A151Eu Mössbauer Spectroscopic and Magnetic Susceptibility Investigation of the Intermetallic Compounds EuTIn (T=Zn, Pd, Pt, Au)
✍ Scribed by Ralf Müllmann; Bernd D. Mosel; Hellmut Eckert; Gunter Kotzyba; Rainer Pöttgen
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- English
- Weight
- 371 KB
- Volume
- 137
- Category
- Article
- ISSN
- 0022-4596
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✦ Synopsis
The title compounds were investigated by magnetic susceptibility measurements and 151 Eu Mo¨ssbauer spectroscopy. EuZnIn and EuPtIn show Curie-Weiss behavior above 60 K with experimental magnetic moments of 7.80(5) and 8.0(1) B / Eu, respectively, indicating divalent europium. The zinc compound orders antiferromagnetically at T N ؍ 8.0(5) K and no field induced transition is observed. EuPtIn orders antiferromagnetically in small external fields at 16.0(5) K and two metamagnetic transitions are detected at the critical field strengths B C1 ؍ 1.1(1) T and B C2 ؍ 2.6(2) T. At 5 K the saturation magnetic moment amounts to 7.0(1) B / Eu, suggesting a full parallel spin alignment. EuPdIn and EuAuIn order antiferromagnetically at 13.0(5) and 21.0(5) K in low external magnetic fields, respectively. The four compounds are metallic conductors. The Mo¨ssbauer measurements of the EuTIn compounds show 151 Eu isomer shifts typical of divalent europium. The isomer shifts are found to be linearly correlated with the closest Eu-Eu distance in the structure. Based on the Mo¨ssbauer data the onset of magnetic order is observed at T N (EuZnIn) ؍ 9.5(5) K, T N (EuPdIn) ؍ 15.5(5) K, T N (EuAuIn) ؍ 20.0(5) K, and T N (EuPtIn) ؍ 20.0(5) K, respectively. The magnetically split spectrum of Eu-ZnIn reveals evidence of Eu site inequivalence.