Effect of Deuterium Absorption on the Heavy-fermion Compound UPdIn

Abstract

The heavy fermion compound UPdIn is found to absorb deuterium without disproportionation to yield UPdInD0.7. Magnetization, heat capacity, x-ray, and neutron-diffraction measurements have been carried out to probe the structural and magnetic properties of this deuteride. It is found that deuterium absorption results in a highly anisotropic lattice expansion, without changing the Fe2P-type hexagonal structure of the parent compound. The magnetic ordering temperature is enhanced to 80 K and the low-temperature uranium moment to 2.5μB from their corresponding values of 21 K and 1.5μB, respectively, in the parent compound. Neutron-diffraction studies on the deuteride reveal antiferromagnetic ordering of the uranium moments and doubling of unit cell along the c axis. Heat capacity measurements show a large reduction in the value of electronic specific heat coefficient γ from 260 mJ mol-1 K-2 in UPdIn to 30 mJ mol-1 K-2 in UPdInD0.7, indicating a significant reduction in the hybridization between uranium 5f electrons and those on the surrounding atoms.

Department(s)

Physics

International Standard Serial Number (ISSN)

0163-1829

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 American Physical Society, All rights reserved.

Publication Date

01 Dec 2002

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