Evidence for s-wave superconductivity in noncentrosymmetric Re 24Nb5 from 93Nb NMR measurements

Chin-Shan Lue, T. H. Su, H. F. Liu, Ben Li Young

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

We report a 93Nb nuclear magnetic resonance (NMR) study on the noncentrosymmetric superconductor Re24Nb5. Below the superconducting temperature Tc(H), the spin susceptibility probed by the 93Nb NMR Knight shift gradually decreases with lowering temperature, accompanied by the broadening of the resonance spectrum. Such behavior is commonly observed in the BCS-type superconductors. The 93Nb NMR spin-lattice relaxation rate (1/T1) shows a well-defined coherence peak just below Tc(H), followed by a marked decrease with further decreasing temperature. Moreover, the 1/T1 data in the superconducting state were found to obey a single exponential expression, yielding a nodeless gap Δ/kB=10.3 K. This value gives the ratio of 2Δ/k BTc(H)=3.55, that is almost identical with the value of 3.5 predicted from BCS theory. On these bases, we conclude that the noncentrosymmetric Re24Nb5 compound can be characterized as a weakly coupled BCS-type superconductor.

Original languageEnglish
Article number052509
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume84
Issue number5
DOIs
Publication statusPublished - 2011 Aug 25

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Magnetic resonance measurement
Superconductivity
Superconducting materials
superconductivity
Nuclear magnetic resonance
nuclear magnetic resonance
Spin-lattice relaxation
Temperature
BCS theory
spin-lattice relaxation
temperature
magnetic permeability

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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title = "Evidence for s-wave superconductivity in noncentrosymmetric Re 24Nb5 from 93Nb NMR measurements",
abstract = "We report a 93Nb nuclear magnetic resonance (NMR) study on the noncentrosymmetric superconductor Re24Nb5. Below the superconducting temperature Tc(H), the spin susceptibility probed by the 93Nb NMR Knight shift gradually decreases with lowering temperature, accompanied by the broadening of the resonance spectrum. Such behavior is commonly observed in the BCS-type superconductors. The 93Nb NMR spin-lattice relaxation rate (1/T1) shows a well-defined coherence peak just below Tc(H), followed by a marked decrease with further decreasing temperature. Moreover, the 1/T1 data in the superconducting state were found to obey a single exponential expression, yielding a nodeless gap Δ/kB=10.3 K. This value gives the ratio of 2Δ/k BTc(H)=3.55, that is almost identical with the value of 3.5 predicted from BCS theory. On these bases, we conclude that the noncentrosymmetric Re24Nb5 compound can be characterized as a weakly coupled BCS-type superconductor.",
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Evidence for s-wave superconductivity in noncentrosymmetric Re 24Nb5 from 93Nb NMR measurements. / Lue, Chin-Shan; Su, T. H.; Liu, H. F.; Young, Ben Li.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 84, No. 5, 052509, 25.08.2011.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Evidence for s-wave superconductivity in noncentrosymmetric Re 24Nb5 from 93Nb NMR measurements

AU - Lue, Chin-Shan

AU - Su, T. H.

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AU - Young, Ben Li

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N2 - We report a 93Nb nuclear magnetic resonance (NMR) study on the noncentrosymmetric superconductor Re24Nb5. Below the superconducting temperature Tc(H), the spin susceptibility probed by the 93Nb NMR Knight shift gradually decreases with lowering temperature, accompanied by the broadening of the resonance spectrum. Such behavior is commonly observed in the BCS-type superconductors. The 93Nb NMR spin-lattice relaxation rate (1/T1) shows a well-defined coherence peak just below Tc(H), followed by a marked decrease with further decreasing temperature. Moreover, the 1/T1 data in the superconducting state were found to obey a single exponential expression, yielding a nodeless gap Δ/kB=10.3 K. This value gives the ratio of 2Δ/k BTc(H)=3.55, that is almost identical with the value of 3.5 predicted from BCS theory. On these bases, we conclude that the noncentrosymmetric Re24Nb5 compound can be characterized as a weakly coupled BCS-type superconductor.

AB - We report a 93Nb nuclear magnetic resonance (NMR) study on the noncentrosymmetric superconductor Re24Nb5. Below the superconducting temperature Tc(H), the spin susceptibility probed by the 93Nb NMR Knight shift gradually decreases with lowering temperature, accompanied by the broadening of the resonance spectrum. Such behavior is commonly observed in the BCS-type superconductors. The 93Nb NMR spin-lattice relaxation rate (1/T1) shows a well-defined coherence peak just below Tc(H), followed by a marked decrease with further decreasing temperature. Moreover, the 1/T1 data in the superconducting state were found to obey a single exponential expression, yielding a nodeless gap Δ/kB=10.3 K. This value gives the ratio of 2Δ/k BTc(H)=3.55, that is almost identical with the value of 3.5 predicted from BCS theory. On these bases, we conclude that the noncentrosymmetric Re24Nb5 compound can be characterized as a weakly coupled BCS-type superconductor.

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