Chiral Ground State in Three-Band Superconductors

Tanaka, Y.; Yanagisawa, Takashi

doi:10.1143/jpsj.79.114706

Cited by 75 publications

(87 citation statements)

References 18 publications

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“…A recent theoretical proposal suggests that the system can resolve the frustration by a pairing state with s + id pairing symmetry which spontaneously breaks time-reversal (TR) symmetry [6]. The possibility of a TR-symmetry breaking pairing state due to frustrating pairing interactions among three or more Fermi pockets has also been investigated in several other contexts [7][8][9][10][11][12][13]. In general, time reversal breaking pairing states have rather accessible experimental signatures, and several proposals have been suggested in the context of iron based SC [6].…”

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confidence: 99%

Mechanism for a pairing state with time-reversal symmetry breaking in iron-based superconductors

et al. 2012

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The multipocket Fermi surfaces of iron-based superconductors promote pairing states with both s±-wave and d x 2 −y 2 -wave symmetry. We argue that the competition between these two order parameters could lead to a time-reversal-symmetry breaking state with s + id-pairing symmetry in the iron-based superconductors, and propose serveral scenarios in which this phase may be found. To understand the emergence of such a pairing state on a more rigorous footing, we start from a microscopic 5-orbital description representative for the pnictides. Using a combined approach of functional renormalization group and mean-field analysis, we identify the microscopic parameters of the s + id-pairing state. There, we find the most promising region for s + id-pairing in the electron doped regime with an enhanced pnictogen height.

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confidence: 99%

Mechanism for a pairing state with time-reversal symmetry breaking in iron-based superconductors

et al. 2012

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“…Taking into account the change of variables (26) and (27) Eqs. (19) and (20) (26) and (27) we can find the Sstates of a dc SQUID based on the Josephson junctions between two single-band superconductors ( fig. 11a), a single-band and a two-band s ± -wave superconductor ( fig.…”

Section: Behaviour Of a DC Squid Based On Josephson Point Contacts Bementioning

confidence: 99%

“…In this regard, there appeared models based on the assumption of a multi-component chiral structure of the order parameter with the symmetry of the with the symmetry of types s+id [15], s ± +is ++ [16], or with conventional s-wave symmetry with three or more gaps. Under certain conditions, the presence of chirality leads to the appearance of frustration, when the time-reversal symmetry in a superconductor is broken [17][18][19][20][21][22][23][24][25][26]. This means that the phases of the order parameter cannot simultaneously satisfy the minimum energy condition, hence creating a two or more fold degenerate ground state.…”

Section: Introductionmentioning

confidence: 99%

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

Yerin

Kiyko

Omelyanchouk

et al. 2015

Low Temperature Physics

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The Josephson effect in ballistic point contacts between single-band and multi-band superconductors was investigated. It was found that in the case of Josephson junctions formed by a single-band and an s ± -wave two-band superconductor as well as by a single-band and a three-band superconductor the junctions become frustrated, demonstrating the φ-contact properties. Depending on the ground state of a three-band superconductor with broken time-reversal symmetry (BTRS), the Josephson junction can have from one to three energy minima, some of which can be locally stable. We also study the behavior of a dc SQUID based on the Josephson junctions between singleband and multi-band superconductors. Some features on the dependences of the critical current and the total magnetic flux on the applied flux of a dc SQUID based on the Josephson point contacts between a single-band superconductor and an s ± -wave superconductor, three-band superconductor with BTRS and three-band superconductor without BTRS as compared to the conventional dc SQUIDs based on single-band superconductors were found. The results can be used as an experimental tool to detect the existence of multi-band structure and BTRS.

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“…In a two-band superconductor, two order parameters have the same and opposite phases for the attractive and repulsive coupling respectively. When there are three or more bands with interband repulsions, it is interesting that a frustrated state where phase differences among order parameters are neither 0 nor π appears, where time-reversal symmetry (TRS) is broken [6][7][8][9][10][11][12][13][14][15][16] , leading to interesting phase sensitive phenomena such as massless Leggett mode 17 and asymmetric critical current 18 .…”

Section: Introductionmentioning

confidence: 99%

Vortices with Fractional Flux Quanta in Multi-Band Superconductors

Huang¹,

Hu²

2015

J Supercond Nov Magn

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In superconductors with three or more components, time-reversal symmetry may be broken when the intercomponent couplings are repulsive, leading to a superconducting state with two-fold degeneracy. When prepared carefully there is a stable domain wall on a constriction which connects two bulks in states with opposite chiralities. Applying on external magnetic field, vortices in different components dissociate with each other, resulting in a ribbon shape distribution of magnetic field at the position of domain wall.

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Chiral Ground State in Three-Band Superconductors

Cited by 75 publications

References 18 publications

Mechanism for a pairing state with time-reversal symmetry breaking in iron-based superconductors

Mechanism for a pairing state with time-reversal symmetry breaking in iron-based superconductors

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

Vortices with Fractional Flux Quanta in Multi-Band Superconductors

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