Different metamagnetism between paramagnetic Ce and Yb isomorphs

Article

关键词: HEAVY-FERMION COMPOUND;    KONDO-LATTICE;    TRANSPORT-PROPERTIES;    MAGNETIC-PROPERTIES;    PHASE-DIAGRAM;    SUSCEPTIBILITY;    TRANSITION;    RESISTIVITY;    CENI2GE2;    BEHAVIOR;   

DOI  :  10.1103/PhysRevB.96.085127

来源: SCIE

【 摘 要 】

To solve the puzzle of metamagnetic phenomena in heavy-fermion systems, we have compared paramagnetic isostructural Ce and Yb systems, CeNi2Ge2 and YbNi2Ge2, both of which are located near a magnetic instability. The most intriguing result is the discovery of ametamagneticlike anomaly for isomorphicCe and Yb paramagnetic systems from magnetization measurements in a pulsed magnetic field. Similar to other metamagnets, the metamagnetic transition fields for both compounds are well scaled by the temperature T-chi(max)., at which the magnetic susceptibility shows a maximum. In addition, for CeNi2Ge2, a peak of nonlinear susceptibility chi(3) appears at approximately T-chi(max)/2, as for other heavy-fermion metamagnets. In contrast, YbN2Ge2 shows only a sign change for chi(3) at T-chi(max)., as observed in itinerantmetamagnets located near the ferromagnetic critical point. The metamagnetism of CeNi2Ge2 corresponds to a typical Kondo lattice system, whereas that of YbNi2Ge2 is similar to the nearly ferromagnetic itinerant systems. Other possibilities for the metamagnetic behavior of YbNi2Ge2 are also discussed.

【 授权许可】

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