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arXiv · 0902.0308

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

V. Crespo·J. G. Rodrigo·H. Suderow·S. Vieira·D. Hinks·I. K. Schuller
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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.

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V. Crespo, J. G. Rodrigo, H. Suderow, S. Vieira, D. Hinks, I. K. Schuller. 2009-02-02. Evolution of the local superconducting density of states in ErRh$_4$B$_{4}$ close to the ferromagnetic transition. https://doi.org/10.1103/physrevlett.102.237002

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