Intermodulation distortion and Josephson vortices in YBCO bicrystal grain boundaries

Daniel E. Oates; Hao Xin; Gene Dresselhaus; Mildred S. Dresselhaus

doi:10.1109/77.919646

Intermodulation distortion and Josephson vortices in YBCO bicrystal grain boundaries

Daniel E. Oates, Hao Xin, Gene Dresselhaus, Mildred S. Dresselhaus

Research output: Contribution to journal › Conference article › peer-review

7 Scopus citations

Abstract

The properties of grain boundaries at microwave-frequencies in the high-T_C materials are of interest for both practical applications and basic physics. We report the measurements of intermodulation distortion (IMD) in engineered grain boundaries in YBCO films fabricated on sapphire bicrystals with misorientation angles of 0, 2, 5, 7.5, 10 and 24°. The measurements indicate that low-angle grain boundaries are not the source of IMD in epitaxial films. We also report the microwave response of YBCO 24° bicrystal grain-boundaries to small dc magnetic fields, from 0 to 10 Oe. Peaks in the microwave loss as high as 5 times the baseline values at certain dc magnetic fields are observed. The losses result from individual Josephson vortices penetrating into the grain-boundary which is modeled as a long Josephson junction. Excellent quantitative agreement between the experimental data and the model has been obtained for the case of the increasing field.

Original language	English (US)
Pages (from-to)	2804-2807
Number of pages	4
Journal	IEEE Transactions on Applied Superconductivity
Volume	11
Issue number	1 III
DOIs	https://doi.org/10.1109/77.919646
State	Published - Mar 1 2001
Externally published	Yes
Event	2000 Applied Superconductivity Conference - Virginia Beach, VA, United States Duration: Sep 17 2000 → Sep 22 2000

Keywords

Grain boundaries
Nonlinear surface impedance
Vortex dynamics
Y-Ba-Cu-O thin films

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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title = "Intermodulation distortion and Josephson vortices in YBCO bicrystal grain boundaries",

abstract = "The properties of grain boundaries at microwave-frequencies in the high-TC materials are of interest for both practical applications and basic physics. We report the measurements of intermodulation distortion (IMD) in engineered grain boundaries in YBCO films fabricated on sapphire bicrystals with misorientation angles of 0, 2, 5, 7.5, 10 and 24°. The measurements indicate that low-angle grain boundaries are not the source of IMD in epitaxial films. We also report the microwave response of YBCO 24° bicrystal grain-boundaries to small dc magnetic fields, from 0 to 10 Oe. Peaks in the microwave loss as high as 5 times the baseline values at certain dc magnetic fields are observed. The losses result from individual Josephson vortices penetrating into the grain-boundary which is modeled as a long Josephson junction. Excellent quantitative agreement between the experimental data and the model has been obtained for the case of the increasing field.",

keywords = "Grain boundaries, Nonlinear surface impedance, Vortex dynamics, Y-Ba-Cu-O thin films",

author = "Oates, {Daniel E.} and Hao Xin and Gene Dresselhaus and Dresselhaus, {Mildred S.}",

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AU - Oates, Daniel E.

AU - Xin, Hao

AU - Dresselhaus, Gene

AU - Dresselhaus, Mildred S.

PY - 2001/3/1

Y1 - 2001/3/1

N2 - The properties of grain boundaries at microwave-frequencies in the high-TC materials are of interest for both practical applications and basic physics. We report the measurements of intermodulation distortion (IMD) in engineered grain boundaries in YBCO films fabricated on sapphire bicrystals with misorientation angles of 0, 2, 5, 7.5, 10 and 24°. The measurements indicate that low-angle grain boundaries are not the source of IMD in epitaxial films. We also report the microwave response of YBCO 24° bicrystal grain-boundaries to small dc magnetic fields, from 0 to 10 Oe. Peaks in the microwave loss as high as 5 times the baseline values at certain dc magnetic fields are observed. The losses result from individual Josephson vortices penetrating into the grain-boundary which is modeled as a long Josephson junction. Excellent quantitative agreement between the experimental data and the model has been obtained for the case of the increasing field.

AB - The properties of grain boundaries at microwave-frequencies in the high-TC materials are of interest for both practical applications and basic physics. We report the measurements of intermodulation distortion (IMD) in engineered grain boundaries in YBCO films fabricated on sapphire bicrystals with misorientation angles of 0, 2, 5, 7.5, 10 and 24°. The measurements indicate that low-angle grain boundaries are not the source of IMD in epitaxial films. We also report the microwave response of YBCO 24° bicrystal grain-boundaries to small dc magnetic fields, from 0 to 10 Oe. Peaks in the microwave loss as high as 5 times the baseline values at certain dc magnetic fields are observed. The losses result from individual Josephson vortices penetrating into the grain-boundary which is modeled as a long Josephson junction. Excellent quantitative agreement between the experimental data and the model has been obtained for the case of the increasing field.

KW - Grain boundaries

KW - Nonlinear surface impedance

KW - Vortex dynamics

KW - Y-Ba-Cu-O thin films

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