磁性超导体中类极化子涡旋和解离脱钉相变的预测：以ErNi2B2C为例
Prediction of polaron-like vortices and dissociation depinning transition in magnetic superconductors: The example of ErNi2B2C
摘要：
在硼碳化物ErNi $_2$ B $_2$ C中，在2.3 K下到相称自旋密度波的相变使得1/20的类伊辛Er自旋实际上是自由的。涡旋不均匀地挤压这些自旋，并在运动时重新挤压它们。在低自旋弛豫率和低偏置电流下，携带磁极化的涡旋云变为极化子状，其速度由有效阻力系数决定，该系数明显大于Bardeen-Stephen（BS）阻力系数。当电流增加时，在临界电流下$J_c$涡旋释放极化云，并且I-V特性中的速度以及电压跳变到与BS阻力系数对应的值。磁场和磁化强度的非均匀分量随速度的增加而下降，导致极化变弱和不连续的动态解离脱钉转变。当电流减少时，在返回的路上，涡流被电流$J_r<J_c$处的极化云重新捕获。
英文摘要：
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 $J_r<J_c$.
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