A1 Refereed original research article in a scientific journal
Search for spin-polarization effects in La(0.7)Mn(0.3)Ca(3)O(3)/YBa(2)Cu(3)O(7-delta) thin-film bilayers
Authors: Deng X, Joshi M, Chakalova R, Colclough MS, Palai R, Tse YY, Jones IP, Huhtinen H, Muirhead CM
Publisher: AMER PHYSICAL SOC
Publication year: 2008
Journal:: Physical Review B
Journal name in source: PHYSICAL REVIEW B
Journal acronym: PHYS REV B
Article number: ARTN 144528
Volume: 77
Issue: 14
Number of pages: 10
ISSN: 1098-0121
DOI: https://doi.org/10.1103/PhysRevB.77.144528
Abstract
We describe a search for the effects of spin-polarized electrons in thin-film bilayers consisting of the high temperature superconductor YBa(2)Cu(3)O(7-delta) and the colossal magnetoresistive material La(0.7)Ca(0.3)MnO(3) by using penetration depth and critical current measurements. The work differs from that described in other works in that the YBa(2)Cu(3)O(7-delta) is grown with its c-axis lying in the plane of the thin film in order to investigate the effects of proximity suppression and also the injection of a spin-polarized current along the a/b-planes of the YBa(2)Cu(3)O(7-delta). We see a number of effects including field dependence of the average penetration depth and apparent suppression of the critical current by an injected current, with a gain greater than unity, but we argue that these are explicable in terms of a combination of heating and current summation, without any need to invoke the spin-polarization of the injected current.
We describe a search for the effects of spin-polarized electrons in thin-film bilayers consisting of the high temperature superconductor YBa(2)Cu(3)O(7-delta) and the colossal magnetoresistive material La(0.7)Ca(0.3)MnO(3) by using penetration depth and critical current measurements. The work differs from that described in other works in that the YBa(2)Cu(3)O(7-delta) is grown with its c-axis lying in the plane of the thin film in order to investigate the effects of proximity suppression and also the injection of a spin-polarized current along the a/b-planes of the YBa(2)Cu(3)O(7-delta). We see a number of effects including field dependence of the average penetration depth and apparent suppression of the critical current by an injected current, with a gain greater than unity, but we argue that these are explicable in terms of a combination of heating and current summation, without any need to invoke the spin-polarization of the injected current.
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