Calorimetric evidence of nodal gaps in the nematic superconductor FeSe
Superconductivity in FeSe has recently attracted a great deal of attention because it emerges out of an electronic nematic state of elusive character. Here we study both the electronic normal state and the superconducting gap structure using heat-capacity measurements on high-quality single crystals...
Gespeichert in:
| Hauptverfasser: | , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
29 January 2019
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| In: |
Physical review
Year: 2019, Jahrgang: 99, Heft: 3 |
| ISSN: | 2469-9969 |
| DOI: | 10.1103/PhysRevB.99.035157 |
| Online-Zugang: | Verlag, Volltext: http://dx.doi.org/10.1103/PhysRevB.99.035157 Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevB.99.035157 
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| Verfasserangaben: | Frédéric Hardy, Mingquan He, Liran Wang, Thomas Wolf, Peter Schweiss, Michael Merz, Maik Barth, Peter Adelmann, Robert Eder, Amir-Abbas Haghighirad, and Christoph Meingast |
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| 520 | |a Superconductivity in FeSe has recently attracted a great deal of attention because it emerges out of an electronic nematic state of elusive character. Here we study both the electronic normal state and the superconducting gap structure using heat-capacity measurements on high-quality single crystals. The specific-heat curve, from 0.4 K to Tc=9.1K, is found to be consistent with a recent gap determination using Bogoliubov quasiparticle interference [P. O. Sprau et al., Science 357, 75 (2017)]; however, only if nodes are introduced on either the electron or the hole Fermi-surface sheets. Our analysis, which is consistent with quantum-oscillation measurements, relies on the presence of one hole and one electron band only, and thus the fate of the theoretically predicted second electron pocket remains mysterious. | ||
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