Prediction of polaron-like vortices and dissociation depinning transition in magnetic superconductors: The example of ErNi2B2C

Abstract

In borocarbide ErNi${}_2$B${}_2$C the phase transition to the commensurate spin density wave at 2.3 K leaves 1/20 part of Ising-like Er spins practically free. Vortices polarize these spins nonuniformly and repolarize them when moving. At a low spin relaxation rate and at low bias currents vortices carrying magnetic polarization clouds become polaron-like and their velocities are determined by the effective drag coefficient which is significantly bigger than the Bardeen-Stephen (BS) one. As current increases, at a critical current $J_c$ vortices release polarization clouds and the velocity as well as the voltage in the I-V characteristics jump to values corresponding to the BS drag coefficient. The nonuniform components of the magnetic field and magnetization drop as velocity increases resulting in weaker polarization and discontinuous dynamic dissociation depinning transition. As current decreases, on the way back, vortices are retrapped by polarization clouds at the current $J_r<J_c$.

arXiv comment4.2 pages, 3 figures

References in corpus (3)

• Vortex Viscosity in Magnetic Superconductors Due to Radiation of Spin Waves
• Tilting instability and other anomalies in the flux-lattice in some magnetic superconductors
• Visualization of ferromagnetic domains in TbNi${}_2$B${}_2$C and ErNi${}_2$B${}_2$C single crystals: Weak ferromagnetism and its coexistence with superconductivity

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• Enhancement of critical current density in superconducting/magnetic multi-layers with slow magnetic relaxation dynamics and large magnetic susceptibility
• Self-induced pinning of vortices in the presence of ac driving force in magnetic superconductors
• Polaron-like vortices, dissociation transition and self induced pinning in magnetic superconductors