field of 0.44 T, which is quite close to the value 1.75k BTc for a weak coupling BCS superconductor. This behavior is in contrast to that found in Li2Pt3B where 1/T 1 is proportional to T3, and the difference between the two compounds is ascribed to the different strength of spin orbit coupling.",

keywords = "LiPdB, LiPtB, NMR, Superconductivity",

author = "M. Kandatsu and M. Nishiyama and Y. Inada and Zheng, {Guo Qing}",

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AU - Kandatsu, M.

AU - Nishiyama, M.

AU - Inada, Y.

AU - Zheng, Guo Qing

PY - 2008/1/1

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N2 - We present 11B nuclear magnetic resonance (NMR) measurements in superconductors Li2(Pd,Pt)3B without inversion symmetry. In Li2Pd3B, the spin lattice relaxation rate 1/T 1 shows a well-defined coherence peak below Tc, and follows an exponential temperature variation exp(-Δ/kBT) at low temperatures. At a magnetic field of 1.46 T, the energy gap Δ was found to be 1.1kBTc, but it recovers to 1.5kBT c at a field of 0.44 T, which is quite close to the value 1.75k BTc for a weak coupling BCS superconductor. This behavior is in contrast to that found in Li2Pt3B where 1/T 1 is proportional to T3, and the difference between the two compounds is ascribed to the different strength of spin orbit coupling.

AB - We present 11B nuclear magnetic resonance (NMR) measurements in superconductors Li2(Pd,Pt)3B without inversion symmetry. In Li2Pd3B, the spin lattice relaxation rate 1/T 1 shows a well-defined coherence peak below Tc, and follows an exponential temperature variation exp(-Δ/kBT) at low temperatures. At a magnetic field of 1.46 T, the energy gap Δ was found to be 1.1kBTc, but it recovers to 1.5kBT c at a field of 0.44 T, which is quite close to the value 1.75k BTc for a weak coupling BCS superconductor. This behavior is in contrast to that found in Li2Pt3B where 1/T 1 is proportional to T3, and the difference between the two compounds is ascribed to the different strength of spin orbit coupling.

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