Low-frequency spins and the ground state in high-Tc cuprates

Physics – Condensed Matter – Superconductivity

Scientific paper

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Invited Paper: Post-muSR2002 Superconductivity Workshop

Scientific paper

10.1016/S0038-1098(02)00667-1

We study the spin fluctuations of pure and Zn-substituted high temperature superconductors (HTS) using the muon spin relaxation (muSR) technique. Superconductivity is found to coexist with low frequency spin fluctuations over a large region of the superconducting phase diagram. The characteristic temperature of spin fluctuations detected by muSR decreases with increasing doping and vanishes above a critical doping pc=0.19 where the normal state pseudogap vanishes. Furthermore, it is at pc that our penetration depth studies show an abrupt change in the doping dependence of the superfluid density. For p>pc the absolute value of the superfluid density is large and nearly independent of carrier concentration whereas for p

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