Superconductivity of ε-Fe:: complete resistive transition
Superconductivity of ε-Fe:: complete resistive transition
复制标题
DOI：
10.1016/s0375-9601(02)00725-9
复制
发表时间：
2002-07-01
影响因子：
2.6
通讯作者：
Onuki, Y
中科院分区：
文献类型：
--
作者：
Jaccard, D;Holmes, AT;Onuki, Y
去年据报道，铁在高温下变成超导体，低于2K和压力在15和30GPa之间，Nature 412（2001）316。所提出的证据是微弱的电阻率下降，被0.2 T以上的磁场抑制。和一个小迈斯纳信号然而，缺乏令人信服的证明，如零抵抗的发生。在这里，我们报告的测量一个完整的电阻转变在22.2 GPa的起始略高于2 K在两个非常纯的铁样品，不同的起源。超导性对无序异常敏感，只有当电子平均自由程超过阈值时才会发展，而正常状态的电阻率是近铁磁金属的特征。(C)2002 Elsevier Science B.V.保留所有权利。
Last year. iron was reported. to become superconducting at temperatures., below 2 K and pressures between 15 and 30 GPa, Nature 412 (2001) 316. The evidence presented was a weak resistivity drop, suppressed by a magnetic field above 0.2 T. and a small Meissner Signal. However, a compelling demonstration, such as the occurrence of zero resistance, was lacking. Here we report the measurement of a complete resistive transition at 22.2 GPa with an onset slightly above 2 K in two very pure samples of iron, of different origins. The superconductivity appears unusually sensitive to disorder, developing only when (lie electronic mean free path is above a threshold value, while the normal state resistivity is characteristic of a nearly ferromagnetic metal. (C) 2002 Elsevier Science B.V. All rights reserved.