Superconductivity in YbxMyHfNCl (M = NH3 and THF)

Article

关键词: TUNNELING SPECTROSCOPY;    LAYERED SUPERCONDUCTOR;    SPIN;    METALS;   

DOI  :  10.1103/PhysRevB.86.134501

来源: SCIE

【 摘 要 】

We report the observation of superconductivity in rare-earth metal cointercalated compounds Yb-x(M)(y)HfNCl with M = NH3 and tetrahydrofuran (THF). The superconducting transition temperature is about 23 and 24.6 K for Yb-0.2(NH3)(y)HfNCl and Yb-0.3(NH3)(y)HfNCl, respectively. Replacing the NH3 with a larger molecule THF, the superconducting transition temperature increases to 25.2 K in Yb-0.2(THF)(y)HfNCl, which is almost the same as the highest T-c reported in the alkali-metal intercalated HfNCl superconductors. The T-c of Yb-0.2(THF)(y)HfNCl is apparently suppressed by pressure up to 0.5 GPa, while the pressure effect on T-c becomes very small above 0.5 GPa. Our results suggest that for the most part, the superconductivity in these layered intercalated superconductors does not rely on intercalated metal ions, even magnetic ions.

【 授权许可】

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