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Fabrication and characterization of ...

Romaine, Suzanne Elizabeth.

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Fabrication and characterization of weak links anddc SQUIDs in the high-temperature superconductor yttrium barium copper oxide.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Fabrication and characterization of weak links anddc SQUIDs in the high-temperature superconductor yttrium barium copper oxide./
Author:	Romaine, Suzanne Elizabeth.
Description:	151 p.
Notes:	Source: Dissertation Abstracts International, Volume: 53-04, Section: B, page: 1910.
Contained By:	Dissertation Abstracts International53-04B.
Subject:	Physics, Condensed Matter. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9223308

Fabrication and characterization of weak links anddc SQUIDs in the high-temperature superconductor yttrium barium copper oxide.
Romaine, Suzanne Elizabeth.

Fabrication and characterization of weak links anddc SQUIDs in the high-temperature superconductor yttrium barium copper oxide. - 151 p.

Source: Dissertation Abstracts International, Volume: 53-04, Section: B, page: 1910.

Thesis (Ph.D.)--Boston University, 1992.

Electron beam lithography and liftoff have been used to pattern sub-quarter-micron weak links in Subjects--Topical Terms:

1018743
Physics, Condensed Matter.

Fabrication and characterization of weak links anddc SQUIDs in the high-temperature superconductor yttrium barium copper oxide.
LDR:02839nmm 2200325 4500 001 1837835
005 20050506074602.5
008 130614s1992 eng d
035 $a (UnM)AAI9223308
035 $a AAI9223308
040 $a UnM $c UnM
100 1 $a Romaine, Suzanne Elizabeth. $3 1926265
245 1 0 $a Fabrication and characterization of weak links anddc SQUIDs in the high-temperature superconductor yttrium barium copper oxide.
300 $a 151 p.
500 $a Source: Dissertation Abstracts International, Volume: 53-04, Section: B, page: 1910.
500 $a Major Professor: William J. Skocpol.
502 $a Thesis (Ph.D.)--Boston University, 1992.
520 $a Electron beam lithography and liftoff have been used to pattern sub-quarter-micron weak links in $ (YBCO) thin films deposited by co-evaporation. These devices have been characterized by investigating their response to applied direct (dc) and radio frequency (rf) currents and these junctions reproducibly show the ac Josephson effect.
520 $a Microscopic examination of the bridge structures has revealed unexpected growth patterns of the YBCO material during post-deposition annealing. Faceting, which occurs in the corners of small (i.e. width $< $ 350 nm) bridges, indicates motion of the material over a relatively large distance during growth. The type of layering seen in these bridges indicates that there is also a high degree of mixing during growth.
520 $a These junctions have also been used to fabricate a dc SQUID which has 150 nm junctions, the smallest yet reported. In the case of the dc SQUID, its response to an applied magnetic field has been evaluated and the changes in this response as a function of temperature and applied bias current have been studied.
520 $a This SQUID not only functions at 77 K, but also has a greater voltage modulation at this temperature than typical grain boundary junction SQUIDS. At 77 K the voltage response to dc flux is sinusoidal and nonhysteretic, with maximum peak-to-peak amplitude of 5 $\ mu $\ mu $ 1. At lower temperatures, the maximum response oscillates in the range 4-6 $\ mu $\ sb{c} $. The amplitude of the steps oscillates with microwave power with the usual quasi-Bessel function pattern.
520 $a Random telegraph noise was observed in this SQUID near 30-40 K and speculations as to the mechanisms responsible for this behavior are presented. Also, a possible explanation for the Josephson junction behavior of our sub-micron bridges is offered in light of recent results reported for other YBCO junctions.
590 $a School code: 0017.
650 4 $a Physics, Condensed Matter. $3 1018743
650 4 $a Physics, General. $3 1018488
650 4 $a Physics, Electricity and Magnetism. $3 1019535
690 $a 0611
690 $a 0605
690 $a 0607
710 2 0 $a Boston University. $3 1017454
773 0 $t Dissertation Abstracts International $g 53-04B.
790 1 0 $a Skocpol, William J., $e advisor
790 $a 0017
791 $a Ph.D.
792 $a 1992
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9223308