Vortexlike excitations in the heavy-fermion superconductor CeIrIn5

Article

关键词: ZERO-TEMPERATURE LIMIT;    PRESSURE;    THERMOELECTRICITY;    CERHIN5;    CECOIN5;    NQR;   

DOI  :  10.1103/PhysRevB.93.201102

来源: SCIE

【 摘 要 】

We report a systematic study of temperature- and field-dependent charge (rho) and entropy (S) transport in the heavy-fermion superconductor CeIrIn5. Its large positive thermopower S-xx is typical of Ce-based Kondo lattice systems, and strong electronic correlations play an important role in enhancing the Nernst signal S-xy. By separating the off-diagonal Peltier coefficient alpha(xy) from S-xy, we find that alpha(xy) becomes positive and greatly enhanced at temperatures well above the bulk T-c. Compared with the nonmagnetic analog LaIrIn5, these results suggest vortexlike excitations in a precursor state to unconventional superconductivity in CeIrIn5. This study sheds light on the similarity of heavy-fermion and cuprate superconductors and on the possibility of states not characterized by the amplitude of an order parameter.

【 授权许可】

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