Abstract
Abstract A comparison of the tunnel curves of superconducting La Pr, La Y and La Gd reveals that the character of the tunneling density of states of La Pr is between that of the BCS- and that of the Abrikosov-Gorkov theory. This is expected on theoretical grounds for pair-breaking caused by ions in a singlet ground state. The predicted crystal field induced structures in the tunnel curves could not be detected.
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