Electronic and Magnetic Properties of Rare Earth Compounds RPt2Ge2 (R: La–Ho)

概要

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We succeeded in growing the single crystals of RPt2Ge2 (R: La–Ho) with the monoclinic LaPt2Ge2-type structure. Most of RPt2Ge2 compounds order antiferromagnetically, approximately following the de Gennes scaling. Among them, CePt2Ge2 with a Néel temperature $T_{\text{N1}} = 2.4$ K indicates a change of the magnetic structure below $T_{\text{N2}} = 1.8$ K, with an ordered moment of 0.70 $\mu_{\text{B}}$/Ce. The pressure experiment was also carried out for CePt2Ge2 by measuring the electrical resistivity. The critical pressure, where the Néel temperature becomes zero, is 7–8 GPa at which the heavy fermion state is realized. Superconductivity was, however, not observed experimentally.
Physical Society of Japanの論文
2009-11-15