scholarly journals Microwave Response of Nanostructured High-Tc Superconductor Thin Films

2019 ◽  
Vol 64 (10) ◽  
pp. 969
Author(s):  
P. A. Borisenko ◽  
A. O. Pokusinskii ◽  
A. L. Kasatkin
Keyword(s):  
Surface Resistance ◽  
Dielectric Material ◽  
Structural Defects ◽  
Microwave Response ◽  
Microwave Surface Resistance ◽  
High Tc ◽  
Microwave Frequencies ◽  
High Tc Superconductor ◽  
Superconductor Thin Films ◽  
Abrikosov Vortices

A model for the microwave response of a nanostructured high-Tc superconductor (HTS) film, with implanted nanoparticles and nanorods of a dielectric material or point-like and columnar irradiation defects with a nano-sized cross-section is developed. In this case, the microwave surface resistance Rs(T,H,ω) is calculated both for the Meissner and mixed states of a superconductor film in an applied dc magnetic field. The obtained results indicate that the implantation of dielectric nanoparticles or point-like radiation defects can significantly improve superconductor characteristics at microwave frequencies. Namely, these nano-sized structural defects can decrease the surface resistance in the Meissner state and eliminate the oscillations of Abrikosov vortices and the related microwave energy losses, thus decreasing the contribution of Abrikosov vortices to the Rs value in the mixed state of a HTS film.

Peak-effect, a new phenomenon observed at microwave frequencies in high Tc superconductor thin films

2002 ◽  
Vol 382 (4) ◽  
pp. 386-394
Author(s):  
A.R Bhangale ◽  
T Banerjee ◽  
P Raychaudhuri ◽  
S.P Pai ◽  
J John ◽  
...  
Keyword(s):  
Thin Films ◽  
Peak Effect ◽  
High Tc ◽  
Microwave Frequencies ◽  
High Tc Superconductor ◽  
Superconductor Thin Films

Role of twins in peak effect phenomenon observed at microwave frequencies in high Tc superconductor thin films

2004 ◽  
Vol 405 (1) ◽  
pp. 14-24 ◽  
Author(s):  
Tamalika Banerjee ◽  
V.C. Bagwe ◽  
J. John ◽  
S.P. Pai ◽  
K. Ganesh Kumara ◽  
...  
Keyword(s):  
Thin Films ◽  
Peak Effect ◽  
High Tc ◽  
Microwave Frequencies ◽  
High Tc Superconductor ◽  
Superconductor Thin Films

Peak effect at microwave frequencies in swift heavy ion irradiated YBa2Cu3O7-δthin films - investigation of vortex dynamics

2001 ◽  
Vol 689 ◽  
Author(s):  
Tamalika Banerjee ◽  
A. R. Bhangale ◽  
P. Raychaudhuri ◽  
D. Kanjilal ◽  
R. Pinto
Keyword(s):  
Vortex Dynamics ◽  
Surface Resistance ◽  
Flux Line ◽  
Heavy Ion ◽  
Peak Effect ◽  
Microwave Surface Resistance ◽  
Line Lattice ◽  
Microwave Frequencies ◽  
Columnar Defects ◽  
Pronounced Peak

ABSTRACTThe vortex dynamics at microwave frequencies in YBa2Cu3O7-δ(YBCO) films has been studied. We observe a peak in the microwave surface resistance Rs vs. T (temperature) plots at 4.88 GHz in some films in magnetic fields (upto 0.8 T) whereas a few films do not show a pronounced peak in their surface resistance. This is associated with the ‘peak-effect’ phenomenon and reflects the order-disorder transformation of the flux-line lattice near the transition temperature. Introduction of artificial pinning centers like columnar defects as a result of irradiation with 200 MeV Ag ion leads to the suppression of the peak in films exhibiting the ‘peak-effect’. Interestingly, a peak is seen to develop in those films that initially did not show a peak in the surface resistance before irradiation. These results and the dynamics of the vortices at microwave frequencies for the unirradiated and irradiated films will be discussed.

Pulsed excimer laser depositon of high Tc superconductor thin films on Si with and without oxide barrier

1990 ◽  
Author(s):  
R. D. Vispute ◽  
S. T. Bendre ◽  
R. R. Viswanathan ◽  
S. M. Chaudhari ◽  
S. M. Kanetkar ◽  
...  
Keyword(s):  
Thin Films ◽  
Excimer Laser ◽  
High Tc ◽  
High Tc Superconductor ◽  
Oxide Barrier ◽  
Superconductor Thin Films

scholarly journals Magnetic field dependence of Josephson photoresponse in high-Tc superconductor thin films

1994 ◽  
Vol 89 (8) ◽  
pp. 705-708 ◽  
Author(s):  
Gi. Schneider ◽  
P.G. Huggard ◽  
T.P. O'Brien ◽  
W. Blau ◽  
W. Prettl
Keyword(s):  
Magnetic Field ◽  
Thin Films ◽  
Field Dependence ◽  
Magnetic Field Dependence ◽  
High Tc ◽  
High Tc Superconductor ◽  
Superconductor Thin Films

Dielectric properties of Ln(Mg1/2Ti1/2)O3 as substrates for high-Tc superconductor thin films

1999 ◽  
Vol 14 (6) ◽  
pp. 2484-2487 ◽  
Author(s):  
Seo-Yong Cho ◽  
Chang-Hun Kim ◽  
Dong-Wan Kim ◽  
Kug Sun Hong ◽  
Jong-Hee Kim
Keyword(s):  
Thin Film ◽  
Dielectric Constant ◽  
Room Temperature ◽  
Ybco Thin Film ◽  
X Ray Diffraction ◽  
High Tc ◽  
X Ray ◽  
High Tc Superconductor ◽  
Tan Δ ◽  
Superconductor Thin Films

Ln(Mg1/2Ti1/2)O3 (Ln = Dy, La, Nd, Pr, Sm, Y) compositions have been prepared, and their pertinent properties for use as thin film substrates for YBa2Cu3Ox (YBCO) were measured. X-ray diffraction shows that Ln(Mg1/2Ti1/2)O3 compositions have noncubic symmetry and the GdFeO3-type structure. Dielectric constant measurements revealed values between 22 and 27, which are larger than those of the LnAlO3 family. Quality factor (=1/ tan δ) of the ceramic specimens measured at room temperature was larger than 3000 at 10 GHz. Among the compounds, La(Mg1/2Ti1/2)O3 exhibited the highest dielectric constant and the lowest dielectric loss. Chemical reaction was observed between Ln(Mg1/2Ti1/2)O3 (Ln = Dy, Sm, Y) and YBCO after annealing a 1 : 1 mixture at 950 °C. Considering dielectric and physical properties, La(Mg1/2Ti1/2)O3 and Sm(Mg1/2Ti1/2)O3 were determined to be suitable substrates for YBCO thin film used in microwave applications.

Preparation of high Tc superconductor thin films of YBaCuO on crystalline Garnet substrates

1991 ◽  
Vol 77 (3) ◽  
pp. 217-219 ◽  
Author(s):  
P. Mukhopadhyay ◽  
S. Gorwadkar ◽  
S.B. Ogale ◽  
R.D. Vispute
Keyword(s):  
Thin Films ◽  
High Tc ◽  
High Tc Superconductor ◽  
Superconductor Thin Films
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