UNSPECIFIED. (1999) Point-contact study of the magnetic superconductor HoNi2B2C. PHYSICA C, 319 (3-4). pp. 189-196. ISSN 0921-4534

Abstract

Point contacts (PC) based on the magnetic superconductor HoNi2B2C with a superconducting onset temperature T-c similar to 8.5 K have been investigated in order to determine the temperature and magnetic field dependences of the superconducting order parameter. The temperature dependence of the order parameter satisfies the Bardeen-Cooper-Schrieffer (BCS) theory only below the BCS transition temperature T-c(BCS) = 55-5.8 K, which exceeds slightly the Neel temperature T-N similar to 5.0 K. At higher temperatures, above T-N, the PC spectra dV/dI(V) indicate an anomalous, most likely gapless, superconducting state. At magnetic fields well below H-c2, a considerable increase (similar to 30%) in the characteristic voltage of the gap-related structure in the PC spectra is observed which points to an improved spin alignment with a decreasing influence of the pair breaking in modest fields. (C) 1999 Elsevier Science B.V. All rights reserved.

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