Volume Changes Associated with the Superconducting Transition

Measurements have been made of the length change associated with the superconducting transition of lead, tin, thallium, indium, and tantalum. For all the metals except tantalum, measurements were made between 1.5°K and 4.7°K and the length change observed ranged from ${10}^{-6\mathrm{}}$ cm to ${10}^{-8\mathrm{}}$ cm. The length change produced a capacitance change in the tank circuit of a stable $\mathrm{LC}$ oscillator and the length change was measured in terms of the resultant frequency change.