4f hybridization effect on the magnetism of Nd2PdSi3

Article

关键词: SPIN-GLASSES;    BEHAVIOR;    MAGNETORESISTANCE;    PHOTOEMISSION;    ANOMALIES;    DY2PDSI3;    TB2PDSI3;    GD2PDSI3;    ALLOYS;   

DOI  :  10.1103/PhysRevB.84.184415

来源: SCIE

【 摘 要 】

Among the members of the series R2PdSi3 (R = rare earth), the magnetic behavior of the Nd compound is interesting in some respects. This compound is considered to order ferromagnetically (<16 K), unlike other members of this series, which order antiferromagnetically. In addition, the magnetic ordering temperature (T-o) is significantly enhanced with respect to the de Gennes-scaled value. To understand the magnetism of this compound better, we have investigated the magnetic behavior in detail (and under external pressure) and examined its solid solutions based on substitutions at Nd and at Si sites, viz., on the series, Nd2-x(Y, La)(x)PdSi3-yGey (x, y = 0.2, 0.4, 0.8, and 1.2) by bulk measurements. The results overall establish that Nd2PdSi3 orders ferromagnetically below 16 K but an antiferromagnetic (AFM) component seems to set in at very low temperatures. However, there is significant suppression of T-o for Y and Ge substitutions compared to the La substitution for a given magnitude of unit cell volume change, qualitatively correlating with the separation between the layers of Nd and Pd-Si(Ge). On the basis of this observation, we conclude that 4f(Nd) hybridization plays a major role on the magnetism of the former solid solutions. To our knowledge, this work serves as a rare demonstration of the 4f hybridization effects on the magnetism of a Nd-based intermetallic compound.

【 授权许可】

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