Evolution of the local superconducting density of states in ErRh${}_4$B${}_4$ close to the ferromagnetic transition

Abstract

We present local tunneling spectroscopy experiments in the superconducting and ferromagnetic phases of the reentrant superconductor ErRh${}_4$B${}_4$. The tunneling conductance curves jump from showing normal to superconducting features within a few mK close to the ferromagnetic transition temperature, with a clear hysteretic behavior. Within the ferromagnetic phase, we do not detect any superconducting correlations. Within the superconducting phase we find a peculiar V-shaped density of states at low energies, which is produced by the magnetically modulated phase that coexists with superconductivity just before ferromagnetism sets in.

5 pages, 4 figures

References in corpus (3)

• Scanning tunneling spectroscopy with superconducting tips of Al
• Zooming into the coexisting regime of ferromagnetism and superconductivity in ErRh4B4 single crystals
• Density of states in SF bilayers with arbitrary strength of magnetic scattering

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