Abstract
YBa2Cu3O7-δ/La1-x-yPrxCayMnO3 (YBCO/LPCMO) (x ~ 0.31, y ~ 0.35) bilayers with fixed ferromagnetic layer thickness dFM ~ 126 nm and superconducting layer thicknesses of dSC ~ 80 nm and 160 nm have been grown by a combination of RF magnetron sputtering and pulsed laser deposition on SrTiO3 (001) substrates. If dSC < dFM) the bilayer (i) shows a sharp decline in the superconducting transition temperature (Tc), (ii) has smaller activation energy (U0) for thermally activated flux flow (TAFF), (iii) possesses a smaller upper critical field (Hc2) and (iv) shows reduced irreversibility field (Hirr). When dSC > dFM, the bilayers exhibit a larger U0, and higher Hc2, with an irreversibility line above the pure YBCO in the higher temperature and lower field regimes. The analysis of the magnetic field–dependent activation energy in terms of \({U}_{0}\sim {H}^{-\alpha }\) and \({U}_{0}=A-Bln\; H\) supports the presence of two-dimensional (2D) vortex structure in pure YBCO and bilayer with dSC < dFM. The bilayer with dSC > dFM shows abnormal behavior. The analysis of the Hirr (T) data in terms of the power relationship of the form, \({H}_{\mathrm{irr}}\left(T\right)={H}_{0}{\left[1-\frac{{T}_{\mathrm{irr}}(H)}{{T}_{c}}\right]}^{n}\) confirms an improved flux pinning in the thicker YBCO film and bilayer with dSC > dFM. The enhanced vortex pinning in this bilayer could be explained by the interfacial pinning caused by the FM domains. The interaction between superconductivity and ferromagnetism in the bilayers is also supported by magnetization measurements.
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Acknowledgements
Suman Kumari acknowledges the Department of Science and Technology (Government of India) for the award of the INSPIRE fellowship. The authors are also thankful to Dr. K.K. Maurya for the structural characterization.
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The work was carried out on the facilities created during the 12th five-year plan project AQuaRIUS funded by CSIR. The authors acknowledge the support from IIT Roorkee through the SMILE-13 grant.
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Kumari, S., Anas, M., Raghav, D.S. et al. A Comparative Study of Superconductivity and Thermally Activated Flux Flow of YBa2Cu3O7-δ and YBa2Cu3O7-δ/La1-x-yPrxCayMnO3 Bilayers. J Supercond Nov Magn 35, 3225–3240 (2022). https://doi.org/10.1007/s10948-022-06381-8
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DOI: https://doi.org/10.1007/s10948-022-06381-8