London penetration depth and coherence length of SU(3) vacuum flux tubes

Objectives. There is no general theory of superconductivity capable of fully describing this phenomenon, which imposes its own difficulties in the search for new superconducting materials, as well as in the study of their properties. In particular, the electrodynamics of a superconducting system is unexplored. With the aim of a possible further description of the electrodynamics of superconductors, the temperature dependences of the energy parameters of a Cooper pair in the potential field of Abrikosov vortex were analyzed.Methods. The basis for the obtained results of the work was the consideration of the transmission coefficient for a superconducting particle in the approximation of the Wentzel– Kramers–Brillouin method, as well as the relationship between the critical temperature and the London penetration depth and the coherence length based on the model of plasmon destruction of the superconducting state.Results. The dependences of the lifetime of a particle in a potential well, penetration depth, frequency of impacts of a particle against a potential barrier, blurring of the energy level, transmission coefficient, and potential and kinetic energy of a particle on temperature were obtained. The characteristic values of these parameters were obtained at absolute zero for various cuprate, organic, and other superconducting materials. The dependences of the critical electric potential on temperature, as well as the London penetration depth, coherence length, and electric potential on the transmission coefficient at different temperatures were obtained. The form of the dependences qualitatively corresponds to the experimental data.Conclusions. The results obtained can be used to construct a general theory of superconductivity, describe the electrodynamics of a superconducting state, and develop new superconductors with higher critical currents.

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Magnetic-field dependence of the London penetration depth in type-II superconductor V3Si

Physica C Superconductivity ◽

10.1016/0921-4534(95)00166-2 ◽

1995 ◽

Vol 246 (3-4) ◽

pp. 223-227 ◽

Cited By ~ 5

Author(s):

Tetsuo Hanaguri ◽

Yoichi Iino ◽

Atsutaka Maeda ◽

Tetsuo Fukase

Keyword(s):

Magnetic Field ◽

Penetration Depth ◽

Field Dependence ◽

Magnetic Field Dependence ◽

Type Ii ◽

London Penetration Depth ◽

Type Ii Superconductor

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Chromoelectric flux tubes and coherence length in QCD

Physical Review D ◽

10.1103/physrevd.86.054501 ◽

2012 ◽

Vol 86 (5) ◽

Cited By ~ 26

Author(s):

Paolo Cea ◽

Leonardo Cosmai ◽

Alessandro Papa

Keyword(s):

Coherence Length ◽

Flux Tubes

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London penetration depth in the ensemble of spin polarons of cuprate superconductors

The European Physical Journal B ◽

10.1140/epjb/e2018-90266-6 ◽

2018 ◽

Vol 91 (11) ◽

Cited By ~ 2

Author(s):

Dmitry M. Dzebisashvili ◽

Konstantin K. Komarov

Keyword(s):

Penetration Depth ◽

Cuprate Superconductors ◽

London Penetration Depth ◽

Spin Polarons

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Theoretical Study of Upper Critical Magnetic Field (HC2) in Multiband Iron Based Superconductors

Advances in Condensed Matter Physics ◽

10.1155/2016/5470429 ◽

2016 ◽

Vol 2016 ◽

pp. 1-10 ◽

Cited By ~ 1

Author(s):

Tsadik Kidanemariam ◽

Gebregziabher Kahsay

Keyword(s):

Magnetic Field ◽

Phase Diagrams ◽

Penetration Depth ◽

Coherence Length ◽

Symmetry Axis ◽

Critical Magnetic Field ◽

Ginzburg Landau ◽

Iron Based Superconductors ◽

Upper Critical Magnetic Field ◽

Iron Based

This research work focuses on the theoretical investigation of the upper critical magnetic field,HC2; Ginzburg-Landau coherence length,ξGL(T); and Ginzburg-Landau penetration depth,λGL(T), for the two-band iron based superconductorsBaFe2(As1-xPx)2,NdO1-xFxFeAs, and LiFeAs. By employing the phenomenological Ginzburg-Landau (GL) equation for the two-band superconductorsBaFe2(As1-xPx)2,NdO1-xFxFeAs, and LiFeAs, we obtained expressions for the upper critical magnetic field,HC2; GL coherence length,ξGL; and GL penetration depth,λGL, as a function of temperature and the angular dependency of upper critical magnetic field. By using the experimental values in the obtained expressions, phase diagrams of the upper critical magnetic field parallel,HC2∥c, and perpendicular,HC2⊥c, to the symmetry axis (c-direction) versus temperature are plotted. We also plotted the phase diagrams of the upper critical magnetic field,HC2versus the angleθ. Similarly, the phase diagrams of the GL coherence length,ξGL, and GL penetration depth,λGL, parallel and perpendicular to the symmetry axis versus temperature are drawn for the superconductors mentioned above. Our findings are in agreement with experimental observations.

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Superconductive Properties of CsxRbyC60 (33K) - Isotope Effect -

MRS Proceedings ◽

10.1557/proc-247-311 ◽

1992 ◽

Vol 247 ◽

Author(s):

T. W. Ebbesen ◽

K. Tanigaki ◽

S. Saito ◽

J. Mizuki ◽

J. S. Tsai ◽

...

Keyword(s):

Fermi Level ◽

Penetration Depth ◽

Isotope Effect ◽

Lattice Constant ◽

Density Of States ◽

Coherence Length ◽

The Other ◽

First Report ◽

Electron Coupling

ABSTRACTThe surprisingly high Tc for the superconductivity of alkali doped C60 has spurred wide interest in understanding its mechanism [1–7]. We first report the superconductive properties of CsxRbyC60 which has a Tc as high as 33 K when x=2 and y=1 in the feed [4, 5]. SQUID measurements show that in this material the coherence length is 45 A and the penetration depth about 1, 800 A [5]. It has now been proven that the observed increase in the Tc with the size of the alkali dopant is due to the increase in the lattice constant [6]. This is most likely due to the changes in the density of states at the Fermi level. The other important parameter according to BSC theory is the phonon which mediates the electron-electron coupling. In the second part of this paper we present recent results which show that the Tc is indeed strongly influenced by this parameter [7]. The isotope effect is unexpectedly strong on the Tc.

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