A new unconventional antiferromagnet, Yb3Pt4

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:321

Article

Bennett, M. C.^1,2  Khalifah, P.^3,4  Sokolov, D. A.^1,3  Gannon, W. J.¹  Yiu, Y.^1,2  Kim, M. S.^1,3  Henderson, C.⁵  Aronson, M. C.^1,2,3 

[1] Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA

[2] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11974 USA

[3] Brookhaven Natl Lab, Upton, NY 11973 USA

[4] SUNY Stony Brook, Dept Chem, Stony Brook, NY 11974 USA

[5] Univ Michigan, Electron Microbeam Anal Lab, Ann Arbor, MI 48109 USA

关键词: Antiferromagnet;    Binary intermetallic;    Magnetic susceptibility;    Specific heat;    Resistivity;    Fermi liquid;   

DOI  :  10.1016/j.jmmm.2009.01.029

来源: Elsevier

【 摘 要 】

We report the synthesis and basic properties of single crystals of a new binary compound, Yb3Pt4. The Yb ions in this compound are fully trivalent, and heat capacity measurements show that the crystal field scheme involves a doublet ground state, well separated from the excited states, which are fully occupied above similar to 150 K. The heat capacity displays a large, weakly first order anomaly at 2.4 K, where a cusp is observed in the magnetic susceptibility signalling the onset of antiferromagnetic order. The entropy associated with this order is the full Rln2 of the doublet ground state, however, the magnetic susceptibility in the ordered phase is dominated by a large and temperature independent component below the Neel temperature. The heat capacity in the ordered state originates with ferromagnetic spin waves, giving evidence for the inherently local moment character of the ordered state. The electrical resistivity is unusually large, and becomes quadratic in temperature exactly at the Neel temperature. The absence of analogous Fermi liquid behavior in the heat capacity and the magnetic susceptibility implies that Yb3Pt4 is a low electron density system, where the Fermi surface is further gapped by the onset of magnetic order. (C) 2009 Elsevier B. V. All rights reserved.

【 授权许可】

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