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Large adiabatic temperature change and magnetic frustration in triangular lattice antiferromagnet Dy2IrSi3

Journal Article · · Journal of Alloys and Compounds
 [1];  [1];  [2];  [3];  [2];  [2];  [1]
  1. Saha Institute of Nuclear Physics, Kolkata (India)
  2. Ames Laboratory, and Iowa State University, Ames, IA (United States)
  3. Tata Institute of Fundamental Research, Bombay (India)
While previous studies reveal that the formation of polycrystalline R2TX3 (R = rare-earth, T = transition metal, X = p-block element) type compounds with T = Ir and Co is not achievable without deliberate introduction of atomic vacancies of Ir/Co and Si, here we report successful synthesis of Dy2IrSi3 with fully stoichiometric ratio of constituent elements. An antiferromagnetic transition is manifested in the compound at 6.6 K where only about 50 % of Dy spins take part, while the rest remain in highly frustrated state due to edge-sharing triangular lattice geometry. The magnetic frustration is conclusively probed through magnetization, heat capacity and magnetocaloric study and the frustration parameter (f = |θp|/TN, θp, TN being Curie-Weiss and Néel temperatures, respectively) in this case is as large as ~ 3. An additional cluster-glass type transition at ~2.8 K observed in this system has likely been originated due to this magnetic frustration. The magnetocaloric effect reveals an adiabatic temperature change of ~7.5 K for 70 kOe magnetic field, which is one of the largest values reported in intermetallic compounds.
Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
2299900
Alternate ID(s):
OSTI ID: 2369842
Report Number(s):
IS-J--11,262
Journal Information:
Journal of Alloys and Compounds, Journal Name: Journal of Alloys and Compounds Vol. 981; ISSN 0925-8388
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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