TU Darmstadt / ULB / TUbiblio

Electron transport and microwave dynamics of hybrid Nb/Au/CaSrCuO/YBaCuO planar Josephson junctions

Constantinian, K. Y. and Ovsyannikov, G. A. and Kislinskii, Y. V. and Shadrin, A. V. and Borisenko, I. V. and Komissinskiy, P. V. and Zaitsev, A. V. and Mygind, J. and Winkler, D. (2010):
Electron transport and microwave dynamics of hybrid Nb/Au/CaSrCuO/YBaCuO planar Josephson junctions.
In: Journal of Physics: Conference Series, IOP Science, pp. 042004, 234, (4), ISSN 1742-6596, [Online-Edition: http://dx.doi.org/10.1088/1742-6596/234/4/042004],
[Article]

Abstract

We report on measurements of dc electron transport and microwave dynamics of thin film hybrid Josephson junctions with an oxide antiferromagnetic interlayer. The base superconducting electrode YBaCuO and the antiferromagnetic (AF) interlayer CaSrCuO (with thickness d = 20 - 70 nm) were grown by laser ablation on NdGaO3 substrates. I-V curves were well fitted to RSJ model and had no excess current, ICRN products were of order 0.2 mV at T=4.2 K. We did not observe any noticeable reduction of ICRN with increasing d. Such “tunnellike” behaviour also resulted in appearance of singularities on I-V curve when magnetic field was applied. Oscillating with microwave power integer and half-integer Shapiro steps were registered along with sub-harmonic detector response. Moreover, for some of junctions a “devil” staircase structure was observed on I-V curves and giant noise-like signals were measured in 1-2 GHz band at the certain levels of microwave power. Observed features, noise performance and the impact of the second harmonic in current-phase relation on junction dynamics are discussed taking into account data for structures without AF interlayer.

Item Type: Article
Erschienen: 2010
Creators: Constantinian, K. Y. and Ovsyannikov, G. A. and Kislinskii, Y. V. and Shadrin, A. V. and Borisenko, I. V. and Komissinskiy, P. V. and Zaitsev, A. V. and Mygind, J. and Winkler, D.
Title: Electron transport and microwave dynamics of hybrid Nb/Au/CaSrCuO/YBaCuO planar Josephson junctions
Language: English
Abstract:

We report on measurements of dc electron transport and microwave dynamics of thin film hybrid Josephson junctions with an oxide antiferromagnetic interlayer. The base superconducting electrode YBaCuO and the antiferromagnetic (AF) interlayer CaSrCuO (with thickness d = 20 - 70 nm) were grown by laser ablation on NdGaO3 substrates. I-V curves were well fitted to RSJ model and had no excess current, ICRN products were of order 0.2 mV at T=4.2 K. We did not observe any noticeable reduction of ICRN with increasing d. Such “tunnellike” behaviour also resulted in appearance of singularities on I-V curve when magnetic field was applied. Oscillating with microwave power integer and half-integer Shapiro steps were registered along with sub-harmonic detector response. Moreover, for some of junctions a “devil” staircase structure was observed on I-V curves and giant noise-like signals were measured in 1-2 GHz band at the certain levels of microwave power. Observed features, noise performance and the impact of the second harmonic in current-phase relation on junction dynamics are discussed taking into account data for structures without AF interlayer.

Journal or Publication Title: Journal of Physics: Conference Series
Volume: 234
Number: 4
Publisher: IOP Science
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Advanced Thin Film Technology
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 29 Mar 2012 11:30
Official URL: http://dx.doi.org/10.1088/1742-6596/234/4/042004
Identification Number: doi:10.1088/1742-6596/234/4/042004
Export:

Optionen (nur für Redakteure)

View Item View Item