Exploring the relationship between the magnetic frustration and the emergence of FFLO state on a triangular lattice |
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Authors: | Jia Guo Hong-Min Jiang Jian-Xin Li |
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Institution: | 1. National Laboratory of Solid State of Microstructure and Department of Physics, Nanjing University, Nanjing 210093, China;2. Department of Physics, Hangzhou Normal University, Hangzhou 310036, China |
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Abstract: | The Fulde–Ferrell–Larkin–Ovchinnikov (FFLO) unconventional superconductors attract renewed interest in recent years. However, an unambiguous experimental demonstration of the FFLO state is hindered by the stringent requirements for its realization. In this paper, we explore the relationship between the magnetic frustration and the emergence of the FFLO state on an anisotropic triangular lattice, based on the self-consistent calculation of the Bogoliubov-de Gennes equations. We find that the required lower critical magnetic field to enter the FFLO state decreases with the increase of both the anisotropic ratio and the on-site Coulomb repulsive interaction. This demonstrates that it is easier to enter the FFLO state on the structurally frustrated triangular lattice in comparison with the square lattice, and suggests that the layered organic superconductors with a triangular lattice may be good candidates for exploring the FFLO state. |
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