Absence of correlated flux pinning by columnar defects in irradiated epitaxial Bi2Sr2CaCu2O8 thin films |
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| Institution: | 1. Institut für Physik, Johannes Gutenberg-Universität Mainz, D-55099 Mainz, Germany;2. Gesellschaft für Schwerionenforschung, Planckstr. 1, D-64291 Darmstadt, Germany;1. School of Physics, Devi Ahilya University, Indore - 452001, India;2. Department of Physics and Astronomy, Seoul National University, Seoul - 08826, South Korea;3. UGC-DAE Consortium for Scientific Research, Indore - 452001, India;4. Department of Applied Physics and Optoelectronics, Shri GS Institute of Technology and Science, Indore - 452017, India;1. Center for Solid State Physics and New Materials, Institute of Physics Belgrade, University of Belgrade, Pregrevica 118, 11080 Belgrade, Serbia;2. Scientific Computing Laboratory, Institute of Physics Belgrade, University of Belgrade, Pregrevica 118, 11080 Belgrade, Serbia;3. Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA;1. IFIMUP and IN-Institute of Nanoscience and Nanotechnology, Departamento de Física e Astronomia da Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 687, Porto 4169-007, Portugal;2. Centro de Química—Vila Real, Departamento de Química, Universidade de Trás-os-Montes e Alto Douro, Vila Real 5000-801, Portugal;3. Materials Research and Technology Department, Luxembourg Institute of Science and Technology, 41, Rue du Brill, Belvaux L-4422, Luxembourg;4. Physics and Materials Science Research Unit, University of Luxembourg, 41 Rue du Brill, Belvaux L-4422, Luxembourg;1. Institute of Spectroscopy, RAS, Moscow, Troitsk 142190, Russia;2. Department of Physics, New Jersey Institute of Technology, Newark, NJ 07102, USA;3. Kirenskiy Institute of Physics, Siberian Branch of RAS, Krasnoyarsk 660036, Russia |
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| Abstract: | Using heavy-ion irradiation, we produced columnar defects of different density and orientation in epitaxial Bi2Sr2CaCu2O8 thin films. Although this increases the normal state resistivity and the critical temperature is reduced proportionally to the volume fraction of damaged material, pinning-related quantities like critical current density, activation energy and depinning field are enhanced in external magnetic fields. Transport measurements in dependence of the magnetic field and its orientation consistently indicate two-dimensional pinning of pancake vortices at the columnar defects. We observe the absence of correlated flux pinning by columnar defects and compare to heavy-ion-irradiated single crystals and tapes, where line-like correlations have been observed. |
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