Observation of a superconducting glass state in granular superconducting diamond
Observation of a superconducting glass state in granular superconducting diamond
复制标题
粒状超导金刚石中超导玻璃态的观察
作者：
G. Klemencic;J. M. Fellows;J. Werrell;S. Mandal;S. Giblin;Robert A. Smith;O. Williams
报道了纳米晶掺硼金刚石薄膜超导电性的磁场依赖性。的超导玻璃态的证据，证明了由观察到的准德阿尔梅达无磁线的相图和对数时间依赖性的磁性。通过对准零维涨落电导率理论的详细拟合，从电输运数据确定了H-T平面中相边界的位置。这允许以比标准的特设起始/中点/偏移标准更高的精度来确定电阻行为和非电阻行为之间的边界。我们把这种玻璃态的超导电性归因于金刚石薄膜的形貌粒度。
The magnetic field dependence of the superconductivity in nanocrystalline boron doped diamond thin films is reported. Evidence of a superconducting glass state is presented, as demonstrated by the observation of a quasi de Almeida-Thouless line in the phase diagram and a logarithmic time dependence of the magnetism. The position of the phase boundary in the H-T plane is determined from electrical transport data by detailed fitting to quasi-zero-dimensional fluctuation conductivity theory. This allows determination of the boundary between resistive and non-resistive behaviour to be made with greater precision than the standard ad hoc onset/midpoint/offset criterion. We attribute the glassy superconductivity to the morphological granularity of the diamond films.