R. Mullmann et al., A EU-151 MOSSBAUER SPECTROSCOPIC AND MAGNETIC-SUSCEPTIBILITY INVESTIGATION OF THE INTERMETALLIC COMPOUNDS EUTIN (T = ZN, PD, PT, AU), Journal of solid state chemistry, 137(1), 1998, pp. 174-180
The title compounds were investigated by magnetic susceptibility measu
rements and Eu-151 Mossbauer spectroscopy. EuZnIn and EuPtIn show Curi
e-Weiss behavior above 60 K with experimental magnetic moments of 7.80
(5) and 8.0(1) mu(B)/Eu, respectively, indicating divalent europium. T
he zinc compound orders antiferromagnetically at T-N = 8.0(5) K and no
field induced transition is observed. EuPtIn orders antiferromagnetic
ally in small external fields at 16.0(5) K and two metamagnetic transi
tions 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) mu(B)/Eu, suggesting a full parallel spin alignment. EuPdIn and Eu
AuIn order antiferromagnetically at 13.0(5) and 21.0(5) K in low exter
nal magnetic fields, respectively. The four compounds are metallic con
ductors. The Mossbauer measurements of the EuTIn compounds show (EU)-E
-151 isomer shifts typical of divalent europium. The isomer shifts are
found to be linearly correlated with the closest Eu-Eu distance in th
e structure. Based on the Mossbauer data the onset of magnetic order i
s observed at T-N(EuZnIn) = 9.5(5) K, T-N(EuPdIn) 15.5(5) K, T-N(EuAuI
n) = 20.0(5) K, and T-N(EuPtIn) = 20.0(5) K, respectively. The magneti
cally split spectrum of EuZnIn reveals evidence of Eu site inequivalen
ce. (C) 1998 Academic Press.