title: Superconducting properties of protactinium.
abstract: The superconducting transition temperature and upper critical magnetic field of protactinium were measured by alternating-current susceptibility techniques. Since the superconducting behavior of protactinium is affected by its 5f electron character, it is clear now that protactinium is a true actinide element.
authors.forename: J L
authors.initials: JL
authors.lastname: Smith
authors.forename: J C
authors.initials: JC
authors.lastname: Spirlet
authors.forename: W
authors.initials: W
authors.lastname: Müller