Investigation of magnetic order in SmTr2Zn20 (Tr = Fe, Co, Ru) and SmTr2Cd20 (Tr = Ni, Pd)

Article

关键词: ELECTRON-MAGNON INTERACTION;    PHYSICAL-PROPERTIES;    SUPERCONDUCTIVITY;    TEMPERATURE;    TRANSITION;    EARTH;    FERROMAGNETISM;    RESISTIVITY;    SMOS4SB12;    CECR2AL20;   

DOI  :  10.1103/PhysRevB.90.144406

来源: SCIE

【 摘 要 】

Single crystals of the cage compounds SmTr2Zn20 (Tr= Fe, Co, Ru) and SmTr2Cd20 (Tr= Ni, Pd) have been investigated by means of electrical resistivity, magnetization, and specific-heat measurements. The compounds SmFe2Zn20, SmRu2Zn20, and SmNi2Cd20 exhibit ferromagnetic order with Curie temperatures of T-C = 47.4, 7.6, and 7.5 K, respectively, whereas SmPd2Cd20 is an antiferromagnet with a Neel temperature of T-N = 3.4 K. No evidence for magnetic order is observed in SmCo2Zn20 down to 110 mK. The Sommerfeld coefficients gamma are found to be 57 mJ/mol K-2 for SmFe2Zn20, 79.5 mJ/mol K-2 for SmCo2Zn20, 258 mJ/mol K-2 for SmRu2Zn20, 165 mJ/mol K-2 for SmNi2Cd20, and 208 mJ/mol K-2 for SmPd2Cd20. Enhanced values of gamma and a quadratic temperature dependence of the electrical resistivity at low temperature for SmRu2Zn20 and SmPd2Cd20 suggest an enhancement of the quasiparticle masses due to hybridization between localized 4 f and conduction electron states.

【 授权许可】

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