期刊
PHYSICAL REVIEW LETTERS
卷 124, 期 10, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.124.107001
关键词
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资金
- Japan Society for the Promotion of Science [15H02106, 15H03688, 15KK0160, 18H01177, 18H05227, 19H00649, 15H05852, 19H05824]
- Deutsche Forschungsgemeinschaft (DFG) through the Wurzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter ct.qmat [EXC 2147, 39085490]
- ANR-DFG Grant Fermi-NESt
- Netherlands Organisation for Scientific Research (NWO) [16METL01]
- NUST MISiS Grant from the Ministry of Science and Higher Education of the Russian Federation [K2-2017-085]
- High Field Magnet Laboratory (HFML) at Radboud University (RU)
- Hochfeld-Magnetlabor Dresden (HLD) at Helmholtz-Zentrum Dresden-Rossendorf (HZDR), members of the European Magnetic Field Laboratory (EMFL)
- EPSRC [EP/N01085X/1] Funding Source: UKRI
- Grants-in-Aid for Scientific Research [19H00649, 15KK0160, 18H05227, 18H01177, 15H03688, 15H02106] Funding Source: KAKEN
We present resistivity and thermal-conductivity measurements of superconducting FeSe in intense magnetic fields up to 35 Tapplied parallel to the ab plane. At lowtemperatures, the upper critical field mu H-0(c2)ab shows an anomalous upturn, while thermal conductivity exhibits a discontinuous jump at mu H-0* approximate to 24 T well below mu H-0(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.
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