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Title: Controlling Magnetism via Transition Metal Exchange in the Series of Intermetallics Eu(T1,T2)5In (T = Cu, Ag, Au)

Journal Article · · Journal of Materials Chemistry C
DOI:https://doi.org/10.1039/C7TC04964A· OSTI ID:1410343
 [1];  [1];  [2];  [2]
  1. Stockholm Univ., Stockholm (Sweden)
  2. Ames Lab. and Iowa State Univ., Ames, IA (United States)

Three series of intermetallic compounds Eu(T1,T2)5In (T = Cu, Ag, Au) have been investigated in full compositional ranges. Single crystals of all compounds have been obtained by self-flux and were analyzed by single X-ray diffraction revealing the representatives to fall into two structure types: CeCu6 (oP28, Pnma, a = 8.832(3)–9.121(2) Å, b = 5.306(2)–5.645(1) Å, c = 11.059(4)–11.437(3) Å, V = 518.3(3)–588.9(2) Å3) and YbMo2Al4 (tI14, I4/mmm, a = 5.417(3)–5.508(1) Å, c = 7.139(2)– 7.199(2) Å, V = 276.1(2)–285.8(1) Å3). The structural preference was found to depend on the cation/anion size ratio, while the positional preference within the CeCu6 type structure shows an apparent correlation with the anion size. Chemical compression, hence, a change in cell volume, which occurs upon anion substitution appears to be the main driving force for the change of magnetic ordering. While EuAg5In shows antiferromagnetic behavior at low temperatures, mixing Cu and Au within the same type of structure results in considerable changes in the magnetism. The Eu(Cu,Au)5In alloys with CeCu6 structure show complex magnetic behaviors and strong magnetic field-induced spin-reorientation transition with the critical field of the transition being dependent on Cu/Au ratio. The alloys adopting the YbMo2Al4 type structure are ferromagnets exhibiting unusually high magnetic moments. The heat capacity of EuAu2.66Cu2.34In reveals a double-peak structure evolving with the magnetic field. Furthermore, low-temperature X-ray powder diffraction does not show a structural transition.

Research Organization:
Ames Lab., Ames, IA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
1410343
Report Number(s):
IS-J-9502; JMCCCX
Journal Information:
Journal of Materials Chemistry C, Vol. 6; ISSN 2050-7526
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 1 work
Citation information provided by
Web of Science

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