Abstract
An overview is given of recent muon spin rotation-relaxation (µSR) measurements of magnetic penetration depths, λ(T), on the YBa2Cu4O8, Y2Ba4Cu7O15-δ and Bi-based cuprates, and of the interplay of magnetic ordering with superconductivity in the simpler double-layer cuprate La2MCu2O6+ δ , M=(Sr,Ca). The dependence of T c on carrier concentration in the Y2Ba4Cu7O15-δ family is similar to that of the YBa2Cu3Ox, almost linear, but monotonically increasing to the maximum T c =90K, and with a gentler slope. Available data for Bi(Pb)SrCaCuO samples of different stoichiometries depart from such general trends and are rather iconsistent sample-to-sample, indicating that extrinsic factors (vortex lattice morphology and pinning effects, uncontrolled defect structures) can not be separated from the intrinsic (mechanisms, electronic and crystalline structure) behaviour of the mixed state for the Bi-based cuprate superconductors as yet. Static magnetic order was determined for the first time for La2MCu2O6+ δ ,M=(Sr,Ca). Oxygen excess results in a superconducting phase separating for M=Ca (similar to La2CuO4+ δ ), but not for the M=Sr samples. In general, the results underscore the crucial rôle played by inhomogeneities and defect structures in the magnetic properties.
New results presented here were obtained at TRIUMF (Canadian meson facility, Vancouver, B. C.) in collaboration with the TRIUMF-UBC µSR group, on samples prepared and characterized by the CSIC (Barcelona) and DSIR (New Zealand) groups led by X. Obradors and J. Talton, respectively.
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Ansaldo, E.J. (1991). Recent µSR Results on Magnetic Properties of Cuprate Materials. In: Ashkenazi, J., Barnes, S.E., Zuo, F., Vezzoli, G.C., Klein, B.M. (eds) High-Temperature Superconductivity. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-3338-2_47
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DOI: https://doi.org/10.1007/978-1-4615-3338-2_47
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