Evidence for a generic novel quantum transition in high-Tc cuprates

Details Evidence for a generic novel quantum transition in high-Tc cuprates Evidence for a generic novel quantum transition in high-Tc cuprates

2002-04-04

arxiv.org/abs/cond-mat/0204106v1

Physical Review B 66, 064501 (2002); also includes more data and refs

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.66.064501

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 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 novel quantum transition that separates the superconducting phase diagram of HTS into two distinct ground states.

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