Coherent current states in a two-band superconductor

Yerin, Yuriy; Omelyanchouk, A. N.

doi:10.1063/1.2737547

Cited by 26 publications

(17 citation statements)

References 34 publications

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“…6 we also plot critical current j pl c which is found using the assumption that the transition to the resistive state occurs from the phaselocked state. 12 One can see that it coincides with our j c at relatively large γ when phase texture state practically disappears (phase texture state weakens the superconducting state in a way like it does the solition state) and j c < j pl c (excepting rather small γ). We also consider two-band bridge with normal leads.…”

Section: Case Of Finite Interband Couplingsupporting

confidence: 73%

Soliton-induced critical current oscillations in two-band superconducting bridges

Marychev

Vodolazov

2018

Phys. Rev. B

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Section: Case Of Finite Interband Couplingsupporting

confidence: 73%

Soliton-induced critical current oscillations in two-band superconducting bridges

Marychev

Vodolazov

2018

Phys. Rev. B

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“…where α is a constant (α = 1.74 in the weak coupling limit, i.e., in the BCS theory) [48]. The fitted values of α for the cases considered in this work are also collected in Table 1.…”

Section: The Temperature Dependence Of the Effective Superconducting mentioning

confidence: 99%

Effects of Pair-Hopping Coupling on Properties of Multi-Band Iron-Based Superconductors

2020

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A variety of superconducting materials exhibit multi-band behavior in a form of multicomponent Fermi surfaces. By using a two-band model with a pair hopping, we explain how the interband coupling affects the physical properties of multi-band superconductors. We determine the temperature dependence of the superconducting gap and the specific heat, which strongly diverge from the BCS-type behavior. The anisotropic gap for the system with the mixed gap symmetry is found. Additionally, the spectral function and density of states are significantly modified by the inter-orbital interactions. The results obtained for different symmetries of the order parameter are in a good agreement with the experimental findings for the iron-based superconductors and other multi-band systems.

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“…The sign of U 12 determines the symmetry of the order parameter in the clean case. A repulsive interband interaction constant U 12 < 0 leads to a ground state with π-phase difference between the two bands, while attractive interband interactions U 12 > 0 stabilize a ground state with a zero-phase difference between their gap functions 41 . The ground state of the two-band system is examined within a mean-field theory.…”

Section: Model and Basic Equationsmentioning

confidence: 99%

Coexistence of giant Cooper pairs with a bosonic condensate and anomalous behavior of energy gaps in the BCS-BEC crossover of a two-band superfluid Fermi gas

et al. 2019

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We investigate Bardeen-Cooper-Schrieffer (BCS) − Bose-Einstein condensation (BEC) crossover in a two-band superfluid Fermi gas with an energy shift between the bands. When the intraband coupling in the cold (first) band is fixed as weak, we find that in the case of vanishing interband interaction and in the strong-coupling limit of the hot (second) band the system undergoes a transition to a single-component configuration with the full suppression of the first energy gap and with the full redistribution of particles between bands. For non-vanishing interband interaction we reveal the non-monotonic dependence of the energy gap in the first band vs intraband coupling in the second band with the presence of a hump. In the case of weak interband coupling the system shows a significant amplification of the intrapair correlation length of the condensate in the first band in the strong-coupling regime of the second band, which clearly indicates the coexistence of giant Cooper pairs and a bosonic condensate even for nonzero temperatures. This can lead to a non-monotonic temperature dependence of the second energy gap with a peak. Here predicted coexistence of the giant Cooper pairs and bosonic molecules can be verified by means of the visualization of vortex cores in the two-component atomic condensates as well as in some iron-based superconductors.PACS numbers:

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Coherent current states in a two-band superconductor

Abstract: Homogeneous current states in thin films and Josephson current in superconducting microbridges are studied within the frame of a two-band Ginzburg-Landau theory. By solving the coupled system of equations for two order parameters the depairing current curves and

Cited by 26 publications

References 34 publications

Soliton-induced critical current oscillations in two-band superconducting bridges

Soliton-induced critical current oscillations in two-band superconducting bridges

Effects of Pair-Hopping Coupling on Properties of Multi-Band Iron-Based Superconductors

Coexistence of giant Cooper pairs with a bosonic condensate and anomalous behavior of energy gaps in the BCS-BEC crossover of a two-band superfluid Fermi gas

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