UNSPECIFIED. (1991) HIGH-ENERGY CRYSTAL-FIELD EXCITATIONS IN PRXY1-XBA2CU3O7-DELTA. BULLETIN OF MATERIALS SCIENCE, 14 (3). pp. 613-617. ISSN 0250-4707

Abstract

We have measured the high energy crystalline electric field transitions in samples of Pr(x)Y1-xBa2Cu3O7-delta with x almost-equal-to 0.5 and x almost-equal-to 1. The fully Pr-doped samples exhibits three strong transitions with excitation energies of about 65, 85 and 105 meV, plus three more weaker ones at 113, 123 and 132 meV. Magnetic intensity is observed in the same energy range in the x = 0.5 sample but is largely structureless in character, with only one clear peak at about 109 meV. The large number of transitions would seem to indicate a Pr valence of 3 +, rather than 4 +, but the intrinsically broad character of the excitations is evidence for a dynamically mixed valence state.

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