Unusual Kondo behavior in the indium-rich heavy-fermion antiferromagnet Ce3Pt4In13

Article

关键词: THERMOELECTRIC-POWER;    CRYSTALLINE FIELD;    PRESSURE;    TEMPERATURE;    CERIUM;    ALLOYS;    CEPDSB;   

DOI  :  10.1103/PhysRevB.65.024401

来源: SCIE

【 摘 要 】

We report the thermodynamic, magnetic., and electronic transport properties of the ternary intermetallic system (Ce, La)(3)Pt4In13. Ce3Pt4In13 orders antiferromagnetically at 0.95 K, while the nonmagnetic compound La3Pt4In13 is a conventional 3.3-K superconductor. Kondo lattice effects appear to limit the entropy associated with the Neel transition to (1/4)R In 2 as an electronic contribution to the specific heat of gamma similar to 1 J/mole Ce K-2 is observed at T-N; roughly 35% of this gamma survives the ordering transition. Hall effect, thermoelectric power. and ambient-pressure resistivity measurements confirm this interpretation. These results suggest that RKKY and Kondo interactions are closely balanced in this compound (T(N)approximate toT(K)). Contrary to expectations based on the Doniach Kondo necklace model, applied hydrostatic pressure modestly enhances the magnetic ordering temperature with dT(N)/dP = +23 mK/kbar. As such Ce3Pt4In13 provides a counterexample to Kondo systems with similar Kondo and RKKY energy scales, wherein applied pressure enhances T-K at the expense of the ordered magnetic state.

【 授权许可】

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