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Title: On the edge of periodicity: Unconventional magnetism of Gd 117Co 56.4Sn 114.3

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 Gd 117Co 56.4Sn 114.3 – a compound with a giant cubic unit cell that crystallizes in the Dy 117Co 56Sn 112 structure type with space group Fm3¯m and lattice parameter a = 30.186 Å. 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 Mössbauer spectroscopy. A single broad anomaly is detected at T 3 in the heat capacity; we suggest that magnetic domains form below this temperature. Furthermore, 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.
Authors:
 [1] ; ORCiD logo [2] ;  [3] ;  [2]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States); Seagate Technology, Bloomington, MN (United States)
  2. Ames Lab. and Iowa State Univ., Ames, IA (United States)
  3. McGill Univ., Montreal, QC (Canada)
Publication Date:
Report Number(s):
IS-J-9410
Journal ID: ISSN 0925-8388; PII: S0925838817327378
Grant/Contract Number:
AC02-07CH11358
Type:
Accepted Manuscript
Journal Name:
Journal of Alloys and Compounds
Additional Journal Information:
Journal Volume: 726; Journal Issue: C; Journal ID: ISSN 0925-8388
Publisher:
Elsevier
Research Org:
Ames Lab., Ames, IA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; rare earth alloys and compounds; magnetization; magnetic frustration; heat capacity; Mössbauer
OSTI Identifier:
1374753