Journal
PHYSICAL REVIEW B
Volume 102, Issue 13, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.102.134503
Keywords
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Funding
- Ministry of Education, Culture, Sports, Science and Technology [JP19H05825, JP19K14654, JP18K03442, JP18H01158, JP16K17735, JP17K14336, JP20K14423, JP16H06345]
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We formulate an efficient scheme to perform a Migdal-Eliashberg calculation considering the retardation effect from first principles. While the conventional approach requires a huge number of Matsubara frequencies, we show that the intermediate representation of the Green's function [H. Shinaoka et al., Phys. Rev. B 96, 035147 (2017)] dramatically reduces the numerical cost to solve the linearized gap equation. Without introducing any empirical parameter, we obtain a superconducting transition temperature of elemental Nb (similar to 10 K), which is consistent with experiment. The present result indicates that our approach has a superior performance for many superconductors for which T-c is lower than O(10) K.
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