scholarly journals Emergence ofh/e-period oscillations in the critical temperature of small superconducting rings threaded by magnetic flux

2008 ◽  
Vol 77 (22) ◽  
Author(s):  
Tzu-Chieh Wei ◽  
Paul M. Goldbart
Keyword(s):  
Critical Temperature ◽  
Magnetic Flux ◽  
Superconducting Rings

Features of vortex pinning and magnetic flux creep in epitaxial thin films of high-Tc superconductor YBa2Cu3O7−δ near the critical temperature

2006 ◽  
Vol 32 (8) ◽  
pp. 832-837 ◽  
Author(s):  
M. P. Chornomorets ◽  
D. G. Kovalchuk ◽  
S. M. Ryabchenko ◽  
A. V. Semenov ◽  
E. A. Pashitskii
Keyword(s):  
Thin Films ◽  
Critical Temperature ◽  
Magnetic Flux ◽  
Vortex Pinning ◽  
Flux Creep ◽  
Epitaxial Thin Films ◽  
High Tc ◽  
High Tc Superconductor

Periodic oscillations of the critical temperature versus the applied magnetic flux in a four-terminal SQUID

1997 ◽  
Vol 239 (3-4) ◽  
pp. 216-222 ◽  
Author(s):  
B.J. Vleeming ◽  
M.S.P. Andriesse ◽  
A.Maassen van den Brink ◽  
H. Dekker ◽  
R. de Bruyn Ouboter
Keyword(s):  
Critical Temperature ◽  
Magnetic Flux ◽  
Periodic Oscillations

ASYMMETRIC DC-SQUIDS: MAGNETIC AND NOISE PROPERTIES

2000 ◽  
Vol 14 (25n27) ◽  
pp. 3062-3067
Author(s):  
G. TESTA ◽  
S. PAGANO ◽  
E. SARNELLI ◽  
C. R. CALIDONNA ◽  
M. RUSSO ◽  
...  
Keyword(s):  
Critical Temperature ◽  
Transfer Function ◽  
Magnetic Flux ◽  
High Performance ◽  
Thermal Noise ◽  
Bias Current ◽  
Device Performance ◽  
Noise Effects ◽  
Normal Resistance ◽  
High Performance Computer

SQUID configurations with an asymmetry in both the critical current and the normal resistance of the two Josephson junctions have been numerically analyzed. The analysis has been carried out on a high performance computer, by choosing parameters typical of low critical temperature SQUIDs. In particular the dependence of both the magnetic flux noise S Φ and the flux to voltage transfer function V Φ on the bias current and the normalized SQUID inductance β have been investigated. Thermal noise effects, including contributions of both junction and damping resistance have been introduced in the calculations. The results show that an increase of the asymmetry leads to higher V Φ and lower S Φ values. This suggests to use asymmetric dc-SQUIDs to improve the device performance for both small and large inductance values.

Dependence of the magnitude and direction of the persistent current on the magnetic flux in superconducting rings

2007 ◽  
Vol 105 (6) ◽  
pp. 1157-1173 ◽  
Author(s):  
V. L. Gurtovoi ◽  
S. V. Dubonos ◽  
A. V. Nikulov ◽  
N. N. Osipov ◽  
V. A. Tulin
Keyword(s):  
Magnetic Flux ◽  
Persistent Current ◽  
Superconducting Rings

Magnetic flux noise in superconducting rings and disks close to the superconducting transition

1997 ◽  
Vol 55 (14) ◽  
pp. 9098-9106 ◽  
Author(s):  
S. A. L. Foulds ◽  
J. Smithyman ◽  
G. F. Cox ◽  
C. M. Muirhead ◽  
R. G. Humphreys
Keyword(s):  
Magnetic Flux ◽  
Superconducting Transition ◽  
Flux Noise ◽  
Superconducting Rings

Magnetic flux creep in YBa2Cu3O7−δ high-Tc superconducting thin films near the critical temperature

2006 ◽  
Vol 32 (3) ◽  
pp. 205-213 ◽  
Author(s):  
M. P. Chernomorets ◽  
D. G. Kovalchuk ◽  
S. M. Ryabchenko ◽  
A. V. Semenov
Keyword(s):  
Thin Films ◽  
Critical Temperature ◽  
Magnetic Flux ◽  
Flux Creep ◽  
Superconducting Thin Films ◽  
High Tc

Theoretical and Experimental Results of DC and AC Magnetic Flux Transformation Using HTS Superconducting Closed Loop

2011 ◽  
Vol 354-355 ◽  
pp. 1265-1272
Author(s):  
Janos Kósa
Keyword(s):  
Magnetic Flux ◽  
Closed Loop ◽  
Experimental Results ◽  
Ybco Bulk ◽  
Superconducting Wire ◽  
Superconducting Loop ◽  
Superconducting Rings ◽  
Advanced Applications

This paper presents the results of my experiments that may open a new path for advanced applications by using continuous closed superconducting YBCO loops. I examined a novel arrangement of a perfectly closed superconducting loop made of HTS wire in DC and AC flux transformer. I designed a self-limiting transformer with this solution. At the same time I also tested the operation of the continuous YBCO loop developed with my own technology. In the first experiment I used YBCO superconducting rings made from a bulk. Later I used superconducting wire. I could carry out these experiments because earlier I had elaborated the machining of the YBCO bulk and wire.

scholarly journals Theoretical Derivation of Critical Current Density and Critical Magnetic Field Considering Many-Body Interactions of Magnetic Flux Quanta

2021 ◽  
Author(s):  
Shinichi Ishiguri
Keyword(s):  
Magnetic Field ◽  
Critical Temperature ◽  
Magnetic Flux ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Critical Magnetic Field ◽  
Many Body ◽  
Magnetic Flux Quantum ◽  
Many Body Interactions

To clarify the relationships among critical temperature, critical magnetic field, and critical current density, this paper describes many-body interactions of quantum magnetic fluxes (i.e., vortices) and calculates pinning-related critical current density. All calculations are analytically derived, without numerical or fitting methods. After calculating a magnetic flux quantum mass, we theoretically obtain the critical temperature in a many-body interaction scenario (which can be handled by our established method). We also derive the critical magnetic field and inherent critical current density at each critical temperature. Finally, we determine the pinning-related critical current density with self-fields. The relationships between the critical magnetic field and critical temperature, inherent critical current density and critical temperature, and pinning critical current density and self-magnetic field were consistent with experimental observations. From the critical current density and critical magnetic field, we clarified the magnetic field transition. It appears that a magnetic flux quantum collapses when the lattice of magnetic flux quanta melts. Our results, combined with our previously published papers, provide a comprehensive understanding of the transition points in high-Tc cuprates.

scholarly journals Surface Superconductivity of Vanadium

2021 ◽  
Vol 132 (3) ◽  
pp. 453-456
Author(s):  
I. N. Khlyustikov
Keyword(s):  
Critical Temperature ◽  
Magnetic Flux ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Persistent Currents ◽  
Surface Superconductivity

Abstract The critical temperature of the surface superconductivity in vanadium (Tcs) is found to be 0.04 K higher than the critical temperature of its volume superconductivity (Tcv). Surface superconductivity persistent currents can effectively trap a magnetic flux. The critical current density of the surface superconductivity is estimated at js = 5 × 106 A/cm2 at T = Tcv.

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