تقرير
Vortex-lattice melting and paramagnetic depairing in the nematic superconductor FeSe
| العنوان: | Vortex-lattice melting and paramagnetic depairing in the nematic superconductor FeSe |
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| المؤلفون: | Hardy, F., Doussoulin, L., Klein, T., He, M., Demuer, A., Willa, R., Willa, K., Haghighirad, A. -A., Wolf, T., Merz, M., Meingast, C., Marcenat, C. |
| المصدر: | Phys. Rev. Research 2, 033319 (2020) |
| سنة النشر: | 2020 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Superconductivity |
| الوصف: | The full H-T phase diagram in the nematic superconductor FeSe is mapped out using specific-heat and thermal-expansion measurements down to 0.7 K and up to 30 T for both field directions. A clear thermodynamic signal of an underlying vortex-melting transition is found in both datasets and could be followed down to low temperatures. The existence of significant Gaussian thermal superconducting fluctuations is demonstrated by a scaling analysis, which also yields the mean-field upper critical field Hc2(T). For both field orientations, Hc2(T) shows Pauli-limiting behavior. Whereas the temperature dependence of the vortex-melting line is well described by the model of Houghton et al., Phys. Rev. B 40, 6763 (1989) down to the lowest temperatures for H $\perp$ FeSe layers, the vortex-melting line exhibits an unusual behavior for fields parallel to the planes, where the Pauli limitation is much stronger. Here, the vortex-melting anomaly is only observed down to T*= 2-3 K, and then merges with the Hc2(T) line as predicted by Adachi and Ikeda, Phys. Rev. B 68 184510 (2003). Below T*, Hc2(T) also exhibits a slight upturn possibly related to the occurence of a Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state. Comment: 7 figures, 11 pages |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevResearch.2.033319 |
| URL الوصول: | http://arxiv.org/abs/2004.10848 |
| رقم الأكسشن: | edsarx.2004.10848 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevResearch.2.033319 |
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