We have measured critical currents I c of an evaporated Cu x Mo6S8 (x = 2.5±0.3) film as a function of an external perpendicular field B up to the upper critical field B c2, at several temperatures (T ⩽ 4.2K). Results for the pinning force per unit length F = I c B 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/B c2, respectively. By comparing data with other evaporated and sputtered Cu x Mo6S8 with x ⩽ 2, we have separated the pinning force into two parts, each one obeying a scaling law. The recently published phase diagram of Cu x Mo6S8, along with our results, suggests that critical current and pinning in this material are controlled by two superconducting phases.
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National Research Council Senior Research Associate, on leave of absence from Department of Physics, Tel Aviv University, Tel Aviv, Israel.
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Alterovitz, S.A., Woollam, J.A. Critical current and scaling laws in evaporated two-phase Cu2.5Mo6S8 . J Low Temp Phys 32, 839–851 (1978). https://doi.org/10.1007/BF00056662
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DOI: https://doi.org/10.1007/BF00056662