Библиографическое описание:Details of the disorder-induced transition between s(+/-) and s(++) states in the two-band model for Fe-based superconductors : сборник научных трудов / V. A. Shestakov [et al.]. - Текст : непосредственный // Supercond. Sci. Technol. - 2018. - Vol. 31, Is. 3. - P. 34001. - Cited Reference Count: 62. - Гранты: We are grateful to P D Grigor'ev and M V Sadovskii for useful discussions. This work was supported in part by the Russian Foundation for Basic Research (grant 16-02-00098) and Government Support of the Leading Scientific Schools of the Russian Federation (NSh-7559.2016.2). MMK and VAS acknowledge the support of the 'BASIS' Foundation for Development of Theoretical Physics and Mathematics. - Финансирующая организация: Russian Foundation for Basic Research [16-02-00098]; Government Support of the Leading Scientific Schools of the Russian Federation [NSh-7559.2016.2]; 'BASIS' Foundation for Development of Theoretical Physics and Mathematics. - MAR. - ISSN 0953-2048. - ISSN 1361-6668, DOI 10.1088/1361-6668/aaa501.
Аннотация:Irradiation of superconductors with different particles is one of many ways to investigate the effects of disorder. Here we study the disorder-induced transition between s(+/-) and s(++) states in the two-band model for Fe-based superconductors with nonmagnetic impurities. Specifically, we investigate the important question of whether the superconducting gaps during the transition change smoothly or abruptly. We show that the behavior can be of either type and is controlled by the ratio of intraband to interband impurity scattering potentials, and by a parameter sigma, that represents scattering strength and ranges from zero (Born approximation) to one (unitary limit). For the pure interband scattering potential and the scattering strength sigma less than or similar to 0.11, the s(+/-) -> s(++) transition is accompanied by steep changes in the gaps, while for larger values of s, the gaps change smoothly. The behavior of the gaps is characterized by steep changes at low temperatures, T
