Abstract

We present a brief account of measurements of the two-dimensional angular correlation of annihilation radiation (2D-ACAR) in a single crystal of approximate composition Bi 2Sr 2CaCu 2O 8+x, (T c = 85 K) at 6 and 92 K. The most noteworthy result is that the anisotropic part of the spectra displays a fine-structure which is sharpest at the highest of these two temperatures.

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