Nematic resonance in the Raman response of iron-based superconductors
| Autor: | Gallais, Y., Paul, I., Chauviere, L., Schmalian, J. |
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| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Phys. Rev. Lett. 116, 017001 (2016) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.116.017001 |
| Popis: | In a fully-gapped superconductor the electronic Raman response has a pair-breaking peak at twice the superconducting gap $\Delta$, if the Bogoliubov excitations are uncorrelated. Motivated by the iron based superconductors, we study how this peak is modified if the superconducting phase hosts a nematic-structural quantum critical point. We show that, upon approaching this point by tuning, e.g., doping, the growth of nematic correlations between the quasiparticles transforms the pair-breaking peak into a nematic resonance. The mode energy is below 2$\Delta$, and stays finite at the quantum critical point, where its spectral weight is sharply enhanced. The latter is consistent with recent experiments on electron-doped iron based superconductors and provides direct evidence of nematic correlations in their superconducting phases. Comment: Phys. Rev. Lett. 116, 017001 (2016) |
| Databáze: | arXiv |
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