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Title: Magnetocaloric behavior in ternary europium indides EuT5In: Probing the design capability of first-principles-based methods on the multifaceted magnetic materials

Journal Article · · Chemistry of Materials

The most favorable structures and the types of magnetic ordering predicted from first-principles-based methods in a family of closely related transition-metal-rich indides EuT5In (T = Cu, Ag, Au) are gauged against relevant experiments. The EuT5In compounds adopt a different structure for each different coinage metal—EuCu5In (hR42; R$$\overline{3}$$m, a = 5.0933(7), c = 30.557(6) Å), EuAg5In (oP28; Pnma, a = 9.121(2), b = 5.645(1), c = 11.437(3) Å), and EuAu5In (tI14; I4/mmm, a = 7.1740(3), c = 5.4425(3) Å)—and crystallize with the Sr5Al9, CeCu6, and YbMo2Al4 structure types, respectively. EuCu5In and EuAg5In order antiferromagnetically at TN = 12 and 6 K, respectively, whereas EuAu5In is ferromagnetic below TC = 13 K. EuCu5In exhibits complex magnetism: after the initial drop at TN, the magnetization rises again below 8 K, and a weak metamagnetic-like transition occurs at 2 K in μ0H = 1.8 T. The electronic heat capacity of EuCu5In, γ = ~400 mJ/(mol K2), points to strong electronic correlations. Spin-polarized densities of states suggest that the magnetic interactions in the three materials studied are supported via mixing 4f and 5d states of Eu. As a result, a chemical bonding analysis based on the Crystal Orbital Hamilton populations reveals the tendency to maximize overall bonding as a driving force to adopt a particular type of crystal structure.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
1357782
Report Number(s):
IS-J-9324
Journal Information:
Chemistry of Materials, Vol. 29, Issue 6; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 26 works
Citation information provided by
Web of Science

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Controlling magnetism via transition metal exchange in the series of intermetallics Eu(T1,T2) 5 In (T = Cu, Ag, Au) journal January 2018
Revealing the Nature of Bonding in Rare-Earth Transition-Metal Tellurides by Means of Methods Based on First Principles: Revealing the Nature of Bonding in Rare-Earth Transition-Metal Tellurides by Means of Methods Based on First Principles journal July 2017
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