Vortex Dynamics in Bi₂Sr₂CaCu₂O₈ Single Crystal with Low Density Columnar Defects Studied by Magnetic Force Microscope

Authors: Pi U.H.¹; Kim D.H.²; Khim Z.G.¹; Kaiser U.³; Liebmann M.³; Schwarz A.³; Wiesendanger R.³

Source: Journal of Low Temperature Physics, Volume 131, Numbers 5-6, June 2003 , pp. 993-1002(10)

Publisher: Springer

Buy & download fulltext article:

Price: $47.00 plus tax (Refund Policy)

Abstract:

We have studied vortex dynamics in Bi₂Sr₂CaCu₂O₈ single crystal with low density columnar defects by using a magnetic force microscope. Single crystal Bi₂Sr₂CaCu₂O₈ sample was irradiated by 1.3 GeV uranium ion to form artificial pinning centers along the crystalline c-axis. The irradiation dose corresponded to a matching field of 20 gauss. The radius of an individual vortex is approximately 140 nm, which is close to the penetration depth of this material. Magnetic force microscope (MFM) images show that intrinsic crystalline defects such as stacking fault dislocations are very effective pinning centers for vortices in addition to the pinning centers due to ion bombardment. By counting the number of vortex, we found that the flux trapped at each pinning center is a single flux quantum. At higher magnetic field, the vortex structure showed an Abrikosov lattice disturbed only by immobile vortices located at pinning centers. When increasing or decreasing the external magnetic field, the spatial distribution of vortices showed a Bean model like behavior.

Language: English

Document Type: Research article

Affiliations: 1: School of Physics, Seoul National University, Seoul 151-742, South Korea 2: Department of Physics, Yeungnam University, Kyunsan, South Korea 3: Institute of Applied Physics, University of Hamburg, D-20355 Hamburg, Germany

Publication date: 2003-06-01