L. Deakin et al., Rare-earth germanium antimonides RE6Ge5-Sb11+ (RE = La-Nd, Sm, Gd-Dy). II.Magnetic and transport properties, INORG CHEM, 40(5), 2001, pp. 960-965
Magnetic and transport properties have been measured for the series of tern
ary rare-earth germanium antimonides RE6Ge5-xSb11+x (RE = La-Nd, Sm, Gd-Dy)
. All are metallic, with the members containing RE other than La displaying
kinks in their resistivity vs temperature curves; the To and Dy members ex
hibit Kondo-like behavior with resistivity minima occurring at 10 and 150 K
, respectively. For the compounds with RE = Ce, Pr, Nd, Sm, Gd, Tb, the mag
netic susceptibility and electrical resistivity measurements reveal long-ra
nge antiferromagnetic ordering with T-N less than or equal to 22 K. At 2 K,
the Ce, Pr, and Nd members undergo metamagnetic transitions at critical fi
elds between 1.0 and 4.0 T, while the Gd member displays spin-flop behavior
with H-SF = 1.85 T and H-C = 5.75 T. The single-crystal magnetoresistance
of the Gd member below Th shows an orientationally dependent steplike behav
ior of resistivity as a function of field with changes in resistivity coinc
iding with the same critical fields observed in the magnetization measureme
nts.