Anisotropic hybridization in the new Kondo lattice compound CeCoInGa3

Article

关键词: MAGNETIC-PROPERTIES;    HEAVY;    SUPERCONDUCTIVITY;    CE;   

DOI  :  10.1103/PhysRevB.98.115119

来源: SCIE

【 摘 要 】

We report a detailed and comparative study of the single-crystal CeCoInGa3 in both experiment and theory. Resistivity measurements reveal the typical behavior of a Kondo lattice with the onset temperature of coherence, T* approximate to 50 K. The magnetic specific heat can be well fitted using a spin-fluctuation model at low temperatures, yielding a large Sommerfeld coefficient, gamma approximate to 172 mJ/mol K-2 at 6 K, suggesting that this is a heavy-fermion compound with a pronounced coherence effect. The magnetic susceptibility exhibits a broad field-independent peak at T-chi and shows an obvious anisotropy within the be plane, reflecting the anisotropy of the coherence effect at high temperatures. These are compared with strongly correlated calculations combining first-principles band structure calculations and dynamical mean-field theory. Our results confirm the onset of coherence at about 50 K and reveal a similar anisotropy in the hybridization gap, pointing to a close connection between the hybridization strength of the low-temperature Fermi-liquid state and the high-temperature coherence effect.

【 授权许可】

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