Levitation force relaxation in YBCO superconductors

Near-oscillatory relaxation behavior of levitation force in infiltration and growth processed bulk YBCO/Ag superconducting composites

“…It has been reported that the force decays logarithmically [2,4,6] with time for time periods of duration similar to those used in our measurements. Our results support these reports as shown in Fig.…”

“…The relaxation behavior otherwise follows a well-reported logarithmic decay at each gap distance with time [2] when the magnetic field does not vary. At farther gap distances though, the force decay rate DF/Dt decreases with distance.…”

“…where F is the levitation force of the superconductor and U is the height of the pinning energy barrier [2]. The critical current density of oxide superconductor depends on the ability of the material to pin the magnetic flux.…”

Vibration characteristics of a multi-block high-temperature superconducting maglev system

“…Many theoretical and experimental findings on the levitation and guidance force were obtained under different conditions [1][2][3][4][5]. The studies on the dynamic characteristics of HTS maglev systems, however, are not sufficient.…”

Measurements of the levitation forces for a bulk Gd–Ba–Cu–O superconductor in high magnetic fields

“…For the realization of this system with high power and high efficiency, it is important to increase the stored energy by increasing the levitation force, which is necessary to support a heavy flywheel. It is also important to reduce the time relaxation of the levitating force caused by flux creep in order to ensure stable operation [1,2].…”