Magnetic field modulation of critical currents in YBaCuO co-planar Josephson junctions using focused ion beam

1997 ◽  
Vol 7 (2) ◽  
pp. 2311-2314 ◽  
Author(s):  
Y. Soutome ◽  
Y. Okabe
Keyword(s):  
Magnetic Field ◽  
Josephson Junctions ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Critical Currents ◽  
Magnetic Field Modulation ◽  
Field Modulation

Evidence fordx2−y2Pairing from the Magnetic Field Modulation of YBa2Cu3O7-Pb Josephson Junctions

1995 ◽  
Vol 74 (5) ◽  
pp. 797-800 ◽  
Author(s):  
D. A. Wollman ◽  
D. J. Van Harlingen ◽  
J. Giapintzakis ◽  
D. M. Ginsberg
Keyword(s):  
Magnetic Field ◽  
Josephson Junctions ◽  
Magnetic Field Modulation ◽  
Field Modulation ◽  
The Magnetic Field

Temperature dependence and magnetic field modulation of critical currents in step-edge SNS YBCO/Au junctions

1995 ◽  
Vol 5 (2) ◽  
pp. 2969-2972 ◽  
Author(s):  
N. Missert ◽  
L.R. Vale ◽  
R.H. Ono ◽  
C.D. Reintsema ◽  
D.A. Rudman ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Temperature Dependence ◽  
Critical Currents ◽  
Step Edge ◽  
Magnetic Field Modulation ◽  
Field Modulation

PLANAR JOSEPHSON JUNCTIONS FABRICATED BY FOCUSED-ION BEAM

2001 ◽  
Vol 15 (24n25) ◽  
pp. 3359-3360 ◽  
Author(s):  
Hye-Won Seo ◽  
Quark Y. Chen ◽  
Chong Wang ◽  
Wei-Kan Chu ◽  
T. M. Chuang ◽  
...  
Keyword(s):  
Silicon Dioxide ◽  
Josephson Junctions ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Spot Size ◽  
Physical Significance ◽  
Fabrication Technique ◽  
Beam Spot ◽  
Beam Spot Size ◽  
Current Voltage

We have fabricated nano-scaled planar superconductor-insulator-superconductor Josephson junctions using focused ion beam (FIB) with beam spot size ~5 nm . To study the effectiveness of this fabrication technique and for the purpose of comparisons, a variety of samples have been made based on high temperature superconducting (HTS) YBa2Cu3O7-δ electrodes. The insulators are either vacuum or silicon dioxide. The samples showed current-voltage (IV) characteristics typical of a resistively shunted junction (RSJ). We will discuss various aspects of the processing methods and the physical significance of the junction characteristics.

scholarly journals Coherent emission from the stack of Josephson junctions with the non-uniform inductive interaction

2019 ◽  
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Gaussian Distribution ◽  
Josephson Junctions ◽  
Critical Currents ◽  
Collective Modes ◽  
Zero Field ◽  
Strong Emission ◽  
Inductive Interaction ◽  
Coherent Emission

During last decade, considerable efforts were made to achieve coherent emission from stacks of many Josephson junctions. It is known that strong emission from a junction in the presence of external magnetic field appears at the so-called Fiske steps in the IV-characteristic at voltages which correspond to frequencies of geometrical resonances. However, it is possible to obtain resonant steps in long junctions without external magnetic field. The periodical movement of fluxons is excited due to some disorder in the distribution of critical currents along junctions. The so-called zero-field steps are formed in the IV-curve due to the interaction of fluxons with oscillations of voltage at Josephson frequencies. We investigated numerically IV-characteristics and the dependence of the average square of ac voltage at the end of the stack of two long Josephson junctions on the average voltage. Junctions interacted inductively with each other. We introduced not only the Gaussian distribution of critical currents along junctions but also the Gaussian distribution of coefficients of the interaction between junctions (mutual inductances). Zero-field steps in the IV-characteristic were found at voltages which corresponded to frequencies of in-phase collective modes in the stack as well as to frequencies of uncoupled junctions. Zero-field steps appeared in the hysteretic region of the IV-curve. There appeared also jumps of voltage from the resistive branch to the zero-field step. We showed that there existed distributions of mutual inductances along junctions which provided jumps to voltages at which the average square of ac voltage at the end of the stack (which is proportional to power of emission) was larger than that for the stack with the uniform distribution of mutual inductances.

On NMR spin imaging by magnetic field modulation

1980 ◽  
Vol 22 (3) ◽  
pp. 257-271 ◽  
Author(s):  
L. F. Feiner ◽  
P. R. Locher
Keyword(s):  
Magnetic Field ◽  
Magnetic Field Modulation ◽  
Field Modulation
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