Journal
NEW JOURNAL OF PHYSICS
Volume 17, Issue -, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/17/7/073027
Keywords
superconductivity; FeSe; phonons structure; nematic; monolayer; SrTiO3; electron-phonon coupling
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Funding
- Theory Program at the Lawrence Berkeley National Lab through the Office of Basic Energy Sciences, US Department of Energy [DE-AC02-05CH11231]
- National Science Foundation [DMR10-1006184]
- Office of Science of the US Department of Energy
- Direct For Mathematical & Physical Scien [1006184] Funding Source: National Science Foundation
- Division Of Materials Research [1006184] Funding Source: National Science Foundation
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We show that electron-phonon coupling can induce strong electron pairing in an FeSe monolayer on a SrTiO3 substrate (experimental indications for superconducting T-c are between 65 and 109 K). The role of the SrTiO3 substrate in increasing the coupling is two-fold. First, the interaction of the FeSe and TiO2 terminated face of SrTiO3 prevents the FeSe monolayer from undergoing a shear-type (orthorhombic, nematic) structural phase transition. Second, the substrate allows an anti-ferromagnetic ground state of FeSe which opens electron-phonon coupling channels within the monolayer that are prevented by symmetry in the non-magnetic phase. The spectral function for the electron-phonon coupling (alpha F-2) in our calculations agrees well with inelastic tunneling data.
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