Boundary conditions for the junction of a normal metal with multiband superconductors with unusual types of superconducting pairing

Burmistrova, A. V.; Devyatov, I. A.

doi:10.1134/s0021364012180026

Cited by 6 publications

(11 citation statements)

References 18 publications

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“…Here 3),( 5),( 14)) at both S/I and I/S p interfaces. The boundary conditions for the Green's functions in the tight-binding approximation can be found in a similar way as in 23,24 . Due to the translational invariance of the structure in the direction parallel to the interface, k y component of the momentum is conserved.…”

Section: Model For the Contact Between S-wave Superconductor And A Febsmentioning

confidence: 99%

“…Due to the necessity to take into account at least two orbitals for correct description of the FeBS band structure, two hopping parameters γ 1 and γ 2 should be introduced in orbital space which describe an interface between single-band and two-band materials (instead of single hopping parameter γ at the interface between two single-band materials 42 ). The introduction of these two parameters provides a possibility to match coherently wave functions (Green functions) at this boundary and to describe the processes of interband scaterring microscopically, as it was demonstrated in 23,24 For simplicity, we assume that the lattice constants in S, I and S p are equal. To calculate the Josephson current across S/I/S p junction we should construct Green's functions of the whole system.…”

Section: Model For the Contact Between S-wave Superconductor Andmentioning

confidence: 99%

“…(3) -(5) can be obtained from matching the Green's functions (3) -(5) at the S/I and I/S interfaces. The boundary conditions for multiorbital metals in tight-binding approximation have been proposed recently 23,24 . For temperature Green's functions, these boundary conditions in the quasiclassical approximation at S/I boundary have the form:…”

Section: A Model Of S/i/s Josephson Junctionmentioning

confidence: 99%

“…Several phenomenological theories of transport in junctions based on FeBS have been proposed in the past [16][17][18][19][20][21][22] . However, only recently a microscopic theory of the quasiparticle current in normal metal -multiband superconductor junctions was formulated 23,24 , which takes into account unusual properties of these materials. But there is still no microscopic theory to describe the Josephson current in junctions between multiband superconductor and conventional single-band spin-singlet s-wave superconductor, which goes beyond the existing phenomenological theories 18,[25][26][27] .…”

Section: Introductionmentioning

confidence: 99%

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Josephson current in Fe-based superconducting junctions: Theory and experiment

et al. 2015

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We present theory of dc Josephson effect in contacts between Fe-based and spin-singlet s-wave superconductors. The method is based on the calculation of temperature Green's function in the junction within the tight-binding model. We calculate the phase dependencies of the Josephson current for different orientations of the junction relative to the crystallographic axes of Fe-based superconductor. Further, we consider the dependence of the Josephson current on the thickness of an insulating layer and on temperature. Experimental data for PbIn/Ba1−xKx(FeAs)2 pointcontact Josephson junctions are consistent with theoretical predictions for s± symmetry of an order parameter in this material. The proposed method can be further applied to calculations of the dc Josephson current in contacts with other new unconventional multiorbital superconductors, such as Sr2RuO4 and superconducting topological insulator CuxBi2Se3.

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Section: Model For the Contact Between S-wave Superconductor And A Febsmentioning

confidence: 99%

Section: Model For the Contact Between S-wave Superconductor Andmentioning

confidence: 99%

Section: A Model Of S/i/s Josephson Junctionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Josephson current in Fe-based superconducting junctions: Theory and experiment

et al. 2015

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“…of Eq. (61) 58,59 the BCs at an interface between different materials in a ballistic case were derived using another approach.…”

Section: Subgap Conductance In N/i Sf /S Junctions: Effective Boumentioning

confidence: 99%

Electronic transport through ferromagnetic and superconducting junctions with spin-filter tunneling barriers

2012

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We present a theoretical study of the quasiparticle and subgap conductance of generic X/I sf /S M junctions with a spin-filter barrier I sf , where X is either a normal N or a ferromagnetic metal F and S M is a superconductor with a built-in exchange field. Our study is based on the tunneling Hamiltonian and the Green's-function technique. First, we focus on the quasiparticle transport, both above and below the superconducting critical temperature. We obtain a general expression for the tunneling conductance which is valid for arbitrary values of the exchange field and arbitrary magnetization directions in the electrodes and in the spin-filter barrier. In the second part, we consider the subgap conductance of a N/I sf /S junction, where S is a conventional superconductor. In order to account for the spin-filter effect at interfaces, we heuristically derive boundary conditions for the quasiclassical Green's functions. With the help of these boundary conditions, we show that the proximity effect and the subgap conductance are suppressed by spin filtering in a N/I sf /S junction. Our work provides useful tools for the study of spin-polarized transport in hybrid structures both in the normal and in the superconducting state.

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Quasiclassical theory of coherent charge transport into multi-band superconductors

Burmistrova¹,

Devyatov²,

Golubov³

et al. 2013

Supercond. Sci. Technol.

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We formulate a quasiclassical theory of coherent charge transport in junctions involving multi-band iron-based superconductors (FeBSs), explicitly taking into account the complex excitation spectrum and unconventional nature of superconducting pairing in FeBSs. We perform calculations assuming intraorbital superconducting pairing in FeBSs described by the s ± model. Further, taking into account that the Fermi energy in FeBSs is much larger than the superconducting gaps, we formulate the quasiclassical approximation. This formulation makes our theory suitable for straightforward numerical calculations and more practical compared to previous approaches. Based on this quasiclassical theory, we calculated the conductance of a junction between a single band normal metal and an FeBS.

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Boundary conditions for the junction of a normal metal with multiband superconductors with unusual types of superconducting pairing

Cited by 6 publications

References 18 publications

Josephson current in Fe-based superconducting junctions: Theory and experiment

Josephson current in Fe-based superconducting junctions: Theory and experiment

Electronic transport through ferromagnetic and superconducting junctions with spin-filter tunneling barriers

Quasiclassical theory of coherent charge transport into multi-band superconductors

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