Abstract
Andreev-reflection spectra of superconducting-normal contacts with HoNi2B2C show a continuous increase of the superconducting order parameter at the antiferromagnetic phase transition TN = 5 K without re-entrant behaviour below the superconducting critical temperature Tc = 9 K. A change is found in the superconducting ground state at Tc* = 6.5 K (zero magnetic field), and the magnetic-field–temperature phase diagram corresponding to the two superconducting states is reconstructed.
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