Superconductivity in YbxMyHfNCl (M=NH3 and THF)
Guojun Ye, Jianjun Ying, Yajun Yan, Xigang Luo, Peng Cheng, Ziji Xiang, Aifeng Wang, Xianhui Chen
DOI 10.1103/PhysRevB.86.134501 · Physical Review B
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Abstract
We report the observation of superconductivity in rare-earth metal cointercalated compounds Ybx(M)yHfNCl with M = NH3 and tetrahydrofuran (THF). The superconducting transition temperature is about 23 and 24.6 K for Yb0.2(NH3)yHfNCl and Yb0.3(NH3)yHfNCl, respectively. Replacing the NH3 with a larger molecule THF, the superconducting transition temperature increases to 25.2 K in Yb0.2(THF)yHfNCl, which is almost the same as the highest Tc reported in the alkali-metal intercalated HfNCl superconductors. The Tc of Yb0.2(THF)yHfNCl is apparently suppressed by pressure up to 0.5 GPa, while the pressure effect on Tc 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Yb0.2(NH3)yHfNCl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 23 | Pressure not reported | onset |
| Yb0.3(NH3)yHfNCl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 24.6 | Pressure not reported | onset |
| Yb0.2(THF)yHfNCl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25.2 | Pressure not reported | onset |
| KxTiNCl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 16 | Pressure not reported | unknown |
| Lix(THF)yHfNCl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25.5 | Pressure not reported | unknown |
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