We have measured critical currents Ic of an evaporated CuxMo6S8 (x = 2.5±0.3) film as a function of an external perpendicular field B up to the upper critical field Bc2, at several temperatures (T ≤ 4.2K). Results for the pinning force per unit length F = IcB do not obey a scaling law. That is, F = K(T)f (b), where K and f are general functions of the temperature T and the reduced field b = B/Bc2, respectively. By comparing data with other evaporated and sputtered CuxMo6S8 with x ≤ 2, we have separated the pinning force into two parts, each one obeying a scaling law. The recently published phase diagram of CuxMo6S8, along with our results, suggests that critical current and pinning in this material are controlled by two superconducting phases.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Materials Science(all)
- Condensed Matter Physics