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  Antiferromagnetic order with short correlation length and Kondo interactions in U2PdGa3 and U2PtGa3

Tran, V. H., Steglich, F., & André, G. (2002). Antiferromagnetic order with short correlation length and Kondo interactions in U2PdGa3 and U2PtGa3. Physical Review B, 65(13): 134401, pp. 134401-134401. doi:10.1103/PhysRevB.65.134401.

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 Urheber:
Tran, V. H.1, Autor           
Steglich, F.2, Autor           
André, G., Autor
Affiliations:
1Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863404              
2Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863467              

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 Zusammenfassung: 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.

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Sprache(n): eng - English
 Datum: 2002-04-01
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: eDoc: 18532
ISI: 000174903900077
DOI: 10.1103/PhysRevB.65.134401
 Art des Abschluß: -

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Titel: Physical Review B
  Alternativer Titel : Phys. Rev. B
Genre der Quelle: Zeitschrift
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 65 (13) Artikelnummer: 134401 Start- / Endseite: 134401 - 134401 Identifikator: ISSN: 0163-1829