Highly anisotropic superconducting gap near the nematic quantum critical point of FeSe1-xSx
Pranab Kumar Nag, Kirsty Scott, Vanuildo S. de Carvalho, Journey K. Byland, Xinze Yang, Morgan Walker, Aaron G. Greenberg, Peter Klavins, Eduardo Miranda, Adrian Gozar, Valentin Taufour, Rafael M. Fernandes, Eduardo H. da Silva Neto
ARTIGO
Inglês
Agradecimentos: We thank A. Chubukov, L. Glazman and P. Sukhachov for fruitful discussions during the preparation of this manuscript. E.H.d.S.N. acknowledges support from the National Science Foundation under grant number DMR-2034345. This work was supported by the Alfred P. Sloan Fellowship...
Ver mais
Agradecimentos: We thank A. Chubukov, L. Glazman and P. Sukhachov for fruitful discussions during the preparation of this manuscript. E.H.d.S.N. acknowledges support from the National Science Foundation under grant number DMR-2034345. This work was supported by the Alfred P. Sloan Fellowship (E.H.d.S.N.). Sample synthesis was supported by the UC Lab Fees Research Program (grant number LFR-20-653926). R.M.F. was supported by the US Department of Energy, Office of Science, Basic Energy Sciences, Materials Science and Engineering Division, under award number DE-SC0020045 (theory work). E.M. acknowledges support from CNPq-Brazil under grant number 309584/2021-3 and Fapesp under grant number 2022/15453-0
Ver menos
Abstract: Nematic phases, in which electrons in a solid spontaneously break rotational symmetry while preserving translational symmetry, exist in several families of unconventional superconductors. Superconductivity mediated by nematic fluctuations is well established theoretically, but it has yet...
Ver mais
Abstract: Nematic phases, in which electrons in a solid spontaneously break rotational symmetry while preserving translational symmetry, exist in several families of unconventional superconductors. Superconductivity mediated by nematic fluctuations is well established theoretically, but it has yet to be unambiguously identified experimentally. One major challenge is that nematicity is often intertwined with other degrees of freedom, such as magnetism and charge order. The FeSe1-xSx family of superconductors provides an opportunity to explore this concept, as it features an isolated nematic phase that can be suppressed by sulfur substitution at a quantum critical point where the nematic fluctuations are the largest. Here we determine the momentum structure of the superconducting gap near the centre of the Brillouin zone in FeSe0.81S0.19-close to the quantum critical point-and find that it is anisotropic and nearly nodal. The gap minima occur in a direction that is rotated 45 degrees with respect to the Fe-Fe direction, unlike the usual isotropic gaps due to spin-mediated pairing in other tetragonal Fe-based superconductors. Instead, we find that the gap structure agrees with theoretical predictions for superconductivity mediated by nematic fluctuations, indicating a change in the pairing mechanism across the phase diagram of FeSe1-xSx
Ver menos
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ
309584/2021-3
FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP
2022/15453-0
Fechado
Nag, Pranab Kumar
Autor
Scott, Kirsty
Autor
Highly anisotropic superconducting gap near the nematic quantum critical point of FeSe1-xSx
Pranab Kumar Nag, Kirsty Scott, Vanuildo S. de Carvalho, Journey K. Byland, Xinze Yang, Morgan Walker, Aaron G. Greenberg, Peter Klavins, Eduardo Miranda, Adrian Gozar, Valentin Taufour, Rafael M. Fernandes, Eduardo H. da Silva Neto
Highly anisotropic superconducting gap near the nematic quantum critical point of FeSe1-xSx
Pranab Kumar Nag, Kirsty Scott, Vanuildo S. de Carvalho, Journey K. Byland, Xinze Yang, Morgan Walker, Aaron G. Greenberg, Peter Klavins, Eduardo Miranda, Adrian Gozar, Valentin Taufour, Rafael M. Fernandes, Eduardo H. da Silva Neto
Fontes
|
Nature physics v. 21, n. 1, p. 89-96, Jan. 2025 |