Josephson systems based on ballistic point contacts between single-band and multi-band superconductors

Yerin, Yuriy; Kiyko, А. S.; Omelyanchouk, A. N.; Il’ichev, E.

doi:10.1063/1.4935255

Cited by 13 publications

(6 citation statements)

References 38 publications

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“…For a dc SQUID formed by the Josephson microcontacts between a single-band and multi-band (two-or three-band) superconductors with ballistic conductivity, the specific features of the system are preserved, differing only quantitatively. 114…”

Section: Quantum Interferometers Based On Multiband Superconductorsmentioning

confidence: 99%

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Proximity and Josephson effects in microstructures based on multiband superconductors (Review Article)

Yerin

Omelyanchouk

2017

Low Temperature Physics

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Emerging in the 1950s, the multiband superconductivity has been considered for a long time as an approximate model in the form of a generalization of the BCS theory to the case of two bands for a more accurate quantitative description of the properties and characteristics of such superconductors as cuprates, heavy fermions compounds, metal boron carbides, fullerides, strontium ruthenate etc. due to their complex piecewise-continuous Fermi surfaces. However the discovery of the multiband structure of the superconducting state in magnesium diboride in 2001 and iron oxypnictides and chalcogenides in 2008 led to the appearance of many papers in which effects and different dependences well known for conventional single-band s-wave superconductors were reexamined. The main purpose of these studies was to reveal the symmetry type of the order parameter, which provides an important information about the mechanism of Cooper pairing in these superconductors. One of the most effective methods of obtaining information on the symmetry properties of the order parameter in the multiband superconductors is phase-sensitive techniques. This review summarizes the results of theoretical and experimental studies of the proximity and Josephson effects in systems based on multiband superconductors in contact with normal metals, insulators and other superconductors.

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Section: Quantum Interferometers Based On Multiband Superconductorsmentioning

confidence: 99%

“…Schematic representation of an ScS microcontact between a singleband and multi-band (three-band) superconductor with time-reversal symmetry breaking. The arrows correspond to the phases of the order parameters in each of the superconducting banks 114.…”

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confidence: 99%

Proximity and Josephson effects in microstructures based on multiband superconductors (Review Article)

Yerin

Omelyanchouk

2017

Low Temperature Physics

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“…Their emergence is the result of the contribution of the interband impurities, whose strength is characterized by the interband scattering rate Γ, being proportional to the impurity concentration. In the literature the term with the coefficient a 12 is sometimes referred to as the Josephson-like interaction [12]. Analogously, the term with the coefficient k 12 can be called the Andreev-Bashkin-like drag, since the structure of this term is similar to the current-current coupling in the Andreev-Bashkin effect [35].…”

Section: Model and Formalismmentioning

confidence: 99%

“…The presence of non-zero phase shifts raises a reasonable question, namely how are these topics they manifested or could become visible in the observables? At this stage, it has already been theoretically established that the occurrence of such phase difference topics should affect the Josephson effect with the appearance of ϕ (ϕ 0 ) and π junctions and the corresponding current-phase relations [8][9][10][11][12][13][14][15][16], phase-sensitive structures like dc-SQUID with the unusual Fraunhofer diffraction patterns [17], the Little-Parks effect with the nonparabolic dependence of the critical temperature shift [18] and current states with anomalous characteristics of depairing curves [19]. Moreover, under certain circumstances an applied magnetic flux can drive the phase shift, converting a state with chiral s ± + is ++ symmetry into a s ± configuration, when the intercomponent phase difference is stable and equal to π, and vice versa [20].…”

Section: Introductionmentioning

confidence: 99%

Multiple-q current states in a multicomponent superconducting channel

Yerin,

Drechsler,

Cuoco

et al. 2023

J. Phys.: Condens. Matter

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It is well-established that multicomponent superconductors can host different nonstandard phenomena such as broken-time reversal symmetry (BTRS) states, exotic Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phases, the fractional Josephson effect as well as plenty of topological defects like phase solitons, domain walls and unusual vortex structures. We show that in the case of a two-component superconducting quasi-one-dimensional channel this catalogue can be extended by a novel inhomogeneous current state, which we have termed as a multiple-momenta state or, in short, a multiple-q state, characterized by the coexistence of two different interpenetrating Cooper pair condensates with different total momenta. Within the Ginzburg-Landau formalism for a dirty two-band superconductor with sizable impurity scattering treated in the Born-approximation we reveal that under certain conditions, the occurrence of multiple-q states can induce a cascade of transitions involving switching between them and the homogeneous BTRS (non-BTRS) states and vice versa leading this way to a complex interplay of homogeneous and inhomogeneous current states. We find that hallmarks of such a multiple-q state within a thin wire or channel can be a saw-like dependence of the depairing current and the existence of two distinct stable branches on it (a bistable current state).

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“…The presence of non-zero phase shifts raises a reasonable question, namely how are these topics they manifested or could they become visible in the observables? At this stage, it has already been theoretically established that the occurrence of such phase difference topics should affect the Josephson effect with the appearance of φ (φ 0 ) and π junctions and the corresponding current-phase relations [8][9][10][11][12][13][14][15][16][17], phase-sensitive structures like dc-SQUID with the unusual Fraunhofer diffraction patterns [18], the Little-Parks effect with the non-parabolic dependence of the critical temperature shift [19,20] and current states with anomalous characteristics of depairing curves [21]. Moreover, under certain circumstances an applied magnetic flux can drive the phase shift, converting a state with chiral s ± + is ++ symmetry into a s ± configuration, when the intercomponent phase difference is stable and equal to π, and vice versa [22].…”

Section: Introductionmentioning

confidence: 99%

Multiple-q current states in a multicomponent superconducting channel

Yerin¹,

Drechsler²,

Cuoco³

et al. 2023

Preprint

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It is well-established that multicomponent superconductors can host different nonstandard phenomena such as broken-time reversal symmetry (BTRS) states, exotic Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phases, the fractional Josephson effect as well as plenty of topological defects like phase solitons, domain walls and unusual vortex structures. We show that in the case of a two-component superconducting quasi-one-dimensional channel this catalogue can be extended by a novel inhomogeneous current state, which we have termed as a multiple-momenta state or, in short, a multiple-q state, characterized by the coexistence of two different interpenetrating Cooper pair condensates with different total momenta. Within the Ginzburg-Landau formalism for a dirty twoband superconductor with sizable impurity scattering treated in the Born-approximation we reveal that under certain conditions, the occurrence of multiple-q states can induce a cascade of transitions involving switching between them and the homogeneous BTRS (non-BTRS) states and vice versa leading this way to a complex interplay of homogeneous and inhomogeneous current states. We find that hallmarks of such a multiple-q state within a thin wire or channel can be a saw-like dependence of the depairing current and the existence of two distinct stable branches on it (a bistable current state).

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Josephson systems based on ballistic point contacts between single-band and multi-band superconductors

Cited by 13 publications

References 38 publications

Proximity and Josephson effects in microstructures based on multiband superconductors (Review Article)

Proximity and Josephson effects in microstructures based on multiband superconductors (Review Article)

Multiple-q current states in a multicomponent superconducting channel

Multiple-q current states in a multicomponent superconducting channel

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