Vertex dominated superconductivity in intercalated FeSe

Acharya, Swagata; Katsnelson, Mikhail I.; van Schilfgaarde, Mark

doi:10.1038/s41535-023-00556-9

Title: Vertex dominated superconductivity in intercalated FeSe

Journal Article · 11 May 2023 · npj Quantum Materials

DOI: https://doi.org/10.1038/s41535-023-00556-9 · OSTI ID:1985613

^[1];

^[1]; van Schilfgaarde, Mark ^[2]

Radboud University, Nijmegen (Netherlands)
National Renewable Energy Laboratory (NREL), Golden, CO (United States); King's College, London (United Kingdom)

Bulk FeSe becomes superconducting below 9 K, but the critical temperature (T_c) is enhanced almost universally by a factor of ~4–5 when it is intercalated with alkali elements. How intercalation modifies the structure is known from in-situ X-ray and neutron scattering techniques, but why T_c changes so dramatically is not known. Here we show that there is one-to-one correspondence between the enhancement in magnetic instabilities at certain q vectors and superconducting pairing vertex, even while the nuclear spin relaxation rate 1/(T₁T) may not reflect this enhancement. Intercalation modifies electronic screening both in the plane and also between layers. We disentangle quantitatively how superconducting pairing vertex gains from each such changes in electronic screening. Intercalated FeSe provides an archetypal example of superconductivity where information derived from the single-particle electronic structure appears to be insufficient to account for the origins of superconductivity, even when they are computed including correlation effects. We show that the five-fold enhancement in T_c on intercalation is not sensitive to the exact position of the d_xy at Γ point, as long as it stays close to E_F. Finally, we show that intercalation also significantly softens the collective charge excitations, suggesting the electron-phonon interaction could play some role in intercalated FeSe.

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Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); SURF Cooperative; USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC36-08GO28308; AC02-05CH11231

OSTI ID:: 1985613

Report Number(s):: NREL/JA-5F00-84151; {UUID:a2b4e223-17f6-4008-b3d3-929ed527fc62,MainId:84924,MainAdminID:69715,"Journal ID: ISSN 2397-4648"}

Journal Information:: npj Quantum Materials, Journal Name: npj Quantum Materials Journal Issue: 1 Vol. 8; ISSN 2397-4648

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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superconductivity
vertex

Title: Vertex dominated superconductivity in intercalated FeSe

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