Metamagnetism in EuPdIn and EuAuIn

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Abstract
EuPdIn and EuAuIn were prepared by reaction of the elemental components in tantalum tubes. They crystallize with the TiNiSi structure in space group Pnma and with Z= 4 formula units per unit cell. Both structures were refined from single-crystal X-ray data: a= 748.30(13) pm, b= 447.20(8) pm, c= 853.50(14) pm, V= 0.28562(5) nm3, wR2 = 0.0408, 449 F2 values, 20 variables for EuPdIn; and a= 755.2(2) pm, b= 472.2(1) pm, c= 842.3(2) pm, V= 0.3004(2) nm3, wR2 = 0.0470, 524 F2 values, 20 variables for EuAuIn. Magnetic susceptibility measurements show Curie–Weiss behaviour above 40 K for both compounds with experimental magnetic moments of 7.6(1)µB/Eu (EuPdIn) and 7.5(1)µB/Eu (EuAuIn), which are close to that of the free Eu2+ ion, namely µeff= 7.94 µB/Eu. At an external field strength of 0.01 T, EuPdIn and EuAuIn order antiferromagnetically at 13.0(5) and 21.0(5) K, respectively. Magnetization measurements at 5 K indicate metamagnetism with a magnetic moment of 5.9(1)µB/Eu at 5.5 T for both compounds. The critical fields amount to 3.1(1) T for EuPdIn and 0.25(2) T for EuAuIn. Both compounds are good metallic conductors with specific resistivities of 23 (EuPdIn) and 96 µΩ cm (EuAuIn) at room temperature.