We report the observation of inhomogeneous superconductivity (ISC) in the recently discovered high-density nonmagnetic (NM) phase of Co in thin films below an onset temperature ( ##IMG## [http://ej.iop.org/images/0295-5075/131/4/47001/epl20262ieqn1.gif] {$T_{\mathrm{C}}$} ) of 5.4 K in the absence of external magnetic field, via four-probe measurements of resistivity. Further, the point-contact spectroscopy studies also confirm superconductivity in this system. We attribute the observed ISC to the presence of nanoscale grains of high-density non-magnetic Co (FCC structure) in a thin film of conductive, normal Co (HCP structure) which is magnetic. Incomplete superconducting transition found in the bulk measurements suggests that the observed phenomenon is due to ISC of nanoscale grains of NM phase of Co. In addition, using first-principles density functional and BCS theoretical analysis of Co under hydrostatic and volume-preserving-biaxial strains, we demonst...

中文翻译：

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多晶Co膜中高密度非磁性钴的不均匀超导

我们报告了在开始温度以下的薄膜中最近发现的Co的高密度非磁性（NM）相中观察到的不均匀超导（ISC）（## IMG ## [http://ej.iop.org/images/通过四探针电阻率测量，在不存在外部磁场的情况下0295-5075 / 131/4/47001 / epl20262ieqn1.gif] {$ T _ {\ mathrm {C}} $}）为5.4K。此外，点接触光谱研究还证实了该系统的超导性。我们将观察到的ISC归因于在磁性的导电普通Co（HCP结构）薄膜中存在高密度非磁性Co（FCC结构）的纳米级晶粒。大量测量中发现的不完全超导转变表明，观察到的现象是由于Co NM相纳米级晶粒的ISC引起的。此外，