تقرير
Evidence for an FFLO state with segmented vortices in the BCS-BEC-crossover superconductor FeSe
| العنوان: | Evidence for an FFLO state with segmented vortices in the BCS-BEC-crossover superconductor FeSe |
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| المؤلفون: | Kasahara, S., Sato, Y., Licciardello, S., Čulo, M., Arsenijević, S., Ottenbros, T., Tominaga, T., Böker, J., Eremin, I., Shibauchi, T., Wosnitza, J., Hussey, N. E., Matsuda, Y. |
| المصدر: | Phys. Rev. Lett. 124, 107001 (2020) |
| سنة النشر: | 2019 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Superconductivity, Condensed Matter - Quantum Gases, Condensed Matter - Strongly Correlated Electrons |
| الوصف: | We present resistivity and thermal-conductivity measurements of superconducting FeSe in intense magnetic fields up to 35 T applied parallel to the $ab$ plane. At low temperatures, the upper critical field $\mu_0 H_{c2}^{ab}$ shows an anomalous upturn, while thermal conductivity exhibits a discontinuous jump at $\mu_0 H^{\ast}\approx 24$ T well below $\mu_0 H_{c2}^{ab}$, indicating a first-order phase transition in the superconducting state. This demonstrates the emergence of a distinct field-induced superconducting phase. Moreover, the broad resistive transition at high temperatures abruptly becomes sharp upon entering the high-field phase, indicating a dramatic change of the magnetic-flux properties. We attribute the high-field phase to the Fulde-Ferrel-Larkin-Ovchinnikov (FFLO) state, where the formation of planar nodes gives rise to a segmentation of the flux-line lattice. We point out that strongly orbital-dependent pairing as well as spin-orbit interactions, the multiband nature, and the extremely small Fermi energy are important for the formation of the FFLO state in FeSe. Comment: 6 pages, 4 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevLett.124.107001 |
| URL الوصول: | http://arxiv.org/abs/1911.08237 |
| رقم الأكسشن: | edsarx.1911.08237 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevLett.124.107001 |
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