Nuclear spin-lattice relaxation rate and nonmagnetic pair-breaking effect in electron-doped Pr_0.91LaCe_0.09CuO_4-y: Signature of highly anisotropic s-wave gap

2010/03/29 by Guo‐meng Zhao, Zhao, Guo-meng
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Iron-based superconductors research #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #Superconductivity (cond-mat.supr-con)

paper · pdf · doi:10.48550/arxiv.1003.5701

openalex publication_date 2010/03/29 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We numerically calculate the nuclear spin-lattice relaxation rate (Rs) in the superconducting state in terms of anisotropic s-wave gaps. By taking into account electron-phonon coupling, our calculated Rs for a conventional s-wave superconductor, indium, is in quantitative agreement with the experimental data with a clear Hebel-Slichter peak. In contrast, by using the highly anisotropic s-wave gaps inferred from the magnetic penetration depth and scanning tunneling microscopy, our calculated Rs curves for electron-doped Pr_0.91LaCe_0.09CuO_4-y show no Hebel-Slichter peak, in agreement with the experimental data. Finally, the observed weak nonmagnetic pair-breaking effect provides unambiguous evidence for a highly anisotropic s-wave gap in this underdoped cuprate.

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