Abstract
Muon spin rotation (µSR) studies on high temperature superconducting (HTS) cuprates will be reviewed. After an introduction to the technique, studies of the superfluid density will be described and the universal variation of the superfluid density n s as a function of [hole concentration] p will be discussed. Important exceptions will be noted, such as the YBa2Cu3O7−δ system, where, besides the intrinsically superconducting CuO2 planes, an interlayer may be metallized (here the CuO chains) which consequently contributes to a significant enhancement in superfluid density and associated improvement in technologically interesting properties such as flux pinning and critical current density. A common phase diagram of the antiferromagnetic correlations for Sr doped La2CuO4 and Ca doped YBa2Cu3O6 and, in particular the coexistence of strong electronic magnetism within the superconducting state, will be discussed in terms of µSR experiments in zero external magnetic field.
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