FeSe is an intriguing iron-based superconductor. It presents an unusual nematic state without magnetism and can be tuned to increase the critical superconducting temperature. Recently it has been observed a noteworthy anisotropy of the superconducting gaps. Its explanation is intimately related to the understanding of the nematic transition itself. Here, we show that the spin-nematic scenario driven by orbital-selective spin fluctuations provides a simple scheme to understand both phenomena. The pairing mediated by anisotropic spin modes is not only orbital selective but also nematic, leading to stronger pair scattering across the hole and X electron pocket. The delicate balance between orbital ordering and nematic pairing points also to a marked k z dependence of the hole–gap anisotropy.

Nematic pairing from orbital-selective spin fluctuations in FeSe / Benfatto, L.; Valenzuela, B.; Fanfarillo, L.. - In: NPJ QUANTUM MATERIALS. - ISSN 2397-4648. - 3:1(2018), pp. 1-7. [10.1038/s41535-018-0129-9]

Nematic pairing from orbital-selective spin fluctuations in FeSe

Fanfarillo L.
2018

Abstract

FeSe is an intriguing iron-based superconductor. It presents an unusual nematic state without magnetism and can be tuned to increase the critical superconducting temperature. Recently it has been observed a noteworthy anisotropy of the superconducting gaps. Its explanation is intimately related to the understanding of the nematic transition itself. Here, we show that the spin-nematic scenario driven by orbital-selective spin fluctuations provides a simple scheme to understand both phenomena. The pairing mediated by anisotropic spin modes is not only orbital selective but also nematic, leading to stronger pair scattering across the hole and X electron pocket. The delicate balance between orbital ordering and nematic pairing points also to a marked k z dependence of the hole–gap anisotropy.
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https://doi.org/10.1038/s41535-018-0129-9
Benfatto, L.; Valenzuela, B.; Fanfarillo, L.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.11767/98551
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