Scaling of the magnetization in magnetic fields up to 30 T of UCu[sub 5[minus]x]Pd[sub x]: Evidence for a crossover from correlated to single-ion magnetic interactions upon cooling
- Department of Physics, University of Florida, Gainesville, Florida 32611-8440 (United States)
- NHMFL, Tallahassee, Florida 32310 (United States)
- Department of Physics, University of Florida, Gainesville, Florida 32611-8440 (United States) Institut fuer Physik, Universitaet Augsburg, D-86159 Augsburg (Germany)
Scaling of low-temperature magnetization data for the non-Fermi-liquid systems UCu[sub 4]Pd and UCu[sub 3.5]Pd[sub 1.5] in fields to 30 T is carried out to help determine the nature of the magnetic interactions above and below 10 K. The size of the scaling exponent [beta] found from this scaling with fields above 10 K implies that the higher-temperature magnetic excitations in UCu[sub 4]Pd are correlated, i.e., [beta][gt]1.0. For T[le]6 hthinsp;K, [beta][lt]1.0 for both UCu[sub 4]Pd and UCu[sub 3.5]Pd[sub 1.5] implying that the excitations may change and assume single-ion character, consistent with recent doping experiments. These results, which contradict a recent neutron-scattering study, may be understood theoretically as a depletion of the occupation of the phase space of magnetic excitations with decreasing temperature ( iff; energy), leading to a decoupling of the excitations. [copyright] [ital 1999] [ital The American Physical Society]
- OSTI ID:
- 6441631
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 60:9; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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