Magnetic field penetration in MgB₂ single crystals: pinning and Meissner holes

Magnetic field penetration in MgB₂ single crystals: pinning and Meissner holes

Chabanenko, V. ; Kuchuk, Е. ; Yurchenko, V.V. ; Mikheenko, P. ; Abal’osheva, I. ; Cortés-Maldonado, R. ; Pérez-Rodríguez, F. ; Karpinski, J. ; Zhigadlo, N.D. ; Katrych, S. ; Puźniak, R.

Тема: Свеpхпpоводимость, в том числе высокотемпеpатуpная

Інший ID: PACS 74.25.Ha, 78.20.Ls, 74.25.Wx

URI: http://dspace.nbuv.gov.ua/handle/123456789/119540

Посилання: Magnetic field penetration in MgB₂ single crystals: pinning and Meissner holes / V. Chabanenko, E. Kuchuk, V.V. Yurchenko, P. Mikheenko, I. Abal’osheva, R. Cortés-Maldonado, F. Pérez-Rodríguez, J. Karpinski, N.D. Zhigadlo, S. Katrych, R. Puźniak // Физика низких температур. — 2014. — Т. 40, № 7. — С. 801-806. — Бібліогр.: 12 назв. — англ.

Підтримка: This work was partially supported by SEP-CONACYT (Mexico) under grant CB-2012-01-183673, by the National Science Centre of Poland based on decision No. DEC- 2013/08/M/ST3/00927, and by Swiss National Science Foundation. J.K and S.K acknowledge support of European Community FP7 Project Super-Iron. Authors wish to thank V.V. Burkhovetskii for electron microscope images of crystals.

Дата: 2014

Завантажень: 534

Magnetic field penetration in MgB₂ single crystals: pinning and Meissner holes

Анотація:

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.

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