Abstract
We present a structural investigation of the organic charge-transfer salt superconductor κ-(BEDT-TTF)2Cu[N(CN)2]Br at a temperature of 90 K using high energy (90 keV) powder x-ray diffraction. With this approach we access the scattering profile over a wide range in Q-space (from ~ 0.3 to 19 Å−1). Overall, the observed scattering intensity is understood as a superposition of Bragg diffraction from a crystalline phase superimposed onto a large quasi-amorphous signal, indicative of short range order effects in our powder material. We discuss implications of these findings regarding the structural properties of this material.
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