Institute of Physics, Polish Academy of Sciences, Warsaw, Poland.
J Phys Condens Matter. 2012 Jul 4;24(26):265701. doi: 10.1088/0953-8984/24/26/265701. Epub 2012 May 31.
The pressure dependence, up to 11.3 kbar, of basic parameters of the superconducting state, such as the critical temperature (T(c)), the lower and the upper critical fields, the coherence length, the penetration depth, and their anisotropy, was determined from magnetic measurements performed for two single-crystalline samples of FeTe(0.5)Se(0.5). We have found pressure-induced enhancement of all of the superconducting state properties, which entails a growth of the density of superconducting carriers. However, we noticed a more pronounced increase in the superconducting carrier density under pressure than that in the critical temperature which may indicate an appearance of a mechanism limiting the increase of T(c) with pressure. We have observed that the critical current density increases under pressure by at least one order of magnitude.
我们从两个 FeTe(0.5)Se(0.5) 单晶样品的磁测量中确定了超导状态基本参数（如临界温度 (T(c))、下临界场和上临界场、相干长度、穿透深度及其各向异性）的压力依赖性，最高可达 11.3 kbar。我们发现所有超导状态特性都受到压力的增强，这意味着超导载流子密度的增加。然而，我们注意到超导载流子密度在压力下的增加比临界温度更为明显，这可能表明出现了一种限制 T(c)随压力增加的机制。我们观察到临界电流密度在压力下至少增加了一个数量级。
