Influence of La-doping of YBa/sub 2/Cu/sub 3/O/sub 7/ on transport properties of interface-engineered ramp-edge junctions

Heinsohn, J.-K.; Dittmann, Ralf W.; Contreras, J. Rodrı́guez; Scherbel, J.; Клушин, А.М.; Siegel, M.

doi:10.1109/77.919465

Cited by 9 publications

(13 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The values were obtained using the geometrical dimensions of the junctions. The obtained ratios are about the reported values for these types of the junctions with similar junction widths [13], [15]. As shown in the figure, the nonlinearity in the -curves became prominent as the junction widths increased to 8 m resulting in well above 4 [14].…”

Section: A -Characteristicsupporting

confidence: 77%

“…The obtained values for the and of our samples are close and slightly better than the typical reported values [11], [13], [16]. While the of the junctions made on one chip decreased as the decreased, a systematic change of the was not observed.…”

Section: Similarsupporting

confidence: 72%

“…3 indicate an almost uniform current distribution through the areas of the junctions. The dependence of of our 3 to 5 m wide junctions showed approximate short junction behavior down to liquid helium temperature lower than the reported values for similar type of the junctions [13], [18]. The 8 m wide junction showed a clear short junction characteristic at 35 K and above.…”

Section: B Magnetic Field Dependencecontrasting

confidence: 63%

“…The sheet resistance, , of the junctions at 7 K, ranged within about 48-95 n -cm increasing with decrease of . The hysteretic underdamped (nonzero Steward-McCumber parameter, ) behavior of the junctions increased as the temperature decreased below about 40 K, resulting in of about 2.3-2.5 at 7 K. The associated values of the of the junctions led to junction capacitances within the range of 5 to 8.5 F/cm which is about two times less than typical reported values [11]- [13]. As shown in Fig.…”

Section: A -Characteristicmentioning

confidence: 71%

See 3 more Smart Citations

Noise, junction characteristics, and magnetic field dependencies of bicrystal grain boundary junction Rf-SQUIDs

Fardmanesh

Schubert²,

Akram³

et al. 2003

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

Rf-SQUID's were made using designs for optimal performance at 77 K while avoiding large superconducting weak links across the substrate GB. Devices with low noise characteristics and junction field sensitivities proper for operation in environmental background magnetic fields were obtained. A nonsystematic spread of optimal working temperature of the SQUID's were also observed which is associated to the spread of the junction parameters caused by the defects at the GB of substrates.

show abstract

Section: A -Characteristicsupporting

confidence: 77%

Section: Similarsupporting

confidence: 72%

Section: B Magnetic Field Dependencecontrasting

confidence: 63%

Section: A -Characteristicmentioning

confidence: 71%

See 2 more Smart Citations

Noise, junction characteristics, and magnetic field dependencies of bicrystal grain boundary junction Rf-SQUIDs

Fardmanesh

Schubert²,

Akram³

et al. 2003

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

show abstract

“…2. The associated Steward McCumber parameter, [13], resulted in a junction capacitance of about 2 fF, below the expected typical reported values for Y-Ba-Cu-O GB JJs [14]- [16]. The relatively low capacitance and high values of our SEJs suggest effective junction areas much smaller than the "geometrical area" of the junctions [6], [9].…”

Section: Sej -Characteristics and Magnetic Field Dependencecontrasting

confidence: 63%

Junction characteristics and magnetic field dependencies of low noise step edge junction Rf-SQUIDs for unshielded applications

Fardmanesh

Schubert

Akram

et al. 2003

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

Step edge grain boundary (GB) junctions and rf-SQUIDs have been made using pulsed laser deposited Y-Ba-Cu-O films on crystalline LaAlO3 substrates. The steps were developed using various ion-beam etching processes resulting in sharp and ramp type step structures. Sharp step based GB junctions showed behavior of serial junctions with resistively shunted junction (RSJ) -like I-V characteristics. The ramped type step structures resulted in relatively high critical current, Ic, junctions and noisy SQUIDs. The sharp steps resulted in low noise rf-SQUIDs with a noise level below 140 fT/Hz1/2 down to few Hz at 77 K while measured with conventional tank circuits. The Ic of the junctions and hence the operating temperature range of the SQUIDs made using sharp steps was controlled by both the step height and the junction widths. The junction properties of the SQUIDs were also characterized showing RSJ-like characteristics and magnetic field sensitivities correlated to that of the SQUIDs. Two major low and high background magnetic field sensitivities have been observed for our step edge junctions and the SQUIDs made on sharp steps. High quality step edge junctions with low magnetic field sensitivities made on clean sharp steps resulted in low I/f noise rf-SQUIDs proper for applications in unshielded environment

show abstract

Current transport in interface-engineered high-Tc Josephson junctions

Yoshida

Katsuno

Inoue

et al. 2002

Physica C: Superconductivity

View full text Add to dashboard Cite

Influence of La-doping of YBa/sub 2/Cu/sub 3/O/sub 7/ on transport properties of interface-engineered ramp-edge junctions

Cited by 9 publications

References 14 publications

Noise, junction characteristics, and magnetic field dependencies of bicrystal grain boundary junction Rf-SQUIDs

Noise, junction characteristics, and magnetic field dependencies of bicrystal grain boundary junction Rf-SQUIDs

Junction characteristics and magnetic field dependencies of low noise step edge junction Rf-SQUIDs for unshielded applications

Current transport in interface-engineered high-Tc Josephson junctions

Contact Info

Product

Resources

About