Intrinsic Impurity in the High Temperature Superconductor Bi_2Sr_2CaCu_2O$_{8+δ}$

Chen, Bo; Mukhopadhyay, Sutirtha; Halperin, W. P.; Guptasarma, Prasenjit; Hinks, D. G.

Intrinsic Impurity in the High Temperature Superconductor Bi_2Sr_2CaCu_2O$_{8+δ}$

Authors

Chen, Bo

Mukhopadhyay, Sutirtha

Halperin, W. P.

Guptasarma, Prasenjit

Hinks, D. G.

Description

The {}^{17}O NMR spectra of Bi_2Sr_2CaCu_2O$_{8+δ}$ (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 CuO_{2} 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.
10 pages, 5 figures