Nuclear spin-lattice relaxation rate in electron-doped Pr0.91LaCe0.09CuO4-y: Constraint on the gap symmetry

作者：Zhao Guo meng^*

来源：Physics Letters A, 2011, 375(40): 3525-3528.

DOI：10.1016/j.physleta.2011.08.010

We present numerical calculations of the nuclear spin-lattice relaxation (R-s) rate in the superconducting state of pure indium and slightly underdoped n-type cuprate Pr0.91LaCe0.09CUO4-y. By properly taking into account electron-phonon coupling, our calculated R-s for the conventional s-wave superconductor, indium, is in quantitative agreement the experimental data with a clear Hebel-Slichter peak. In contrast, the absence of the Hebel-Slichter peak in the R-s data of Pr0.91LaCe0.09CUO4-y can be explained by either d-wave or highly anisotropic s-wave gap symmetry. Thus, the absence of the Hebel-Slichter peak does not necessarily argue against an s-wave gap symmetry in this electron-doped cuprate.

• 出版日期2011-9-19