Proximity effect and electron transport in oxide hybrid heterostructures with superconducting/magnetic interfaces
Journal article, 2011

We report on electron transport in oxide heterostructures with superconducting/magnetic (S/M) thin film interfaces. The investigated hybrid mesa-heterostructures consist of a cuprate superconductor, a nonsuperconducting cuprate (antiferromagnetic) or manganite (ferromagnetic) interlayer with thickness d(M) = 5-50 nm and a conventional superconductor (Nb). The superconducting critical current (I-C) with a critical current density j(c) = 10(3) A cm(-2) (for d(M) = 10 nm) and a characteristic voltage ICRN = 100-200 mu V (RN is normal resistance) are observed at liquid helium temperature for a CaXSr1-XCuO2 antiferromagnetic cuprate interlayer with a thickness of d(M) = 10-50 nm. The superconducting current-phase relation of heterostructures deviates from the regular sine type, demonstrating a second harmonic component. These hybrid heterostructures with S/M interfaces show unusually high sensitivity to external magnetic fields. When substituting the cuprate interlayer by a manganite film, no critical current was observed although the manganite interlayer was made several times thinner (down to d(M) <= 5 nm).

ferromagnet

josephson-junction

parent

d-wave superconductors

current-phase relation

metal interfaces

ground-state

conductivity

layer

thin-films

Author

Gennady Ovsyannikov

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

K. Y. Constantinian

National Research University of Electronic Technology (MIET)

Y. V. Kislinski

National Research University of Electronic Technology (MIET)

A. V. Shadrin

National Research University of Electronic Technology (MIET)

A. V. Zaǐtsev

National Research University of Electronic Technology (MIET)

A. M. Petrzhik

National Research University of Electronic Technology (MIET)

V. V. Demidov

National Research University of Electronic Technology (MIET)

I. V. Borisenko

National Research University of Electronic Technology (MIET)

Alexei Kalaboukhov

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Dag Winkler

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Superconductor Science and Technology

0953-2048 (ISSN) 1361-6668 (eISSN)

Vol. 24 5 Art. no. 055012-

Areas of Advance

Nanoscience and Nanotechnology (2010-2017)

Subject Categories

Condensed Matter Physics

DOI

10.1088/0953-2048/24/5/055012

More information

Created

10/8/2017