Vortex structure in superconductors with a many-component order parameter

Izyumov, Yu. A.; Laptev, V. M.

doi:10.1080/01411599008206870

Cited by 38 publications

(30 citation statements)

References 3 publications

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“…It is similar to the chiral domain structure of the triplet superconductors [31][32][33][34] or the texture in twocomponent Bose-Einstein condensates [35]. In this situation, the system enters into an ultimate quantum disorder phase.…”

Section: Discussionmentioning

confidence: 85%

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Disappearance of Meissner Effect and Specific Heat Jump in a Multiband Superconductor, Ba0.2K0.8Fe2As2

Tanaka

Shirage

Iyo

2009

J Supercond Nov Magn

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We observed the disappearance of the Meissner effect and the specific heat jump in Ba 0.2 K 0.8 Fe 2 As 2 . A crossover of the type of superconducting order parameter can be a source of these phenomena. A quantum phase disorder provides a possible explanation.Keywords Two-band superconductor · Two-component superconductor · Two-component quantum condensation · Soliton · i-soliton · Meissner effect · Specific heat · Fe-based superconductor · SU(2) superconductivity 1 Introduction

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Section: Discussionmentioning

confidence: 85%

“…This disorder is easily triggered by an inhomogeneity of the local crystal structures. Moreover, this domain wall can trap many fractional vortices [31,32].…”

Section: Discussionmentioning

confidence: 99%

Disappearance of Meissner Effect and Specific Heat Jump in a Multiband Superconductor, Ba0.2K0.8Fe2As2

Tanaka

Shirage

Iyo

2009

J Supercond Nov Magn

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“…However, in a special environment they can exist, i.e. , on a domain wall that preexists in the superconductor (Sigrist, Rice, and Ueda, 1989;Izyumov and Laptev, 1990).…”

Section: Fractionally Quantized Vorticesmentioning

confidence: 99%

Phenomenological theory of unconventional superconductivity

1991

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This article is a review of recent developments in the phenomenological description of unconventional superconductivity.Starting with the BCS theory of superconductivity with anisotropic Cooper pairing, the authors explain the group-theoretical derivation of the generalized Ginzburg-Landau theory for unconventional superconductivity. This is used to classify the possible superconducting states in a system with given crystal symmetry, including strong-coupling effects and spin-orbit interaction. On the basis of the BCS theory the unusual low-temperature properties and the (resonant) impurity scattering effects are discussed for superconductors with anisotropic pairing. Using the Ginzburg-Landau theory, the authors study several bulk properties of such superconductors: spontaneous lattice distortion, upper critical magnetic field, splitting of a phase transition due to uniaxial stress. Two possible mechanisms for ultrasound absorption are discussed: collective modes and damping by domain-wall motion. The boundary conditions for the Ginzburg-Landau theory are derived from a correlation function formulation and by grouptheoretical methods. They are applied to a study of the Josephson and proximity effects if unconventional superconductors are involved there. The magnetic properties of superconductors that break time-reversal symmetry are analyzed. Examples of current and magnetic-field distributions close to inhomogeneities of the superconducting order parameter are given and their physical origin is discussed. Vortices in a superconductor with a multicomponent order parameter can exhibit various topo1ogical structures. As examples the authors show fractional vortices on domain walls and nonaxial vortices in the bulk. Furthermore, the problem of the possible coexistence of a superconducting and a magnetically ordered phase in an unconventional superconductor is analyzed. The combination of two order parameters that are almost degenerate in their critical temperature is considered with respect to the phase-transition behavior and effects on the lower and upper critical fields. Because heavy-fermion superconductors -which are possible realizations of unconventional superconductivity -have been the main motivation for the phenomenological studies presented here, the authors compare the theoretical results with the experimental facts and data. In particular, they emphasize the intriguing features of the compound UPt3 and consider in detail the alloy U& Th Be/3.

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“…The existence of fractionally quantized flux vortices is very significant and attractive. The fluctuation of phase-difference mode leads to half-quantum flux vortices in two-gap superconductors [13][14][15]. A generalization to a three-gap superconductor results in very attractive features, that is, chiral states with time-reversal symmetry breaking and the existence of fractionally quantized 1 vortices [16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Gauge Fields, Massless Modes and Topology of Gauge Fields in Multi-Band Superconductors

Yanagisawa¹,

Tanaka²,

Hase³

2014

Proceedings of the 12th Asia Pacific Physics Conference (APPC12)

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Multi-phase physics is a new physics of multi-gap superconductors. Multi-band superconductors exhibit many interesting and novel properties. We investigate the dynamics of the phase-difference mode and show that this mode yields a new excitation mode. The phasedifference mode is represented as an abelian vector field. The fluctuation of phase-difference modes with non-trivial topology leads to the existence of a fractional-quantum flux vortex in a magnetic field. A superconductor with a fractional-quantum flux vortex is regarded as a topological superconductor with the integer Chern number.

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Vortex structure in superconductors with a many-component order parameter

Cited by 38 publications

References 3 publications

Disappearance of Meissner Effect and Specific Heat Jump in a Multiband Superconductor, Ba0.2K0.8Fe2As2

Disappearance of Meissner Effect and Specific Heat Jump in a Multiband Superconductor, Ba0.2K0.8Fe2As2

Phenomenological theory of unconventional superconductivity

Gauge Fields, Massless Modes and Topology of Gauge Fields in Multi-Band Superconductors

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