We study the low-energy spin fluctuations and superfluid density of a series of pure and Zn-substituted high-T-c superconductors (HTS) using the muon spin relaxation and ac-susceptibility techniques. At a critical doping state, p(c), we find (i) simultaneous abrupt changes in the magnetic spectrum and in the superconducting ground state and (ii) that the slowing down of spin fluctuations becomes singular at T=0. These results provide experimental evidence for a quantum transition that separates the superconducting phase diagram of HTS into two distinct ground states.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据