Magnetism and superconductivity in U2PtxRh1-xC2

Article

关键词: IMPURITIES;    FERROMAGNETISM;    MAGNETORESISTANCE;    TEMPERATURE;    UPD2AL3;    ALLOYS;    U2PTC2;    URHGE;    UNIGA;    UBE13;   

DOI  :  10.1103/PhysRevB.91.024408

来源: SCIE

【 摘 要 】

We report the phase diagram of the doping series U2PtxRh1-xC2, studied through measurements of resistivity, specific heat, and magnetic susceptibility. The Neel temperature of U2RhC2 of similar to 22 K is suppressed with increasing Pt content, reaching zero temperature close to x = 0.7, where we observed signatures of increased quantum fluctuations. In addition, evidence is presented that the antiferromagnetic state undergoes a spin-reorientation transition upon application of an applied magnetic field. This transition shows nonmonotonic behavior as a function of x, peaking at around x = 0.3. Superconductivity is observed for x >= 0.9, with T-c increasing with increasing x. The reduction in Tc and increase in residual resistivity with decreasing Pt content is inconsistent with the extension of the Abrikosov-Gor'kov theory to unconventional superconductivity.

【 授权许可】

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