Crossover from thermal to quantum creep in layered antiferromagnetic superconductor

Abstract

The influence of the antiferromagnetic order on the superconductor in the mixed state results in creation of spin-flop domains along the cores of the vortex lines. It is shown that this phenomenon makes possible crossover from quantum creep regime to thermal one, and vice versa, at constant temperature. To do this one needs to simply change the intensity or the direction of applied magnetic field in the basal ab plane of layered structure.

Macroscopic Quantum Tunnelling of Josephson Vortex in Antiferromagnetic Superconductor

“…The effective mass and viscosity coefficient of the vortex were estimated in [6] 2 , where m e denotes the mass of the electron, F is the Fermi energy and κ -the Ginzburg-Landau parameter. One can easily see that the crossover temperature Eq.…”

“…The line tension ε 1 is different for vortices in two different orientations in the ab plane. Those vortices lying parallel to b direction and those ones lying in the a direction but created in the magnetic field less than 1 2 H T have the line tension ε b and those ones lying in the a direction but possessing SF domain and fields above 1 2 H T have the line tension denoted ε a [6].…”

Dynamics of the Magnetic Flux Peculiar to Antiferromagnetic Superconductors

“…The line tension ε 1 is different for vortices in two different orientations in the ab plane. Those vortices lying parallel to b direction and those ones lying in the a direction but created in the magnetic field less than 1 2 H T have the line tension ε b [1], and those ones lying in the a direction but possessing SF domain have the line tension ε a [8] …”

Two-step flux penetration in layered antiferromagnetic superconductor

“…Now, consider the vortex line as a straight string-like object of an effective mass m per unit length trapped into a metastable state in an intrinsic pinning potential V (u) and exposed to continuous deformation u(x, t) in theẑ direction. 41 The magnetic field is applied inx direction (a direction on Fig. 3).…”