Interplay between spin polarization and superconductivity in an ex-situ bilayer La&lt;inf&gt;0.67&lt;/inf&gt;Ca&lt;inf&gt;0.33&lt;/inf&gt;MnO&lt;inf&gt;3&lt;/inf&gt; — YBa&lt;inf&gt;2&lt;/inf&gt;Cu&lt;inf&gt;3&lt;/inf&gt;O&lt;inf&gt;7-δ&lt;/inf&gt;

Fjellvåg, Asbjørn Slagtern; Hjelmeland, Trude Bjørgås; Mollatt, H.J. S.; Qureishy, Thomas; Mikheenko, P.

doi:10.1109/nap.2017.8190363

Cited by 1 publication

(8 citation statements)

References 14 publications

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“…Both YBCO and LCMO layers were oriented with c-axis perpendicular to the plane of the film, and the sample is referred to as in-situ YBCO/LCMO. Another investigated sample is the LCMO/YBCO bilayer previously described in [23]. The YBCO film was grown with resulting ab-plane orientation (c-axis in plane of the sample), as it is confirmed in the current study.…”

Section: Methodssupporting

confidence: 64%

“…Another important issue is the orientation of the YBCO relative to the LCMO in the bilayers. It is now confirmed that in the sample investigated in [23], YBCO is oriented with the ab-planes perpendicular to the plane of the film. Important consequence of this is the shift of Curie temperature (TCurie) of LCMO to a lower temperature, which is close to the critical temperature (Tc) of YBCO [23].…”

Section: Introductionsupporting

confidence: 57%

“…It is now confirmed that in the sample investigated in [23], YBCO is oriented with the ab-planes perpendicular to the plane of the film. Important consequence of this is the shift of Curie temperature (TCurie) of LCMO to a lower temperature, which is close to the critical temperature (Tc) of YBCO [23]. Following this, the paper discusses the effect of YBCO orientation on the properties of the interface between YBCO and LCMO explaining the origin of the resistance peak.…”

Section: Introductionsupporting

confidence: 57%

“…At a defined current path, a variety of measurements could be done using different potential contacts. Before attaching indium contacts, the samples were investigated (see details for the ex-situ sample in [23]) by magneto-optical imaging and scanning electron microscopy. Here the focus is on the electrical transport measurements performed with a constant-voltage load technique.…”

Section: Methodsmentioning

confidence: 99%

“…LCMO and YBCO are delicate compounds. Small changes in their chemical composition, especially oxygen content, presence of impurities or diffusion of elements through the interface can produce unexpected effects, like appearance of stripy magnetic structure and resistance peak below the critical temperature of superconductor found in [23]. Another important issue is the orientation of the YBCO relative to the LCMO in the bilayers.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

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

Hjelmeland

Bazioti

Gunnæs

et al. 2019

Journal of Magnetism and Magnetic Materials

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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- (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.

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Section: Methodssupporting

confidence: 64%

Section: Introductionsupporting

confidence: 57%