Non-Fermi-liquid behavior at the antiferromagnetic quantum critical point in the heavy-fermion system Ce(Cu1-xCox)(2)Ge-2

Article

关键词: THERMOELECTRIC-POWER;    KONDO-LATTICE;    TRANSPORT-PROPERTIES;    SPIN FLUCTUATIONS;    GRIFFITHS PHASE;    MAGNETIC ORDER;    CECU2GE2;    SUPERCONDUCTIVITY;    CE;    TEMPERATURE;   

DOI  :  10.1103/PhysRevB.98.165136

来源: SCIE

【 摘 要 】

Polycrystalline samples of Ce(Cu1-xCox)(2)Ge-2 were investigated by means of electrical resistivity rho(T), magnetic susceptibility chi(T), specific heat C-p(T), and thermoelectric power S(T) measurements. The long-range antiferromagnetic order, which set in at T-N = 4.1 K in CeCu2Ge2, is suppressed by non-isoelectronic cobalt doping at a critical value of the concentration x(c) = 0.6, accompanied by non-Fermi-liquid behavior inferred from the power-law dependence of heat capacity and susceptibility, i.e., C(T )/T and chi(T) proportional to T-1+lambda, down to 0.4 K, along with a clear deviation from T-2 behavior of the electrical resistivity. However, we have not seen any superconducting phase in the quantum critical regime down to 0.4 K.

【 授权许可】

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