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To be presented at "16th International Workshop on Oxide Electronics"
Session Code: 16

Superconducting current transport in hybrid oxide heterostructure with
magnetic interlayer

G.A. Ovsyannikov, K.Y. Constantinian, Y.V. Kislinski, A.V. Shadrin, A.V.
Zaitsev, V.V. Demidov, I.V. Borisenko
Kotelnikov Institute of Radio Engineering and Electronics, Russian Academy
of Sciences, 125009, Moscow, Russia

D. Winkler
Department of Microtechnology and Nanoscience, Chalmers University of
Technology, S41296, Gothenburg, Swеden

P.V. Komissinskiy
Department of Materials Science, Darmstadt University of Technology, 64287
Darmstadt, Germany

We report on the experimental studies of the dc and rf current transport in
hybrid thin film S-N-M-D Mesa HeteroStructures (MHS) of Nb/Au/M/YBa2Cu3O7-(
with areas from 10(10 up to 50(50 (m2. Here Nb is a conventional s-wave
superconductor (S), YBa2Cu3O7-( (YBCO) is an oxide d-wave superconductor
(D), Au is the normal metal (N), and M is magneto-active interlayer or Ca1-
xSrxCuO2 (CSCO) that is a quasi-two dimensional Heisenberg
antiferromagnetic cuprate or La1-yCayMnO3 (y=0 and y=0.3)that is a the
mixed-valence manganite exhibiting both antiferromagnetism or
ferromagnetism depending on Ca doping (y value). Since epitaxial growth of
oxide film the sharp interface between superconducting and magneto-active
thin film is realizad [1]. The critical current density of MHS
exponentially decreases with the thickness dM of CSCO interlayer while
characteristic resistance increase so the characteristic voltage depend on
dM slowly Finally the critical current is observed in MHS with CSCO
interlayer up to ds=50 nm. We have no observed critical current in MHS with
LSMO interlay for dM=5 nm. (- Josephson junction that interesting for
quantum cubits could be created on the base of MHS with CSCO interlayer.
References
1. P. Komissinskiy et al., Phys. Rev. Lett. . 99, 017004 (2007)