On the edge of periodicity: Unconventional magnetism of Gd117Co56.4Sn114.3

JOURNAL OF ALLOYS AND COMPOUNDS

卷:726

Article

Liu, J.^1,2,5  Mudryk, Y.¹  Ryan, D. H.^3,4  Pecharsky, V. K.^1,2 

[1] Iowa State Univ, Ames Lab, US DOE, Ames, IA 50011 USA

[2] Iowa State Univ, Dept Mat Sci & Engn, Ames, IA 50011 USA

[3] McGill Univ, Phys Dept, 3600 Univ St, Montreal, PQ H3A 2T8, Canada

[4] McGill Univ, Ctr Phys Mat, 3600 Univ St, Montreal, PQ H3A 2T8, Canada

[5] Seagate Technol, Bloomington, IL USA

关键词: Rare earth alloys and compounds;    Magnetization;    Magnetic frustration;    Heat capacity;    Mossbauer;   

DOI  :  10.1016/j.jallcom.2017.08.009

来源: Elsevier

【 摘 要 】

Magnetization measurements reveal the onset of magnetic ordering at T-c = 65 K followed by three additional magnetic anomalies at T-1 = 47 K, T-2 = 28 K, and T-3 = 11 K in Gd117Co56.4Sn114.3 - a compound with a giant cubic unit cell that crystallizes in the Dy117Co56Sn112 structure type with space group Fm(3)over-barm and lattice parameter a= 30.186 angstrom . The magnetic ordering temperature increases with applied magnetic field; however, the analysis of magnetic data indicates that antiferromagnetic interactions also play a role in the ground state. AC magnetic susceptibility confirms multiple magnetic anomalies and shows minor frequency dependence. The local magnetic ordering below 60 K is supported by the Mossbauer spectroscopy. A single broad anomaly is detected at T-3 in the heat capacity; we suggest that magnetic domains form below this temperature. These data highlight unique features of magnetism in this and, potentially, other rare-earth intermetallics crystallizing with giant unit-cells where the exchange correlation lengths are much shorter when compared to the periodicity of the crystal lattice. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

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