Low-temperature heat transport of Nd2-xCexCuO4 single crystals

Article

关键词: MAGNETIC-FIELD DEPENDENCE;    QUASI-PARTICLE TRANSPORT;    DENSITY-OF-STATES;    THERMAL-CONDUCTIVITY;    PHASE-TRANSITIONS;    SPIN CORRELATIONS;    STRIPE CORRELATIONS;    VORTEX STATE;    ND2CUO4;    SUPERCONDUCTORS;   

DOI  :  10.1103/PhysRevB.90.024518

来源: SCIE

【 摘 要 】

We report a study of the Ce doping effect on the thermal conductivity (kappa) of Nd2-xCexCuO4 (NCCO) at low temperatures down to 0.3 K and in magnetic fields up to 14 T. It is found that with Ce doping, the electronic thermal conductivity increases; at the same time, the a-axis field-induced changes in kappa(H), associated with the spin flop and spin polarization of the Nd3+ sublattice, and the spin flop of the Cu2+ sublattice, gradually disappear. These are clearly due to the electron doping and the destruction of the antiferromagnetic orders. In the superconducting NCCO with x = 0.14 and 0.18, although the electronic thermal conductivity shows sizable field dependencies with H parallel to c, the paramagnetic scattering of phonons is still playing the dominant role in the heat transport, which is different from many other cuprates. In the lightly doped samples (x = 0.03 and 0.06), the low-T kappa(H) isotherms with H parallel to c show a steplike anomaly and are likely related to the spin/charge stripes.

【 授权许可】

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