A Superconducting Alloy with Resistance Temperature Hysteresis

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IN some experiments made in collaboration with J. F. Allen and J. O. Wilhelm, we found that the resistance of a ternary alloy of bismuth, lead, and tin dropped slowly with temperature in the usual manner down to 9° K., where it suddenly fell to zero. On raising the temperature, the alloy remains superconducting up to a temperature of 13.2° K., at which point the resistance reappeared and rose quickly to a steady value at 13.8° K. This would appear to be the first time that a resistance temperature hysteresis effect has been observed and measured.

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