Tilting the balance towards d-wave in iron-based superconductors
Abstract
The intricate interplay of interactions and Fermiology can give rise to a close competition between nodeless (e.g. s-wave) and nodal (e.g. d-wave) order in electronically driven unconventional superconductors. We analyze how such a scenario is affected by a Zeeman magnetic field $H_{\text{Z}}$ and temperature $T$. In the neighborhood of a zero temperature first order critical point separating a nodal from a nodeless phase, the phase boundary at low $H_{\text{Z}}$ and/or low $T$ has a universal line shape cubic in $H_{\text{Z}}$ or $T$, such that the nodal state is stabilized at the expense of the nodeless. We calculate this line shape for a model of competing s_\pm-wave and d-wave pairing in iron-based superconductors.
- Publication:
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arXiv e-prints
- Pub Date:
- April 2017
- DOI:
- arXiv:
- arXiv:1704.05525
- Bibcode:
- 2017arXiv170405525F
- Keywords:
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- Condensed Matter - Superconductivity