论文标题
在单晶结构中，在高压下的两个定性超导阶段$ _ {3} $
Two qualitatively different superconducting phases under high pressure in single-crystalline CeNiGe$_{3}$
论文作者
论文摘要
我们已经测量了在静水压力下单晶cenige $ _ {3} $中电阻率的温度依赖性，以建立特征性压力温度相图。在环境压力下的过渡温度$ t _ {\ rm n1} $ = 5.5 k最初会随着压力的增加而增加，最大为$ \ sim $ 3.0 $ 3.0 GPA。高于2.3 GPA，观察到明显的零耐药性（SC-I相），并且这种超导（SC）与AFM-I相共存。 SC-1相突然在3.7 GPA同时消失，出现与相对于AFM-II相的相对应的附加扭结异常。随着压力进一步增加，AFM-II阶段不断抑制，并以$ \ sim $ 6.5 GPA消失。在临界压力附近的狭窄范围内，SC相位出现（SC-II相）。上临界场的大初始斜率$μ_0H_ {\ rm C2} $和非FERMI液体行为表明SC-II相是由抗铁磁波动介导的。另一方面，SC-I相和AFM-I相的稳健共存与大多数重毛力化合物的量子临界点附近的超导性相反。
We have measured the temperature dependence of resistivity in single-crystalline CeNiGe$_{3}$ under hydrostatic pressure in order to establish the characteristic pressure-temperature phase diagram. The transition temperature to AFM-I phase $T_{\rm N1}$ = 5.5 K at ambient pressure initially increases with increasing pressure and has a maximum at $\sim$ 3.0 GPa. Above 2.3 GPa, a clear zero-resistivity is observed (SC-I phase) and this superconducting (SC) state coexists with AFM-I phase. The SC-I phase suddenly disappears at 3.7 GPa simultaneously with the appearance of an additional kink anomaly corresponding to the phase transition to AFM-II phase. The AFM-II phase is continuously suppressed with further increasing pressure and disappears at $\sim$ 6.5 GPa. In the narrow range near the critical pressure, an SC phase reappears (SC-II phase). A large initial slope of upper critical field $μ_0H_{\rm c2}$ and non-Fermi liquid behavior indicate that the SC-II phase is mediated by antiferromagnetic fluctuations. On the other hand, the robust coexistence of the SC-I phase and AFM-I phase is unusual on the contrary to superconductivity near a quantum critical point on most of heavy-fermion compounds.
