Low Temperature Physics: 40, 621 (2014); https://doi.org/10.1063/1.4887061
Физика Низких Температур: Том 40, Выпуск 7 (Июль 2014), c. 801-806 ( к оглавлению , назад )
Magnetic field penetration in MgB2 single crystals: pinning and Meissner holes
V. Chabanenko1, E. Kuchuk1, V.V. Yurchenko2, P. Mikheenko2, I. Abal’osheva3, R. Cortés-Maldonado4, F. Pérez-Rodríguez4, J. Karpinski5,6, N.D. Zhigadlo5
S. Katrych6, and R. Puźniak3
1A. Galkin Dоnetsk Institute for Physics and Engineering, NASU, Donetsk 83114, Ukraine
2Department of Physics, University of Oslo, P.O. Box 1048, Blindern 0316, Oslo, Norway
3Institute of Physics, Polish Academy of Sciences, Aleja Lotników 32/46, Warsaw 02-668, Poland
4Instituto de Física, Benemérita Universidad Autónoma de Puebla, Puebla, México
5Laboratory for Solid State Physics, ETH Zurich, Zurich 8093, Switzerland
6Institute of Condensed Matter Physics, EPFL, Lausanne 1015, Switzerland
Received February 17, 2014
The evolution of flux distribution in MgB2 single crystals during their remagnetization was imaged with magneto-optical technique. Meissner holes, formed as the areas where the annihilation of vortices and antivortices takes place, were found at the boundary between oppositely magnetized parts of the crystal. Gradient of magnetic induction in the vicinity of Meissner holes was found to be enhanced. Finger-like structures of convex shape, formed during the penetration of magnetic flux inside the crystal, were observed and explained as an effect of inhomogeneous pinning and demagnetizing field redistribution in the sample.
PACS: 74.25.Ha Magnetic properties including vortex structures and related phenomena;
Key words: magnetooptic of flux penetration, vortices, antivortices, Meissner holes, inhomogeneous pinning, single crystal MgB2.
Published online: May 21, 2014