Possible formation of a nonuniform superconducting state in the heavy-fermion compoundUPd2Al3

Abstract
Thermal expansion and magnetostriction measurements on single crystalline UPd2 Al3, a very clean, strongly Pauli-limited, heavy-fermion superconductor (Tc≃1.82 K), have been utilized to establish a first-order transition at TT̃≃1.5 K and B<Bc2(T). This is ascribed to the hitherto unobserved formation of a nonuniform superconducting state, as pedicted theoretically in 1963.

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