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Please use this identifier to cite or link to this item: http://ir.ncue.edu.tw/ir/handle/987654321/15430

Title: Temperature Dependent Pinning Phenomenon in Superconducting Nb Films with Triangular and Honeycomb Pinning Arrays
Authors: Cao, R.;Yang, T. J.;Wu, T. C.;Wu, J. C.;Horng, Lance
Contributors: 物理學系
Date: 2009
Issue Date: 2013-02-05T02:20:27Z
Publisher: IOP Publishing
Abstract: The pinning phenomena in superconducting Nb films with triangular and honeycomb pinning arrays were explored. Special temperature dependent phenomena were found for both films. For the film with a triangular pinning array, the pronounced matching peaks in the critical currents as a function of magnetic field reduce from six to three within a narrow temperature range. This temperature dependent matching effect is explained by considering the dramatic change of coherent length with temperature when the temperature is close to Tc. In order to compare with the film with a triangular pinning array, we fabricated a film with a honeycomb pinning array with similar pinning site spacing and pinning size. Special prominent matching peaks at H = 3.5H1 were found for this film. Molecular dynamic simulations were made to study this phenomenon. The ground state distribution of vortices obtained from simulations reasonably explains the prominent matching peaks. Pronounced temperature dependent matching effects were also found for the film with a honeycomb pinning array.
Relation: J. of Physics: Condensed Matter, 21(7): 075705
Appears in Collections:[物理學系] 期刊論文

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