Vortex fluctuations in YBCO thin films: influence of weak magnetic fields

2004 ◽  
Author(s):  
Peter Svedlindh ◽  
Orjan Festin ◽  
Klas Gunnarsson ◽  
Fredrik Ronnung ◽  
Dag Winkler
Keyword(s):  
Thin Films ◽  
Magnetic Fields ◽  
Ybco Thin Films ◽  
Weak Magnetic Fields ◽  
Vortex Fluctuations

Asymmetric critical currents of Nb and YBCO thin films for the polarity of the transport current in parallel magnetic fields

1994 ◽  
Vol 235-240 ◽  
pp. 3095-3096
Author(s):  
F. Ichikawa ◽  
T. Nishizaki ◽  
K. Yamabe ◽  
Y. Yamasaki ◽  
T. Fukami ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetic Fields ◽  
Critical Currents ◽  
Transport Current ◽  
Ybco Thin Films ◽  
Parallel Magnetic Fields

VORTEX FLUCTUATIONS IN WEAK MAGNETIC FIELDS

2005 ◽  
Vol 05 (01) ◽  
pp. R1-R12
Author(s):  
PETER SVEDLINDH ◽  
ÖRJAN FESTIN ◽  
KLAS GUNNARSSON ◽  
FREDRIK RÖNNUNG ◽  
DAG WINKLER
Keyword(s):  
Magnetic Fields ◽  
Ac Susceptibility ◽  
Mean Field ◽  
Noise Spectrum ◽  
Zero Field ◽  
Weak Magnetic Fields ◽  
Flux Noise ◽  
Frequency Independent ◽  
Noise Measurements ◽  
Vortex Fluctuations

Flux-noise and ac susceptibility measurements have been performed on epitaxial films of YBa 2 Cu 3 O 7. The validity of the fluctuation-dissipation-theorem is verified by the proportionality between flux noise and ac susceptibility results. The nominal zero-field flux-noise spectrum (Sϕ(f)) can be characterized as follows: Below a temperature dependent frequency f0(T), the flux-noise spectrum is frequency independent. For frequencies f>f0(T), the flux-noise spectrum follows f-x, with x≈1.7-1.8. f0 decreases by 4 orders of magnitude in a temperature interval of ΔT≈0.5 K . Moreover, the flux-noise spectrum scales as fSϕ=g(f/f0(T)), where g(·) is a scaling function. The influence of weak perturbing magnetic fields was investigated. While the general characteristics of the flux-noise spectrum remain, the characteristic frequency f0 increases by 3-4 orders of magnitude increasing the field from zero to 1 Oe. Flux-noise measurements performed using a compensating field to reduce the residual field in the experimental setup reveal new features of the measured noise spectra. The flux-noise is dominated by thermally generated vortex-antivortex pair fluctuations at temperatures below the mean-field transition temperature, while with decreasing temperature there is a transition to vortex fluctuations being dominated by field generated vortices.

scholarly journals Surface Resistance of YBCO Thin Films under High DC Magnetic Fields

2006 ◽  
Vol 43 ◽  
pp. 551-555 ◽  
Author(s):  
S Ohshima ◽  
K Kitamura ◽  
Y Noguchi ◽  
N Sekiya ◽  
A Saito ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetic Fields ◽  
Surface Resistance ◽  
Ybco Thin Films

Angular dependence of E–J characteristics under high magnetic fields in YBCO thin films

2001 ◽  
Vol 357-360 ◽  
pp. 273-276 ◽  
Author(s):  
M. Inoue ◽  
T. Kiss ◽  
M. Kiuchi ◽  
M. Takeo ◽  
S. Awaji ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetic Fields ◽  
Angular Dependence ◽  
High Magnetic Fields ◽  
Ybco Thin Films

Microwave losses of YBCO thin films in high magnetic fields

1995 ◽  
Vol 5 (2) ◽  
pp. 1756-1759 ◽  
Author(s):  
I.S. Ghosh ◽  
L.F. Cohen ◽  
V. Fry ◽  
T. Tate ◽  
A.D. Caplin ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetic Fields ◽  
High Magnetic Fields ◽  
Ybco Thin Films ◽  
Microwave Losses

Current density dependence of the activation energy in Tl-2212 thin films at weak magnetic fields

1997 ◽  
Vol 273 (3-4) ◽  
pp. 281-288 ◽  
Author(s):  
L. Ammor ◽  
A. Smina ◽  
J.C. Soret ◽  
A. Ruyter ◽  
V. Ta Phuoc ◽  
...  
Keyword(s):  
Thin Films ◽  
Activation Energy ◽  
Magnetic Fields ◽  
Density Dependence ◽  
Current Density ◽  
Weak Magnetic Fields

Deep pinning centres in BiSrCaCuO thin films at weak magnetic fields

Cryogenics ◽  
1992 ◽  
Vol 32 (11) ◽  
pp. 1093-1097 ◽  
Author(s):  
G. Jung ◽  
B. Savo ◽  
A. Vecchione ◽  
C. Attanasio
Keyword(s):  
Thin Films ◽  
Magnetic Fields ◽  
Weak Magnetic Fields

STUDY OF THE PREPARATION OF HIGH Tc SUPERCONDUCTING YBCO THIN FILMS BY A PLASMA-ASSISTED MOCVD PROCESS

1989 ◽  
Vol 50 (C5) ◽  
pp. C5-149-C5-153
Author(s):  
DING-KUN PENG ◽  
GUANG-YAO MENG ◽  
CHUN-BAO CAO ◽  
CHUN-LIN WANG ◽  
QI FANG ◽  
...  
Keyword(s):  
Thin Films ◽  
High Tc ◽  
Ybco Thin Films
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