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Apparent negative motion of vortex matter due to inhomogeneous pinning

Apparent negative motion of vortex matter due to inhomogeneous pinning
Apparent negative motion of vortex matter due to inhomogeneous pinning
We investigate the transport of vortices in superconductors with inhomgeneous pinning under a driving force. The inhomogeneity of pinning is simplified as strong-weak pinning regions. It is demonstrated that the interactions between the vortices captured by strong pinning potentials and the vortices in the weak pinning region cause absolute negative motion (ANM) of vortices: The vortices which are climbing toward the high barriers induced by the strong pinning with the help of driving force move toward the opposite direction of the force and back to their equilibrium positions in the weak pinning region as the force decreases or is withdrawn. Our simulations reveal that the hysteresis of ANM is determined by the competition between the speed of the negative motion which depends on the piining inhomogeneity in superconductors and the speed of the driving force. Under the conditions of either larger force scanning rate or higher pinning inhomogeneity, a marked ANM and a larger hysteretic speed-force loop could be observed. This indicates that the time window to observe the ANM should be chosen properly. Moreover, the V-1 characteristics of Ag-sheathed Bi=2223 tapes are measured, and experimental observations are qualitatively in agreement with the simulation.
1550-235X
1224507-[5pp]
Xu, X.B.
a2ddcbc4-6195-426f-b0dc-60e6f560fa07
Fangohr, H.
9b7cfab9-d5dc-45dc-947c-2eba5c81a160
Ding, S.Y.
fd2e0fdd-9f94-4a65-a228-afffd99c000b
Gu, M.
9f22a6ef-7e9e-4074-b0de-c1e843705d96
Tang, T.B.
29a9ec7d-7a81-46b8-9f99-cba265e65f6f
Han, Z.H.
b624b006-357b-4615-96d6-8f86c205d0ca
Shi, D.Q.
294be8e6-69c8-4cac-9fde-4dae24c47748
Dou, S.X.
896fcf39-9c7c-459e-a50b-11efc49b05a6
Xu, X.B.
a2ddcbc4-6195-426f-b0dc-60e6f560fa07
Fangohr, H.
9b7cfab9-d5dc-45dc-947c-2eba5c81a160
Ding, S.Y.
fd2e0fdd-9f94-4a65-a228-afffd99c000b
Gu, M.
9f22a6ef-7e9e-4074-b0de-c1e843705d96
Tang, T.B.
29a9ec7d-7a81-46b8-9f99-cba265e65f6f
Han, Z.H.
b624b006-357b-4615-96d6-8f86c205d0ca
Shi, D.Q.
294be8e6-69c8-4cac-9fde-4dae24c47748
Dou, S.X.
896fcf39-9c7c-459e-a50b-11efc49b05a6

Xu, X.B., Fangohr, H., Ding, S.Y., Gu, M., Tang, T.B., Han, Z.H., Shi, D.Q. and Dou, S.X. (2007) Apparent negative motion of vortex matter due to inhomogeneous pinning. Physical Review B, 75 (22), 1224507-[5pp]. (doi:10.1103/PhysRevB.75.224507).

Record type: Article

Abstract

We investigate the transport of vortices in superconductors with inhomgeneous pinning under a driving force. The inhomogeneity of pinning is simplified as strong-weak pinning regions. It is demonstrated that the interactions between the vortices captured by strong pinning potentials and the vortices in the weak pinning region cause absolute negative motion (ANM) of vortices: The vortices which are climbing toward the high barriers induced by the strong pinning with the help of driving force move toward the opposite direction of the force and back to their equilibrium positions in the weak pinning region as the force decreases or is withdrawn. Our simulations reveal that the hysteresis of ANM is determined by the competition between the speed of the negative motion which depends on the piining inhomogeneity in superconductors and the speed of the driving force. Under the conditions of either larger force scanning rate or higher pinning inhomogeneity, a marked ANM and a larger hysteretic speed-force loop could be observed. This indicates that the time window to observe the ANM should be chosen properly. Moreover, the V-1 characteristics of Ag-sheathed Bi=2223 tapes are measured, and experimental observations are qualitatively in agreement with the simulation.

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Submitted date: 17 January 2007
Published date: 13 June 2007

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Local EPrints ID: 50115
URI: https://eprints.soton.ac.uk/id/eprint/50115
ISSN: 1550-235X
PURE UUID: 53892f6f-9f30-4a56-9730-f835b43a36d0

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Date deposited: 28 Jan 2008
Last modified: 13 Mar 2019 20:52

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Contributors

Author: X.B. Xu
Author: H. Fangohr
Author: S.Y. Ding
Author: M. Gu
Author: T.B. Tang
Author: Z.H. Han
Author: D.Q. Shi
Author: S.X. Dou

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