Apparatus for Measuring the Temperature Corresponding to the Transformation of Metals and Alloys into the Superconducting State
A method of measuring critical temperatures from 4.2 to 20°K is described; it is based on a special new apparatus for measuring the magnetic permeability of samples and is accurate to 0.2°K. The measuring method is simple and gives reliable and reproducible results even if the amount of superconducting phase in the samples is under 0.5.10-4 cm3. In measuring alloys containing two or several superconducting phases, the transitional curves give characteristic steps; the temperatures of these steps correspond to the TK of the phases present. The method may also be used for the phase analysis of superconducting alloys.
KeywordsCritical Temperature Magnetic Permeability Superconducting State Superconducting Phase Critical Curve
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