YBCO DC SQUID of MOCVD thin film bridge

Akinobu Irie; Masanori Era; Tsutomu Yamashita; Hideyuki Kurosawa; Hisanori Yamane; Toshio Hirai

doi:10.1143/JJAP.28.L1816

YBCO DC SQUID of MOCVD thin film bridge

Akinobu Irie, Masanori Era, Tsutomu Yamashita, Hideyuki Kurosawa, Hisanori Yamane, Toshio Hirai

Division of Inorganic Material Research

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

3 Citations (Scopus)

Abstract

Using YBa₂Cu₃O_7-x (YBCO) thin films (0.5∼1.0 µm in thickness) with c axis orientation, we fabricated dc superconducting quantum interference devices (SQUIDs). YBCO films were deposited on MgO(100) single-crystal infstrates by MOCVD. These films exhibit zero resistance above 80 K and critical current density of 10⁴ to 10⁵ A/cm² at 77 K. The SQUIDs with microbridge are fabricated by photolithography and chemical etching techniques. The maximum voltage modulation is about 80 µV for the YBCO dc SQUID with an inductance of 70 pH, and intrinsic energy sensitivity is 740 h (h: Planck’s constant) at 4.2 K. Furthermore, the SQUID was operated in flux-locked loop. The minimum flux noise in the flux-locked SQUID is 1.5×10^-5φ₀/√Hz in the white noise region at 4.2 K. The experiments suggest that the current-phase relationship of a micrometer-long YBCO bridge may be sinusoidal.

Original language	English
Pages (from-to)	L1816-L1819
Journal	Japanese journal of applied physics
Volume	28
Issue number	10 A
DOIs	https://doi.org/10.1143/JJAP.28.L1816
Publication status	Published - 1989 Oct

Keywords

Mocvd
Thin film bridge
Ybco dc SQUID

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy(all)

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10.1143/JJAP.28.L1816

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title = "YBCO DC SQUID of MOCVD thin film bridge",

abstract = "Using YBa2Cu3O7-x (YBCO) thin films (0.5∼1.0 µm in thickness) with c axis orientation, we fabricated dc superconducting quantum interference devices (SQUIDs). YBCO films were deposited on MgO(100) single-crystal infstrates by MOCVD. These films exhibit zero resistance above 80 K and critical current density of 104 to 105 A/cm2 at 77 K. The SQUIDs with microbridge are fabricated by photolithography and chemical etching techniques. The maximum voltage modulation is about 80 µV for the YBCO dc SQUID with an inductance of 70 pH, and intrinsic energy sensitivity is 740 h (h: Planck{\textquoteright}s constant) at 4.2 K. Furthermore, the SQUID was operated in flux-locked loop. The minimum flux noise in the flux-locked SQUID is 1.5×10-5φ0/√Hz in the white noise region at 4.2 K. The experiments suggest that the current-phase relationship of a micrometer-long YBCO bridge may be sinusoidal.",

keywords = "Mocvd, Thin film bridge, Ybco dc SQUID",

author = "Akinobu Irie and Masanori Era and Tsutomu Yamashita and Hideyuki Kurosawa and Hisanori Yamane and Toshio Hirai",

year = "1989",

month = oct,

doi = "10.1143/JJAP.28.L1816",

language = "English",

volume = "28",

pages = "L1816--L1819",

journal = "Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes",

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publisher = "Japan Society of Applied Physics",

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TY - JOUR

T1 - YBCO DC SQUID of MOCVD thin film bridge

AU - Irie, Akinobu

AU - Era, Masanori

AU - Yamashita, Tsutomu

AU - Kurosawa, Hideyuki

AU - Yamane, Hisanori

AU - Hirai, Toshio

PY - 1989/10

Y1 - 1989/10

N2 - Using YBa2Cu3O7-x (YBCO) thin films (0.5∼1.0 µm in thickness) with c axis orientation, we fabricated dc superconducting quantum interference devices (SQUIDs). YBCO films were deposited on MgO(100) single-crystal infstrates by MOCVD. These films exhibit zero resistance above 80 K and critical current density of 104 to 105 A/cm2 at 77 K. The SQUIDs with microbridge are fabricated by photolithography and chemical etching techniques. The maximum voltage modulation is about 80 µV for the YBCO dc SQUID with an inductance of 70 pH, and intrinsic energy sensitivity is 740 h (h: Planck’s constant) at 4.2 K. Furthermore, the SQUID was operated in flux-locked loop. The minimum flux noise in the flux-locked SQUID is 1.5×10-5φ0/√Hz in the white noise region at 4.2 K. The experiments suggest that the current-phase relationship of a micrometer-long YBCO bridge may be sinusoidal.

AB - Using YBa2Cu3O7-x (YBCO) thin films (0.5∼1.0 µm in thickness) with c axis orientation, we fabricated dc superconducting quantum interference devices (SQUIDs). YBCO films were deposited on MgO(100) single-crystal infstrates by MOCVD. These films exhibit zero resistance above 80 K and critical current density of 104 to 105 A/cm2 at 77 K. The SQUIDs with microbridge are fabricated by photolithography and chemical etching techniques. The maximum voltage modulation is about 80 µV for the YBCO dc SQUID with an inductance of 70 pH, and intrinsic energy sensitivity is 740 h (h: Planck’s constant) at 4.2 K. Furthermore, the SQUID was operated in flux-locked loop. The minimum flux noise in the flux-locked SQUID is 1.5×10-5φ0/√Hz in the white noise region at 4.2 K. The experiments suggest that the current-phase relationship of a micrometer-long YBCO bridge may be sinusoidal.

KW - Mocvd

KW - Thin film bridge

KW - Ybco dc SQUID

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JO - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes

JF - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes

IS - 10 A

ER -

YBCO DC SQUID of MOCVD thin film bridge

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