Pressure studies of the quantum critical alloy Ce0.93Yb0.07CoIn5

Article

关键词: HEAVY-FERMION SUPERCONDUCTIVITY;    MAGNETORESISTANCE;    STATE;   

DOI  :  10.1103/PhysRevB.91.174506

来源: SCIE

【 摘 要 】

Here we present our experimental and theoretical study of the effects of pressure on the transport properties of the heavy-fermion alloy Ce1-xYbxCoIn5 with actual concentration x approximate to 0.07. We specifically choose this value of ytterbium concentration because the magnetic-field-induced quantum critical point, which separates the antiferromagnetic and paramagnetic states at zero temperature, approaches zero, as has been established in previous studies. Our measurements show that pressure further suppresses quantum fluctuations in this alloy, just as it does in the parent compound CeCoIn5. In contrast, the square-root temperature-dependent part of resistivity remains insensitive to pressure, indicating that the heavy quasiparticles are not involved in the inelastic scattering processes leading to such a temperature-dependent resistivity. We demonstrate that the growth of the coherence temperature with pressure, as well as the decrease of the residual resistivity, can be accurately described by employing the coherent potential approximation for a disordered Kondo lattice.

【 授权许可】

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