Synthesis, Structure, and Complex Magnetism of MIr2In8 (M = Eu, Sr)

Nicholas P. Calta, Sergey L. Bud'ko, Alexandra P. Rodriguez, Fei Han, Duck Young Chung, Mercouri G Kanatzidis

Research output: Contribution to journalArticle

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Abstract

We report the synthesis, crystal structure, and physical properties of two new polar intermetallic compounds, EuIr2In8 and SrIr2In8. 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 CeFe2Al8 structure type, which is sometimes also referred to as the CaCo2Al8 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. SrIr2In8 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 EuIr2In8 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, indicating complex competing magnetic interactions. Low-temperature heat capacity measurements show a significant enhancement of the Sommerfeld coefficient in EuIr2In8 relative to that in SrIr2In8, with estimated values of γ = 118(3) and 18.0(2) mJ mol-1 K-2, respectively.

Original languageEnglish
Pages (from-to)3128-3135
Number of pages8
JournalInorganic Chemistry
Volume55
Issue number6
DOIs
Publication statusPublished - Mar 21 2016

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Magnetism
intermetallics
physical properties
paramagnetism
synthesis
metals
retraining
Intermetallics
field strength
Physical properties
magnetic moments
Metals
specific heat
analogs
Paramagnetism
moments
Temperature
crystal structure
augmentation
room temperature

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Physical and Theoretical Chemistry

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Synthesis, Structure, and Complex Magnetism of MIr2In8 (M = Eu, Sr). / Calta, Nicholas P.; L. Bud'ko, Sergey; Rodriguez, Alexandra P.; Han, Fei; Chung, Duck Young; Kanatzidis, Mercouri G.

In: Inorganic Chemistry, Vol. 55, No. 6, 21.03.2016, p. 3128-3135.

Research output: Contribution to journalArticle

Calta, NP, L. Bud'ko, S, Rodriguez, AP, Han, F, Chung, DY & Kanatzidis, MG 2016, 'Synthesis, Structure, and Complex Magnetism of MIr2In8 (M = Eu, Sr)', Inorganic Chemistry, vol. 55, no. 6, pp. 3128-3135. https://doi.org/10.1021/acs.inorgchem.6b00059
Calta, Nicholas P. ; L. Bud'ko, Sergey ; Rodriguez, Alexandra P. ; Han, Fei ; Chung, Duck Young ; Kanatzidis, Mercouri G. / Synthesis, Structure, and Complex Magnetism of MIr2In8 (M = Eu, Sr). In: Inorganic Chemistry. 2016 ; Vol. 55, No. 6. pp. 3128-3135.
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N2 - We report the synthesis, crystal structure, and physical properties of two new polar intermetallic compounds, EuIr2In8 and SrIr2In8. 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 CeFe2Al8 structure type, which is sometimes also referred to as the CaCo2Al8 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. SrIr2In8 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 EuIr2In8 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, indicating complex competing magnetic interactions. Low-temperature heat capacity measurements show a significant enhancement of the Sommerfeld coefficient in EuIr2In8 relative to that in SrIr2In8, with estimated values of γ = 118(3) and 18.0(2) mJ mol-1 K-2, respectively.

AB - We report the synthesis, crystal structure, and physical properties of two new polar intermetallic compounds, EuIr2In8 and SrIr2In8. 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 CeFe2Al8 structure type, which is sometimes also referred to as the CaCo2Al8 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. SrIr2In8 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 EuIr2In8 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, indicating complex competing magnetic interactions. Low-temperature heat capacity measurements show a significant enhancement of the Sommerfeld coefficient in EuIr2In8 relative to that in SrIr2In8, with estimated values of γ = 118(3) and 18.0(2) mJ mol-1 K-2, respectively.

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