Abstract
Measurements of the surface nucleation field and the bulk supercooling field , made on pure tantalum, show that these fields are identical only when , and that measurable supercooling occurs at all temperatures between and 1.4°K. The measurements verify qualitatively the recent theoretical work of Park. Nearly ideal supercooling of the bulk cylindrical samples is achieved by using small auxiliary-field coils to field coils to eliminate nucleation at the sample ends. A new value for the Ginzburg-Landau parameter of the pure metal is derived from the data.
- Received 21 October 1968
DOI:https://doi.org/10.1103/PhysRevLett.22.229
©1969 American Physical Society