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

C. S. Lue*, T. H. Su, H. F. Liu, Ben-Li Young

*Corresponding author for this work

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22 Scopus citations


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
Issue number5
StatePublished - 25 Aug 2011

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