Electron transport in hybrid superconductor heterostructures with manganite interlayers
Artikel i vetenskaplig tidskrift, 2011

Hybrid herostructures comprising an YBa(2)Cu(3)O (x) (YBCO) high-temperature superconductor (HTS) layer and Nb/Au low-temperature superconductor (LTS) bilayer (with critical HTS and LTS temperatures T (c) and T'(c), respectively), separated by a thin (d (M) = 5-20 nm) interlayer of LaMnO(3), La(0.7)Ca(0.3)MnO(3), or La(0.7)Sr(0.3)MnO(3) manganite have been studied. The electric resistance and magnetic properties of individual (evaporated directly onto the substrate) manganite films and related hybrid herostructures have been measured. Based on quasi-classical equations, analytical expressions for the conductivity of herostructures at T a parts per thousand currency sign T'(c) are obtained in the case of a low-transparency superconductor/manganite interface. It is established that the conductivity of heterostructures is determined by the proximity effect (related to the penetration of a condensate wavefunction from the Nb/Au bilayer to manganite) and depends strongly on interface transparency. At low temperatures (T a parts per thousand(a) T (c)'), the conductivity peaks are found at voltages determined by the exchange field of the manganite interlayer. At T (c)' < T < T (c), conductivity features at nearly zero bias voltages are observed, which are related to the superconductivity of the YBCO electrode.

ferromagnet structures

junctions

layers

magnetizations

interfaces

Författare

A. M. Petrzhik

National Research University of Electronic Technology (MIET)

Gennady Ovsyannikov

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

A. V. Shadrin

National Research University of Electronic Technology (MIET)

Chalmers University of Technology

K. I. Konstantinyan

National Research University of Electronic Technology (MIET)

A. V. Zaǐtsev

National Research University of Electronic Technology (MIET)

V. V. Demidov

National Research University of Electronic Technology (MIET)

Yu V. Kislinskiǐ

National Research University of Electronic Technology (MIET)

Journal of Experimental and Theoretical Physics

1063-7761 (ISSN) 1090-6509 (eISSN)

Vol. 112 1042-1050

Ämneskategorier

Fysik

DOI

10.1134/s1063776111050177