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          Institute: MPI für Chemische Physik fester Stoffe     Collection: publications 2002     Display Documents

ID: 18532.0, MPI für Chemische Physik fester Stoffe / publications 2002
Antiferromagnetic order with short correlation length and Kondo interactions in U2PdGa3 and U2PtGa3
Authors:Tran, V. H.; Steglich, F.; André, G.
Date of Publication (YYYY-MM-DD):2002-04-01
Title of Journal:Physical Review B
Journal Abbrev.:Phys. Rev. B
Issue / Number:13
Start Page:134401
End Page:134401
Sequence Number of Article:134401
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:We report the results of magnetic susceptibility, magnetoresistance, specific heat, and neutron-powder- diffraction measurements on U2PdGa3 and U2PtGa3. The investigated compounds crystallize in the orthorhombic CeCu2- type structure (space group Imma) and, at T(N)approximate to30 K, undergo an antiferromagnetic state with finite magnetic correlation lengths 120-150 Angstrom. The magnetic structure is collinear and with the uranium magnetic moments aligned parallel to the orthorhombic c axis. At 1.4 K, the uranium magnetic moments are estimated to be about (0.3-0.4)mu(B)/U. Despite showing the signature of three-dimensional almost long- range antiferromagnetic order below 30 K in the dc-magnetic susceptibility, for both compounds a discontinuity in the specific heat at their Neel temperatures is lacking. Furthermore, the dc-magnetic susceptibility displays magnetic- history phenomena, while the magnetoresistance data indicate the existence of Kondo interactions in the magnetically ordered state. We discuss the observed magnetic behavior in terms of a competition between randomness, Kondo and magnetic exchange interactions.
Comment of the Author/Creator:Date: 2002, APR 1
External Publication Status:published
Document Type:Article
Communicated by:Ina Wanschura
Affiliations:MPI für chemische Physik fester Stoffe
External Affiliations:Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany; Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany; Polish Acad Sci, W Trzebiatowski Inst Low Temp & Struct Res, PL-50950 Wroclaw, Poland; CEA Saclay, CNRS, Lab Leon Brillouin, F-91191 Gif Sur Yvette, France
Identifiers:ISI:000174903900077 [ID No:1]
ISSN:0163-1829 [ID No:2]
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