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Search Publications by: Leila R. Vale (Fed)

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Displaying 76 - 100 of 123

Coplanar Transmission Lines with Meandering Center Conductors in Y-Ba-Cu-O/Au Bilayers

December 31, 1999
Author(s)
C Weber, Ronald H. Ono, James Booth, Leila R. Vale, Samuel Benz, A. M. Klushin, H. Kohlstedt, C. Buchal, R. Semerad
We have investigated both conventional and meandering coplanar microwave transmission lines patterned in Y-Ba-Cu-O/Au bilayers on yttria-stablized zirconia and sapphire substrates. Within the meandering waveguides, the gentre conductor was deformed from a

Far-Infrared Transmittance and Reflectance of YBa 2 Cu 3 O 7-x Films on Si Substrates

December 31, 1999
Author(s)
A. R. Kumar, Nien F. Zhang, V. A. Boychev, D. B. Tanner, Leila R. Vale, David A. Rudman
The transmittance and reflectance of superconductive YBa 2Cu 3O 7-γ (YBCO) thin films deposited on Si substrates have been measured in the far-infrared frequency region from 10 to 100 cmu-1^ (wavelength from 1000 to 100 micro υ) at temperatures between 10

Large-Area YBa 2 Cu 3 O 7-x Bolometers on Si Substrates

December 31, 1999
Author(s)
Leila R. Vale, Ronald H. Ono, Donald G. McDonald, Robert J. Phelan
We have developed YBa 2Cu 3O 7-x (YBCO) thermometers for large-area (4 mm x 4 mm) electrical substitution bolometers. We passivated the YBCO with a thin Au layer and demonstrated a noise equivalent temperature of 4 nK Hz -1/2. We then used a resistor layer

Coplanar Transmission Lines with Meandering Center Conductors in Y-Ba-Cu-O/Au Bilayers

June 1, 1999
Author(s)
C Weber, Ronald H. Ono, James Booth, Leila R. Vale, Samuel Benz, A. M. Klushin, H. Kohlstedt, R. Semerad
We have investigated both conventional and meandering coplanar microwave transmission lines patterned in Y-Ba-Cu-O/Au bilayers on yttria-stablized zirconia and sapphire substrates. Within the meandering waveguides, the gentre conductor was deformed from a

Interactions Between Bicrystal Josephson Junctions in a Multilayer Structure

June 1, 1999
Author(s)
H. Q. Li, Ronald H. Ono, Leila R. Vale, David A. Rudman, Sy-Hwang Liou
We have fabricated and studied a variety of devices based on stacked Yba 2Cu 3O x bicrystal Josephson junctions in a multilayer structure. The proximity of the junctions in the two layers produces a large number of effects based on interactions between the

Large Area YBa 2 Cu 3 O 7-x Bolometers on Si Substrates

June 1, 1999
Author(s)
Leila R. Vale, Ronald H. Ono, Donald G. McDonald, Robert J. Phelan
We have developed YBa 2Cu 3O 7-x (YBCO) thermometers for large-area (4 mm x 4 mm) electrical substitution bolometers. We passivated the YBCO with a thin Au layer and demonstrated a noise equivalent temperature of 4 nK Hz -1/2. We then used a resistor layer

Long Term Stability of YBCO-Based Josephson Junctions

June 1, 1999
Author(s)
Leila R. Vale, Ronald H. Ono, J. Talvacchio, M. G. Forrester, B. D. Hunt, M. S. DiTorio, Ki Youl Yang, S. Yoshizumi
We report on a study of long term aging in three different types of Yba 2Cu 3O 7-x Josephson junctions. Junction aging will affect the choices made in integrating this technology with actual applications. The junction types used in this study are (a) Co

Passivation, Transition Width, and Noise for YBCO Bolometers on Silicon

June 1, 1999
Author(s)
Donald G. McDonald, Robert J. Phelan, Leila R. Vale, Ronald H. Ono, David A. Rudman
We are developing Yba 2Cu 3O 7-x (YBCO) thermometers for large area bolometers that include a heater for calibration by the electrical substitution of power. Because YBCO on buffered Si is under mechanical stress and must be very thin to avoid cracking, we

Role of Oxygen Pressure during Deposition on the Microwave Properties of YBCO Films

June 1, 1999
Author(s)
David A. Rudman, F. J. Stork, James Booth, J. Y. Juang, Leila R. Vale, G. J. Beatty, C. I. Williams, James A. Beall, Ronald H. Ono, S. B. Qadri, M. S. Osofsky, E. F. Skelton, John H. Claassen, G. Gibson, J. L. MacManus-Driscoll, N. Malde, L. F. Cohen
We have studied the effect of oxygen pressure (PO 2) during pulsed laser deposition on the properties of YBCO films, with particular attention to the low power microwave surface resistance R s.

Simultaneous Optimization of Linear and Nonlinear Microwave Response of YBCO Films

June 1, 1999
Author(s)
James Booth, James A. Beall, David A. Rudman, Leila R. Vale, Ronald H. Ono, Christopher L. Holloway, S. B. Qadri, M. S. Osofsky, E. F. Skelton, J. H. Claasen, G. Gibson, J. L. MacManus-Driscoll, N. Malde, L. F. Cohen
We present results of a systematic study of the effect of film deposition temperture on both the linear and nonlinear response of super-conducting Yba 2Cu 3O7-γ^ (YBCO) thin films and devices at microwave frequencies. Measurements of the unpatterned films

Microwave Power Handling in Engineered Yba 2 Cu 3 O^d6-d Grain Boundaries

October 12, 1998
Author(s)
Y. M. Habib, D. E. Oates, G. Dresselhaus, M. Dresselhaus, Leila R. Vale, Ronald H. Ono
Microwave-frequency (rf) power-dependence measurements performed on thin-film Yba 2Cu 3O^d7-δ grain boundaries engineered on sapphire bicrystal substrates with misorientation angles of θ=20, 50, 100, and 240 are presented. The data are compared to

Measurements and Modeling of the Microwave Impedance in High-T c Grain-Boundary Josephson Junctions: Fluxon Generation and RF Josephson-Vortex Dynamics

June 1, 1998
Author(s)
Y. M. Habib, C. J. Lehner, D. E. Oates, Leila R. Vale, Ronald H. Ono, G. Dresselhaus, M. Dresselhaus
Measurements and modeling of the microwave-frequency (rf) power dependence of the impedance in Y-Ba-Cu-O thin-film grain-boundary Josephson junctions (jj's) are presented. Microwave impedance measurements were performed using a stripline resonator with an

Active Cavity Radiometer Based on High-TC Superconductors

January 1, 1998
Author(s)
Joseph P. Rice, Raju V. Datla, Leila R. Vale, David A. Rudman, M L. Sing, D Robbes
To implement the detector-based radiometric scale in the new Medium Background infrared [MBIR] facility at the National Institute of Standards and Technology [NIST], we have developed an electrical substitution cavity radiometer that can be operated at