Characteristics of YBa2Cu3Oy step-edge Josephson junctions on MgO substrate

L. C. Ku; H. M. Cho; J. H. Lu; S. Y. Wang; W. B. Jian; H. C. Yang; H. E. Horng

doi:10.1016/0921-4534(94)90513-4

Characteristics of YBa₂Cu₃O_y step-edge Josephson junctions on MgO substrate

L. C. Ku^*
, H. M. Cho
, J. H. Lu
, S. Y. Wang
, W. B. Jian
, H. C. Yang
, H. E. Horng

^*Corresponding author for this work

Undergraduate Program of Electro-Optical Engineering

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

13 Citations (Scopus)

Abstract

We fabricated and characterized YBa₂Cu₃O_y step-edge Josephson junctions and DC SQUID's on MgO (001) substrates. Sharp steps on MgO (001) were obtained by the techniques of photolithography and Ar-ion milling with step heights varying from 300 to 350 nm. The current-voltage (I-V) characteristic of the junction is consistent with the resistively shunted junction (RSJ) model. We obtained J_c=1.0×10⁵ A/cm² and I_cR_n=110 μV at 77 K. In addition to the conventional Shapiro steps resulting from the AC Josephson effect, half-integral steps were observed. The width of these half-integral steps was sensitive to the RF power and the magnetic field. DC SQUID's have been operated below 78 K and the observed voltage modulation agrees with the expected value.

Original language	English
Pages (from-to)	320-324
Number of pages	5
Journal	Physica C: Superconductivity and its Applications
Volume	229
Issue number	3-4
DOIs	https://doi.org/10.1016/0921-4534(94)90513-4
Publication status	Published - 1994 Aug 15

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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@article{9696ee2fa0f24cc39a502a42d8bb9fa8,

title = "Characteristics of YBa2Cu3Oy step-edge Josephson junctions on MgO substrate",

abstract = "We fabricated and characterized YBa2Cu3Oy step-edge Josephson junctions and DC SQUID's on MgO (001) substrates. Sharp steps on MgO (001) were obtained by the techniques of photolithography and Ar-ion milling with step heights varying from 300 to 350 nm. The current-voltage (I-V) characteristic of the junction is consistent with the resistively shunted junction (RSJ) model. We obtained Jc=1.0×105 A/cm2 and IcRn=110 μV at 77 K. In addition to the conventional Shapiro steps resulting from the AC Josephson effect, half-integral steps were observed. The width of these half-integral steps was sensitive to the RF power and the magnetic field. DC SQUID's have been operated below 78 K and the observed voltage modulation agrees with the expected value.",

author = "Ku, \{L. C.\} and Cho, \{H. M.\} and Lu, \{J. H.\} and Wang, \{S. Y.\} and Jian, \{W. B.\} and Yang, \{H. C.\} and Horng, \{H. E.\}",

note = "Funding Information: We thank the National Science Council of Taiwan for support (Grant No. NSC 83-021 2-M002-070).",

year = "1994",

month = aug,

day = "15",

doi = "10.1016/0921-4534(94)90513-4",

language = "English",

volume = "229",

pages = "320--324",

journal = "Physica C: Superconductivity and its Applications",

issn = "0921-4534",

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TY - JOUR

T1 - Characteristics of YBa2Cu3Oy step-edge Josephson junctions on MgO substrate

AU - Ku, L. C.

AU - Cho, H. M.

AU - Lu, J. H.

AU - Wang, S. Y.

AU - Jian, W. B.

AU - Yang, H. C.

AU - Horng, H. E.

N1 - Funding Information: We thank the National Science Council of Taiwan for support (Grant No. NSC 83-021 2-M002-070).

PY - 1994/8/15

Y1 - 1994/8/15

N2 - We fabricated and characterized YBa2Cu3Oy step-edge Josephson junctions and DC SQUID's on MgO (001) substrates. Sharp steps on MgO (001) were obtained by the techniques of photolithography and Ar-ion milling with step heights varying from 300 to 350 nm. The current-voltage (I-V) characteristic of the junction is consistent with the resistively shunted junction (RSJ) model. We obtained Jc=1.0×105 A/cm2 and IcRn=110 μV at 77 K. In addition to the conventional Shapiro steps resulting from the AC Josephson effect, half-integral steps were observed. The width of these half-integral steps was sensitive to the RF power and the magnetic field. DC SQUID's have been operated below 78 K and the observed voltage modulation agrees with the expected value.

AB - We fabricated and characterized YBa2Cu3Oy step-edge Josephson junctions and DC SQUID's on MgO (001) substrates. Sharp steps on MgO (001) were obtained by the techniques of photolithography and Ar-ion milling with step heights varying from 300 to 350 nm. The current-voltage (I-V) characteristic of the junction is consistent with the resistively shunted junction (RSJ) model. We obtained Jc=1.0×105 A/cm2 and IcRn=110 μV at 77 K. In addition to the conventional Shapiro steps resulting from the AC Josephson effect, half-integral steps were observed. The width of these half-integral steps was sensitive to the RF power and the magnetic field. DC SQUID's have been operated below 78 K and the observed voltage modulation agrees with the expected value.

UR - https://www.scopus.com/pages/publications/0028482504

UR - https://www.scopus.com/pages/publications/0028482504#tab=citedBy

U2 - 10.1016/0921-4534(94)90513-4

DO - 10.1016/0921-4534(94)90513-4

M3 - Article

AN - SCOPUS:0028482504

SN - 0921-4534

VL - 229

SP - 320

EP - 324

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

IS - 3-4

ER -

Characteristics of YBa₂Cu₃O_y step-edge Josephson junctions on MgO substrate

Abstract

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