Intrinsic Impurity in the High Temperature Superconductor Bi2Sr2CaCu2O8+δ
Abstract
The 17O NMR spectra of Bi2Sr2CaCu2O8+δ (Bi-2212) single crystals were measured in the temperature range from 4 K to 200 K and magnetic fields from 3 to 29 T, reported here principally at 8 T. The NMR linewidth of the oxygen in the CuO2 plane was found to be magnetically broadened with the temperature dependence of a Curie law where the Curie coefficient decreases with increased doping. This inhomogeneous magnetism is an impurity effect intrinsic to oxygen doping and persists unmodified into the superconducting state.
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