Artificial grain boundary Josephson junctions-properties and applications

Z. G. Ivanov; J. A. Alarco; T. Claeson; P. A. Nilsson; E. Olsson; H. K. Olsson; E. A. Stepantsov; D. Winkler; Alexander Tzalenchuk

Artificial grain boundary Josephson junctions-properties and applications

Z. G. Ivanov, J. A. Alarco, T. Claeson, P. A. Nilsson, E. Olsson, H. K. Olsson, E. A. Stepantsov, D. Winkler, Alexander Tzalenchuk

Department of Physics

Research output: Contribution to journal › Article › peer-review

Abstract

Engineered grain boundary Josephson junctions in YBaCuO were formed on bi-crystal Y-ZrO 2 substrates. Laser deposited films were patterned into micron size microbridges. The authors observed a pronounced correlation between superconducting transport properties of grain boundary junctions and the misorientation angle thetas between the two halves of the bi-crystal. The critical Josephson current I c decreased about four orders of magnitude as thetas was increased from 0 to 45 degrees. Clear microwave and magnetic field responses were observed at 77 K. At this temperature, critical current times normal resistance products, I cR n, of up to 1 mV were measured for low angle grain boundaries and Shapiro steps were observed up to that voltage, DC SQUIDs were fabricated and best performance at 77 K was obtained for thetas=32deg with a 4 micrometer strip width. To utilize the higher I cR n value of a lower thetas, sub-micron junctions have to be developed

Original language	English
Pages (from-to)	722
Journal	Proceedings of the Beijing International Conference: High Temperature Superconductivity (BHTSC '92)
Publication status	Published - 1993

Cite this

@article{463ce22b2dd94167b0fff5bbfc98a7be,

title = "Artificial grain boundary Josephson junctions-properties and applications",

abstract = "Engineered grain boundary Josephson junctions in YBaCuO were formed on bi-crystal Y-ZrO 2 substrates. Laser deposited films were patterned into micron size microbridges. The authors observed a pronounced correlation between superconducting transport properties of grain boundary junctions and the misorientation angle thetas between the two halves of the bi-crystal. The critical Josephson current I c decreased about four orders of magnitude as thetas was increased from 0 to 45 degrees. Clear microwave and magnetic field responses were observed at 77 K. At this temperature, critical current times normal resistance products, I cR n, of up to 1 mV were measured for low angle grain boundaries and Shapiro steps were observed up to that voltage, DC SQUIDs were fabricated and best performance at 77 K was obtained for thetas=32deg with a 4 micrometer strip width. To utilize the higher I cR n value of a lower thetas, sub-micron junctions have to be developed",

author = "Ivanov, {Z. G.} and Alarco, {J. A.} and T. Claeson and Nilsson, {P. A.} and E. Olsson and Olsson, {H. K.} and Stepantsov, {E. A.} and D. Winkler and Alexander Tzalenchuk",

year = "1993",

language = "English",

pages = "722",

journal = "Proceedings of the Beijing International Conference: High Temperature Superconductivity (BHTSC '92)",

}

TY - JOUR

T1 - Artificial grain boundary Josephson junctions-properties and applications

AU - Ivanov, Z. G.

AU - Alarco, J. A.

AU - Claeson, T.

AU - Nilsson, P. A.

AU - Olsson, E.

AU - Olsson, H. K.

AU - Stepantsov, E. A.

AU - Winkler, D.

AU - Tzalenchuk, Alexander

PY - 1993

Y1 - 1993

N2 - Engineered grain boundary Josephson junctions in YBaCuO were formed on bi-crystal Y-ZrO 2 substrates. Laser deposited films were patterned into micron size microbridges. The authors observed a pronounced correlation between superconducting transport properties of grain boundary junctions and the misorientation angle thetas between the two halves of the bi-crystal. The critical Josephson current I c decreased about four orders of magnitude as thetas was increased from 0 to 45 degrees. Clear microwave and magnetic field responses were observed at 77 K. At this temperature, critical current times normal resistance products, I cR n, of up to 1 mV were measured for low angle grain boundaries and Shapiro steps were observed up to that voltage, DC SQUIDs were fabricated and best performance at 77 K was obtained for thetas=32deg with a 4 micrometer strip width. To utilize the higher I cR n value of a lower thetas, sub-micron junctions have to be developed

AB - Engineered grain boundary Josephson junctions in YBaCuO were formed on bi-crystal Y-ZrO 2 substrates. Laser deposited films were patterned into micron size microbridges. The authors observed a pronounced correlation between superconducting transport properties of grain boundary junctions and the misorientation angle thetas between the two halves of the bi-crystal. The critical Josephson current I c decreased about four orders of magnitude as thetas was increased from 0 to 45 degrees. Clear microwave and magnetic field responses were observed at 77 K. At this temperature, critical current times normal resistance products, I cR n, of up to 1 mV were measured for low angle grain boundaries and Shapiro steps were observed up to that voltage, DC SQUIDs were fabricated and best performance at 77 K was obtained for thetas=32deg with a 4 micrometer strip width. To utilize the higher I cR n value of a lower thetas, sub-micron junctions have to be developed

M3 - Article

SP - 722

JO - Proceedings of the Beijing International Conference: High Temperature Superconductivity (BHTSC '92)

JF - Proceedings of the Beijing International Conference: High Temperature Superconductivity (BHTSC '92)

ER -