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Title: Synthesis, Structure, and Complex Magnetism of MIr 2In 8 (M = Eu, Sr)

In this paper, we report the synthesis, crystal structure, and physical properties of two new polar intermetallic compounds, EuIr 2In 8 and SrIr 2In 8. Both were synthesized in good yield using In metal as a reactive flux medium, enabling the growth of large crystals for physical property measurements. They crystallize in the orthorhombic space group Pbam with the CeFe 2Al 8 structure type, which is sometimes also referred to as the CaCo 2Al 8 structure type. The two analogues have unit cell parameters of a = 13.847(3) Å, b = 16.118(3) Å, and c = 4.3885(9) Å for M = Eu and a = 13.847(3) Å, b = 16.113(3) Å, and c = 4.3962(9) Å for M = Sr at room temperature. SrIr 2In 8 is a diamagnetic metal with no local magnetic moments on either the Sr or Ir sites, and the diamagnetic contribution from core electrons overwhelms the expected Pauli paramagnetism normally seen in intermetallic compounds. Magnetism in EuIr 2In 8 is dominated by the local Eu moments, which order antiferromagnetically at 5 K in low applied fields. Increasing the field strength depresses the magnetic ordering temperature and also induces a spin reorientation at lower temperature, indicatingmore » complex competing magnetic interactions. Finally, low-temperature heat capacity measurements show a significant enhancement of the Sommerfeld coefficient in EuIr 2In 8 relative to that in SrIr 2In 8, with estimated values of γ = 118(3) and 18.0(2) mJ mol –1 K –2, respectively.« less
 [1] ;  [2] ;  [1] ;  [3] ;  [3] ;  [4]
  1. Northwestern Univ., Evanston, IL (United States). Dept. of Chemistry
  2. Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy; Ames Lab., Ames, IA (United States). Division of Materials Science and Engineering
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
  4. Northwestern Univ., Evanston, IL (United States). Dept. of Chemistry; Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
Publication Date:
Grant/Contract Number:
AC02-07CH11358; DMR-1121262; 10-203031
Accepted Manuscript
Journal Name:
Inorganic Chemistry
Additional Journal Information:
Journal Volume: 55; Journal Issue: 6; Journal ID: ISSN 0020-1669
American Chemical Society (ACS)
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States); Ames Lab., Ames, IA (United States); Northwestern Univ., Evanston, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF); State of Illinois Dept. of Commerce and Economic Opportunity (United States); Northwestern Univ. (United States)
Contributing Orgs:
Iowa State Univ., Ames, IA (United States)
Country of Publication:
United States
OSTI Identifier: