Heat capacity study of the magnetic phases in a Nd5Ge3 single crystal

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:405

Article

Villuendas, D.¹  Tsutaoka, T.²  Hernandez Ferras, J. M.¹ 

[1] Univ Barcelona, Fac Fis, E-08028 Barcelona, Spain

[2] Hiroshima Univ, Grad Sch Educ, Hiroshima 7395824, Japan

关键词: Specific heat;    Field-induced phase transition;    Antiferromagnet;    Ferromagnet;    Gapped spin wave;    Schottky anomaly;   

DOI  :  10.1016/j.jmmm.2016.01.005

来源: Elsevier

【 摘 要 】

The different magnetic phases of the intermetallic compound Nd5Ge3 are studied in terms of the specific heat, in a broad range of temperatures (350 mK-140 K) and magnetic fields (up to 40 kOe). The expected T-3 and T-3/2 terms are not found in the antiferromagnetic (AFM) and ferromagnetic (FM) phases respectively, but a gapped T-2 contribution that originates from a mixture of AFM and FM interactions in different dimensionalities under a large magnetocrystalline anisotropy, is present in both. An almost identical Schottky anomaly, that arises from the hyperfine splitting of the nuclear levels of the Nd3+ ions, is observed in both phases, which leads us to state that the magnetic -field induced transition AFM -> FM that the system experiments below 26 K consists in the flip of the magnetic moments of the Nd ions, conserving the average local moment. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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