Details

Autor(en) / Beteiligte

• Hjelmeland, T.B.
• Bazioti, C.
• Gunnæs, A.E.
• Volkov, Y.
• Mikheenko, P.

Titel

Effect of colossal magnetoresistance material La0.67Ca0.33MnO3 on superconducting properties of YBa2Cu3O7-δ thin films

Ist Teil von

• Journal of magnetism and magnetic materials, 2019-10, Vol.487, p.165335, Article 165335

Ort / Verlag

Amsterdam: Elsevier B.V

Erscheinungsjahr

2019

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •Multiple contacts allow simple demonstration of the effect of La0.67Ca0.33MnO3 on YBa2Cu3O7-δ.•Spin-polarised current affects both superconducting and normal state of YBa2Cu3O7-δ.•Resistance of bilayer increases below Curie temperature of spin-polarized material.•Spin-polarization creates peak in resistance below the critical temperature.•Graphene solution suppresses superconductivity in polycrystalline YBa2Cu3O7-δ film. By specific design of the sample, in which SrTiO3 substrate is fully covered by a thin layer of the colossal magnetoresistive material La0.67Ca0.33MnO3 (LCMO) and the latter is partially covered by high-temperature superconductor YBa2Cu3O7-δ (YBCO), and by using multiple current and voltage contacts, direct evidence of the strong effect of LCMO on YBCO is obtained. It is found that LCMO strongly influences not only superconducting, but also normal state of YBCO, and it is argued that this is a consequence of the spin injection from the former to the latter. The effect of the deposition conditions and crystal orientation of YBCO layer on this effect is clarified. A surprising peak in the temperature dependence of resistance seen in ex-situ ab-plane oriented sample is explained as a combination of two effects: influence of spin-polarized electrons on superconductor below its critical temperature and the interface-controlled shift of Curie temperature of LCMO to low temperatures. Considering expected use of LCMO and YBCO in composite quantum computation circuits, their combination with another advanced quantum material, graphene, is explored.