High-temperature superconductor Josephson junctions with a gradient Pr-doped Y[sub 1[minus][ital x]]Pr[sub [ital x]]Ba[sub 2]Cu[sub 3]O[sub 7[minus][delta]] ([ital x]=0. 1, 0. 3, 0. 5) as barriers

Journal Article · Sun Nov 27 23:00:00 EST 1994 · Applied Physics Letters; (United States)

DOI:https://doi.org/10.1063/1.112518· OSTI ID:7093707

Jia, Q X; Wu, X D; Reager, D; Foltyn, S R; Mombourquette, C; Tiwari, P; Campbell, I H; Houlton, R J; Peterson, D E ^[1]

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1. Superconductivity Technology Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

High-temperature superconductor YBa[sub 2]Cu[sub 3]O[sub 7[minus][delta]] based superconducting-normal-superconducting (SNS) Josephson junctions were fabricated using a unique device design. The normal material included a gradient Pr-doped Y[sub 1[minus][ital x]]Pr[sub [ital x]]Ba[sub 2]Cu[sub 3]O[sub 7[minus][delta]] layer which was composed of a light doping ([ital x]=0.1) next to both YBa[sub 2]Cu[sub 3]O[sub 7[minus][delta]] electrodes, a slightly higher doping ([ital x]=0.3) towards the center, and a doping concentration of [ital x]=0.5 in the middle of the [ital N] layer. This design graded the lattice mismatch between YBa[sub 2]Cu[sub 3]O[sub 7[minus][delta]] and the [ital N] layer, thus avoiding the accumulation of all the lattice strain at one interface. It also results in good chemical, thermal, and structural compatibility between adjacent layers for the desired multilayer structures. The SNS junctions fabricated in this way showed resistively shunted junction current-voltage characteristics under dc bias and Shapiro steps under microwave irradiation at a temperature in the range of 75--87 K. Direct current superconducting quantum interference devices showed a voltage modulation about 5 [mu]V by a magnetic field at liquid nitrogen temperature.

• OSTI ID: 7093707
• Journal Information: Applied Physics Letters; (United States), Journal Name: Applied Physics Letters; (United States) Vol. 65:22; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
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MEASURING INSTRUMENTS
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PHYSICAL PROPERTIES
SQUID DEVICES
SUPERCONDUCTING DEVICES
SUPERCONDUCTING JUNCTIONS
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