IN former experiments with a tin ring1 we found that, when Supraconductivity is destroyed by an electric current, the field-strength Hkj corresponding to the critical current is equal to the critical magnetic field-strength Hk. In order to measure Hkj we have now employed the exceedingly high thermal conductivity of He II. Through a tin wire of radius 0.0056 cm. immersed in He II, we were able to send an enormous current (1.5 × 105 amp./sq. cm.) without noticeably heating the wire or the helium, which enabled us to determine the entire transition curve.
L. Shubnikov, NATURE, 138, 545 (Sept. 26, 1936). L. W. Shubnikov and W. J. Chotkewitsch, Sow. Phys., in the press.
Shubnikov, Chotkewitsch, Schepelew and Rjabinin, ” Arbeiten auf dem Gebiete tiefer Temperaturen”, Sow. Phys., Sondernummer, June 1936, p. 48.
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SHUBNIKOV, L., ALEXEJEVSKI, N. Transition Curve for the Destruction of Supraconductivity by an Electric Current. Nature 138, 804 (1936). https://doi.org/10.1038/138804a0
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