⁷⁵As NMR studies of polar clusters above T_c in KH₂AsO₄

Abstract

All essential features of the anomalous ⁷⁵As NMR spectrum in the non-polar phase of potassium dihydrogen phosphate (KDA) may be explained in terms of spectral density peaks which result from the formation of polar clusters. The available data is very well described in terms of an application of the elementary Slater model. Methods of extracting the polarization distribution function are discussed.