Nuclear spin coherence in superconducting Nb₃Sn

2025/02/01 by Gan Zhai, Zhai, Gan, W. P. Halperin +10
Engineering · Physics and Astronomy · #FOS: Physical sciences #Physics of Superconductivity and Magnetism #Quantum, superfluid, helium dynamics #Superconducting Materials and Applications #Superconductivity (cond-mat.supr-con)

paper · pdf · doi:10.48550/arxiv.2502.00566

openalex publication_date 2025/02/01 · openalex created_date 2025/02/05 · openalex updated_date 2026/07/28

Abstract

We have investigated the normal and superconducting states of the technologically important compound Nb₃Sn using ⁹³Nb nuclear magnetic resonance. From spin-lattice relaxation we find strong suppression of the zero-temperature superconducting order parameter by magnetic field. Additionally we have identified an anomalously large electron-nuclear exchange interaction from spin-spin relaxation measurements, an order of magnitude beyond that of the nuclear dipolar coupling. This RKKY interaction evolves from normal to superconducting states, becoming essentially Lorentzian in the low temperature limit.

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