Transformation of a vortex lattice and an inclusion in superconductors

1992 ◽  
Vol 275 ◽  
Author(s):  
Shinya Tokuono ◽  
Shoji Tanaka ◽  
Hidetoshi Fukuyama
Keyword(s):  
Interaction Potential ◽  
Vortex Lattice ◽  
Cylindrical Shape ◽  
Single Vortex ◽  
London Equation

ABSTRACTInteraction between vortices and inhomogeneity in superconductors is studied. As a typical example, we investigated the case of a single vortex and some vortices near an inclusion of the cylindrical shape and derived the interaction potential for the vortices as a function of the distance by use of the solution of London equation.

Single vortex core recording in a magnetic vortex lattice

2014 ◽  
Vol 115 (6) ◽  
pp. 063906 ◽  
Author(s):  
D. Mitin ◽  
D. Nissen ◽  
P. Schädlich ◽  
S. S. P. K. Arekapudi ◽  
M. Albrecht
Keyword(s):  
Vortex Core ◽  
Vortex Lattice ◽  
Magnetic Vortex ◽  
Single Vortex

scholarly journals Symmetry and disorder of the vitreous vortex lattice in overdopedBaFe2−xCoxAs2: Indication for strong single-vortex pinning

2010 ◽  
Vol 81 (1) ◽  
Author(s):  
D. S. Inosov ◽  
T. Shapoval ◽  
V. Neu ◽  
U. Wolff ◽  
J. S. White ◽  
...  
Keyword(s):  
Vortex Lattice ◽  
Vortex Pinning ◽  
Single Vortex

Structures of single vortex and vortex lattice in ad-wave superconductor

1996 ◽  
Vol 53 (6) ◽  
pp. R2991-R2994 ◽  
Author(s):  
Ji-Hai Xu ◽  
Yong Ren ◽  
Chin-Sen Ting
Keyword(s):  
Vortex Lattice ◽  
Single Vortex

Numerical Calculation of Interaction Between the Ferromagnetic Dots and Vortices

2003 ◽  
Vol 17 (18n20) ◽  
pp. 3392-3395
Author(s):  
Bo Cheng ◽  
Tony Ragsdale ◽  
W. J. Yeh
Keyword(s):  
Thin Film ◽  
Vortex Lattice ◽  
Matching Condition ◽  
Pinning Force ◽  
Two Dimensional ◽  
Attraction Force ◽  
Ybco Thin Film ◽  
London Equation ◽  
Magnetic Dots ◽  
Magnetic Dot

Enhancing the pinning force in high-Tc superconductors can be achieved by externally introduced periodic magnetic dots. We have numerically calculated the interaction between the magnetic dot and the vortex in high-Tc superconductors. The London equation is used to generate two-dimensional vortex lattice. In the matching condition, we calculate the attraction force between the magnetic dots and vortices at various conditions. It is found that the magnitude of the pinning from the dots is compatible with the intrinsic pinning force of YBCO thin film materials.

SUPERCONDUCTIVITY WITHOUT COOPER'S PAIRING

1999 ◽  
Vol 13 (29n31) ◽  
pp. 3434-3439
Author(s):  
J. D. FAN ◽  
Y. M. MALOZOVSKY
Keyword(s):  
Magnetic Flux ◽  
Interaction Potential ◽  
Geometric Phase ◽  
Josephson Effect ◽  
Bcs Theory ◽  
Natural Consequence ◽  
Second Quantization ◽  
Flux Quantization ◽  
London Equation ◽  
Bcs Hamiltonian

In terms of the geometric phase — Berry's phase, the authors have shown that the factor 2e appearing in the magnetic flux quantization in a bored cylindrical superconductor is a natural consequence of both London equation and gauge invariance. The same conclusion is also true for the Josephson effect. Thus, the factor 2e has nothing to do with electron (Cooper's) pairing. Moreover, the BCS Hamiltonian can be easily derived from the general formalism of the Hamiltonian of fermions in second quantization without invoking the concept of Cooper's pairing. It has been shown that in terms of a reinterpretation of the interaction potential in the BCS Hamiltonian, results from the BCS theory remain valid for conventional superconductors.

STUDY OF PINNING BEHAVIOR OF VORTEX LATTICE IN Bi1.6Pb0.3W0.1Sr2Ca2Cu3Oy SUPERCONDUCTING SYSTEM

1993 ◽  
Vol 07 (15) ◽  
pp. 999-1011 ◽  
Author(s):  
G. NARSINGA RAO ◽  
D. SURESH BABU ◽  
P. MOLINIE ◽  
M. GANNE
Keyword(s):  
Activation Energy ◽  
Single Phase ◽  
Vortex Lattice ◽  
Magnetic Phase ◽  
Magnetic Phase Diagram ◽  
Nominal Composition ◽  
Single Vortex ◽  
Pinning Centers ◽  
Temperature Range ◽  
Ceramic Samples

We report characterization and detailed magnetization study in fields up to 2 T in the temperature range between 5 and 80 K of Bi 1.6 Pb 0.3 W 0.1 Sr 2 Ca 2 Cu 3 O y (nominal composition pellets). XRD, field-cooled magnetization measurements, and electrical resistance studies showed that the sample consists of a single phase high-Tc (Bi-2223) superconductor in addition to CaWO y-type impurity. An empirical magnetic phase diagram of the superconducting system has been derived. We determined a H*(T) line where Jc becomes zero. In the region with nonzero critical current density, vortex lattice exhibits mainly two types of pinning behaviours, single vortex and collective pinning behaviour, in different field and temperature range. In addition, the temperature dependence of Jc showed an evidence of two types of pinning centres. In low temperatures (<40 K), the pinning centers with low values of activation energy are active whereas in high temperatures (≥40 K), the pinning centers with larger activation energy are active. These results are compared with those of Job & Rosenberg1 on Bi-2223 ceramic samples.

GINZBURG–LANDAU THEORY OF A d-WAVE SUPERCONDUCTOR WITH MASS ANISOTROPY — PAIRING SYMMETRY AND VORTEX STRUCTURES

1996 ◽  
Vol 10 (22) ◽  
pp. 2699-2721 ◽  
Author(s):  
JI-HAI XU ◽  
YONG REN ◽  
C. S. TING
Keyword(s):  
Magnetic Field ◽  
Vortex Lattice ◽  
Landau Theory ◽  
Mass Parameter ◽  
Vortex Structures ◽  
Pairing Symmetry ◽  
Single Vortex ◽  
Ginzburg Landau ◽  
D Wave ◽  
Good Agreement

YBa 2 Cu 3 O 7 (YBCO) exhibits a large anisotropy between the a (or y) and b (or x) axes in the CuO2 planes. This anisotropy can be modeled by introducing an anisotropic mass parameter λ = mx /my. Assuming a d-wave pairing interaction together with a repulsive on-site Coulomb interaction, we developed a Ginzburg–Landau theory for a d-wave superconductor with mass anisotropy in the presence of a magnetic field. We show that the order parameter always has s + d symmetry. The vortex structures for λ = 1 and λ > 1 have been numerically studied. For high T c cuprates with tetragonal structure (λ = 1), the vortex shows a four-fold symmetry and the vortex lattice may have oblique or triangular structure depending on the strength of the applied magnetic field, temperature, and the other parameters. For YBCO we choose λ = 2, the single vortex has an elliptic shape, and the vortex lattice always shows an oblique structure. All these results are in good agreement with experimental measurements.

Generalized vortex lattice method for planar supersonic flow

AIAA Journal ◽  
1997 ◽  
Vol 35 ◽  
pp. 1230-1233
Author(s):  
Paulo A. O. Soviero ◽  
Hugo B. Resende
Keyword(s):  
Supersonic Flow ◽  
Vortex Lattice ◽  
Lattice Method ◽  
Vortex Lattice Method
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