Stray field enhanced vortex dissipation in YBa2Cu3O7/La0.7Sr0.3MnO3/YBa2Cu3O7 hetero-epitaxial tri-layer

Abstract

In this work, we report observation of two superconducting transitions and their response to an external field in pulsed laser deposited YBa2Cu3O7/La0.7Sr0.3MnO3/YBa2Cu3O7 (Y-L-Y) hetero-epitaxial tri-layer. Magnetization data of Y-L-Y tri-layer in “out-plane” geometry showed a single Meissner transition indicating superconductivity of the top and bottom YBa2Cu3O7 layers to be magnetically coupled. In contradiction, the magneto-transport data unusually showed two transition onsets Tcon1 and Tcon2 implying electrically decoupled superconductivity. The Tcon1 decreased systematically with field, whereas Tcon2 showed anomalous behavior with substantial increase in transition width due to the local stray field induced vortex states.

Internal flux dynamics and stray field-mediated coupling in the AC susceptibility response of Nb/Ni thin-film bilayers

“…The experiments performed in this study are analogous to a series of results reported in many important studies [1][2][3][4][5][6]18]. The main difference lies in the measuring parameter employed and the information that it provides.…”

“…Hybrid structures composed of ferromagnetic (F) and super conducting (S) thin films have been the subject of extensive experimental and theoretical work. Typical results deal mainly with variations in the resistance (R) and critical the temper ature (T c ) of the superconducting state under the influence of an F layer [1][2][3][4]. Recently, these hybrid systems have been observed to sustain spinpolarized supercurrents if triplet pairing of electrons is promoted by the addition of a non collinear ferromagnetic film at the S/F interface [5,6].…”