Abstract
The electron paramagnetic resonance (EPR) spectrum of Cr5+(3d1,S=1/2) in undeuterated and 58%-deuterated NH4H2AsO4 was investigated. The EPRg-value tensors in the paraelectric and antiferroelectric phases are almost the same as those observed at high and low temperatures in KH2PO4 and KH2AsO4. This shows that the (Cr5+O4)H2 complex is the same in all crystals, i.e., a wave function ofdx2−y2 character coupled to two lateral protons which reorient among the four possible Slater configurations in the paraelectric phase. The remarkable isotope shift of the local dynamic reorientational slowing-down observed in KH2PO4 and KH2AsO4 in approximate proportion to the shift of the bulk ferroelectric transition temperaturesTcF, and the antiferroelectricTcAF of NH4H2AsO4, is analyzed qualitatively. It is shown to result mainly from the isotope effect of the short-range interactionJsr via protons and deuterons for the impurity and for the bulk.
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