Superconducting states and magnetic hysteresis in finite superconductors

Zharkov, G. F.

doi:10.1070/pu2004v047n09abeh001875

Cited by 4 publications

(2 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For ellipsoids of rotation and cylinders, similar calculations are made in works [4,5]. It should be noted that there are other approaches currently used to describe the magnetic properties of finite-size superconductors, based on the stationary [6,7] and non-stationary [8] Ginzburg-Landau N.D. Kuzmichev, A.A. Shushpanov, M.A. Vasyutin equations.…”

Section: Introductionmentioning

confidence: 94%

“…In the present work, we present the calculation of magnetization loops, taking into account the equilibrium area on the basis of the methodology mentioned above. In contrast to the works [13][14][15][16][20][21][22], in which the calculation method is valid for samples with zero demagnetizing factor, the calculation of hysteresis loops of magnetic moment was performed according to the previously obtained distribution of the critical current density in the sample on the basis of equation (6). In this case, the demagnetizing field is taken into account without additional restrictions.…”

Section: Equilibrium Magnetization Accountingmentioning

confidence: 99%

See 1 more Smart Citation

Simulation of the features of the magnetic properties of axisummetric granules of hard type II superconductors

2022

View full text Add to dashboard Cite

Based on the equations of electrodynamics and the concept of a critical state for hard superconductors of the 2nd kind, numerical simulation of the magnetic properties of axisymmetric superconducting samples, in particular, granules, is performed for a number of models of the dependence of the critical current density on the magnetic field induction. The magnetic moment loops are calculated directly by integrating the integral equation for the current density over time. The phenomena of the peak effect and the asymmetry of the magnetization hysteresis loop are also considered using the indicated equation. Various versions of the functions used in the literature were used as peak functions. In addition to the hysteresis loop of the magnetic moment, the magnetic field induction at the center of axisymmetric samples, and the total penetration field, the profiles of the critical current density Jc(B) and the equilibrium magnetic moment for spherical granules were obtained. The method used for calculating the magnetic moment of superconductors makes it possible to take into account the equilibrium and nonequilibrium regions of the magnetization of the samples independently Keywords: magnetic moment, axisymmetric granules, type II superconductor, critical state, peak effect, equilibrium magnetic moment.

show abstract

Section: Introductionmentioning

confidence: 94%

Section: Equilibrium Magnetization Accountingmentioning

confidence: 99%

Simulation of the features of the magnetic properties of axisummetric granules of hard type II superconductors

2022

View full text Add to dashboard Cite

show abstract

Linear and nonlinear low-frequency electrodynamics of surface superconducting states in an yttrium hexaboride single crystal

et al. 2008

View full text Add to dashboard Cite

We report the low-frequency and tunneling studies of yttrium hexaboride single crystal. Ac susceptibility at frequencies 10 -1500 Hz has been measured in parallel to the crystal surface DC fields, H0. We found that in the DC field H0 > Hc2 DC magnetic moment completely disappears while the ac response exhibited the presence of superconductivity at the surface. Increasing of the DC field from Hc2 revealed the enlarging of losses with a maximum in the field between Hc2 and Hc3. Losses at the maximum were considerably larger than in the mixed and in the normal states. The value of the DC field, where loss peak was observed, depends on the amplitude and frequency of the ac field. Close to Tc this peak shifts below Hc2 which showed the coexistence of surface superconducting states and Abrikosov vortices. We observed a logarithmic frequency dependence of the in-phase component of the susceptibility. Such frequency dispersion of the inphase component resembles the response of spin-glass systems, but the out-of-phase component also exhibited frequency dispersion that is not a known feature of the classic spin-glass response. Analysis of the experimental data with Kramers-Kronig relations showed the possible existence of the loss peak at very low frequencies (< 5 Hz). We found that the amplitude of the third harmonic was not a cubic function of the ac amplitude even at considerably weak ac fields. This does not leave any room for treating the nonlinear effects on the basis of perturbation theory. We show that the conception of surface vortices or surface critical currents could not adequately describe the existing experimental data. Consideration of a model of slow relaxing nonequilibrium order parameter permits one to explain the partial shielding and losses of weak ac field for H0 > Hc2.

show abstract

Pinning of a Magnetic Flux in Polycrystalline YBa2Cu3O6.92 HTSC during Cooling in a Weak Magnetic Field

Trusevich,

Gavrilkin,

Trakhtenberg

2023

J. Exp. Theor. Phys.

View full text Add to dashboard Cite

Superconducting states and magnetic hysteresis in finite superconductors

Cited by 4 publications

References 23 publications

Simulation of the features of the magnetic properties of axisummetric granules of hard type II superconductors

Simulation of the features of the magnetic properties of axisummetric granules of hard type II superconductors

Linear and nonlinear low-frequency electrodynamics of surface superconducting states in an yttrium hexaboride single crystal

Pinning of a Magnetic Flux in Polycrystalline YBa2Cu3O6.92 HTSC during Cooling in a Weak Magnetic Field

Contact Info

Product

Resources

About