Abstract
We present the results of the magnetic susceptibility, magnetization, specific-heat, and electrical resistivity measurements on rare-earth iridium germanides Ce3Ir2Ge2 and La3Ir2Ge2, crystallizing in the La3Ni2Ga2-type orthorhombic crystal structure. The results reveal that Ce3Ir2Ge2 is a Kondo-lattice system showing characteristic −lnT dependence of magnetic resistivity at high temperatures, while there does not exist evident sign of long-range magnetic ordering at least down to 1.8 K. Instead, a short-range magnetic correlation occurs at about 3.5 K. The La-based compound was found to be a type-II superconducting material with a relatively high critical temperature TC=4.7K. A number of the relevant parameters, such as lower critical field, upper critical field, coherence length, penetration depth, and Ginzburg–Landau parameter, were estimated for the La3Ir2Ge2 sample.
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