Evolution of the local superconducting density of states in ErRh$_4$B$_{4}$ close to the ferromagnetic transition

Details Evolution of the local superconducting density of states in ErRh$_4$B$_{4}$ close to the ferromagnetic transition Evolution of the local superconducting density of states in ErRh$_4$B$_{4}$ close to the ferromagnetic transition

2009-02-02

arxiv.org/abs/0902.0308v1

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures

Scientific paper

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.

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