Abstract
We give a brief review of the major contributions of the muon spin relaxation (µSR) technique to the science of layered copper oxides. These include (i) establishment of the conventional nature of the gap function. unlike that found for heavy fermion systems such as UPt3 (ii) absolute values for the magnetic penetration depths (iii) identification of the inhomogeneous nature of the superconductivity in ceramic La2-x Srx CuO4 with x away from “optimal” value (0.15), and (iv) demonstration of local moment ordering at low temperatures near the metal-insulator transition in La2-x Srx CuO4. We also sketch the results of complementary neutron scattering and transport investigations on a sample near the metal-insulator transition. These experiments provide good evidence for a strong coupling between charge and spin degrees of freedom. as well as the marginal Fermi Liquid hypothesis in the normal state.
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