TY - JOUR
T1 - Pinning of spiral fluxons by giant screw dislocations in YBa2Cu3O7 - δ single crystals
T2 - Josephson analog of the fishtail effect
AU - Sergeenkov, S.
AU - Cichetto, L.
AU - Garcia Rivera, Victor Anthony
AU - Stari, C.
AU - Marega, E.
AU - Cardoso, C. A.
AU - Araujo-Moreira, F. M.
N1 - Copyright:
Copyright 2010 Elsevier B.V., All rights reserved.
PY - 2010/3
Y1 - 2010/3
N2 - By using a highly sensitive homemade AC magnetic susceptibility technique, the magnetic flux penetration has been measured in YBa2Cu3O7 - δ single crystals with giant screw dislocations (having the structure of the Archimedean spirals) exhibiting a = 3 spiral turnings, the pitch b = 18.7 μm and the step height c = 1.2 nm (the last parameter is responsible for creation of extended weak-link structure around the giant defects). The magnetic field applied parallel to the surface enters winding around the weak-link regions of the screw in the form of the so-called spiral Josephson fluxons characterized by the temperature dependent pitch bf(T). For a given temperature, a stabilization of the fluxon structure occurs when bf(T) matches b (meaning an optimal pinning by the screw dislocations) and manifests itself as a pronounced low-field peak in the dependence of the susceptibility on magnetic field (applied normally to the surface) in the form resembling the high-field (Abrikosov) fishtail effect.
AB - By using a highly sensitive homemade AC magnetic susceptibility technique, the magnetic flux penetration has been measured in YBa2Cu3O7 - δ single crystals with giant screw dislocations (having the structure of the Archimedean spirals) exhibiting a = 3 spiral turnings, the pitch b = 18.7 μm and the step height c = 1.2 nm (the last parameter is responsible for creation of extended weak-link structure around the giant defects). The magnetic field applied parallel to the surface enters winding around the weak-link regions of the screw in the form of the so-called spiral Josephson fluxons characterized by the temperature dependent pitch bf(T). For a given temperature, a stabilization of the fluxon structure occurs when bf(T) matches b (meaning an optimal pinning by the screw dislocations) and manifests itself as a pronounced low-field peak in the dependence of the susceptibility on magnetic field (applied normally to the surface) in the form resembling the high-field (Abrikosov) fishtail effect.
UR - http://www.scopus.com/inward/record.url?scp=77949420246&partnerID=8YFLogxK
U2 - 10.1134/S0021364010010078
DO - 10.1134/S0021364010010078
M3 - Artículo
AN - SCOPUS:77949420246
SN - 0021-3640
VL - 91
SP - 30
EP - 34
JO - JETP Letters
JF - JETP Letters
IS - 1
ER -