Influence of Ag-doping and thickness on superconducting properties of YBa2Cu3O7 films

Pysarenko, Serhiy; Pan, Alexey V.; Dou, Shi Xue

doi:10.1016/j.physc.2007.04.175

Cited by 6 publications

(7 citation statements)

References 9 publications

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“…The films where annealed in oxygen atmosphere at 400 • C for one hour after deposition for oxygenation. The thin films measured in this work are of optimal thickness d p 300 nm thick 5,6,33 , measured by Dektak profiler. The critical temperature was T c 90.0 ± 0.5 K for films deposited with 5 Hz and 8 Hz frequencies and T c 91.5 ± 0.5 K for 1 Hz deposited film, measured by DC magnetic measurements in PPMS at B a = 2.5 mT.…”

Section: A Pld Of Ybco and Fept Thin Filmsmentioning

confidence: 99%

“…The YBCO PLD films of the optimal thickness with the highest J c (B a ) are usually associated with rather advanced island structure 61-63 with pronounced topology and rather high surface roughness 6,33 (unless special techniques are employed to reduce it 33,35 ). The developed structure and its corresponding topography hinder the study of the island growth and structure.…”

Section: B Ybco Thin Filmsmentioning

confidence: 99%

“…For physical vapour deposition (PVD) technologies, this control is conventionally achieved by manipulating interdependent parameters, such as temperature, atmosphere, flux of material, resultant film thickness [1][2][3][4][5][6] and laser frequency [6][7][8][9][10] . In particular, the laser frequency for pulsed-based deposition (PLD) influences the film structure in many different ways, whose mechanisms can be contentious and not easily understood [7][8][9][10][11] .…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, a critical thickness for the optimal YBCO performance exists 5,6,33,34 . In thicker films, the surface becomes rough and their properties degrade, unless a multilayered structure is introduced 35 .…”

Section: Introductionmentioning

confidence: 99%

“…In thinner films, the integral capabilities of the films are reduced. The optimal thickness, defined at the maximum of the critical current density (J c ) as the function of the film thickness 5,33 , is usually obtained at the deposition stage with all YBCO islands coalesced 5,6,34 . In this work, it is shown that the island density and the island growth kinetics can be effectively varied by changing deposition conditions (in particular, laser frequency), thus the optimal thickness can be adjusted at will.…”

Section: Introductionmentioning

confidence: 99%

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Significant tunability of thin film functionalities enabled by manipulating magnetic and structural nano-domains

Golovchanskiy

Pan

Fedoseev

et al. 2014

Applied Surface Science

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The influence of laser frequency on the structure and physical properties of thin films grown by pulsed laser deposition has been studied. Different types of thin films, hard ferromagnetic FePt L10 and quasi-single crystal superconducting YBa2Cu3O7 (YBCO), have been used for demonstration of the effect. Significant structural modifications have been obtained for the films with similar thicknesses. These modifications are shown to dramatically control their corresponding properties, providing an instrumental ability for tuning the practical characteristics of the films by changing the laser frequency of their deposition. In particular, 20-fold increase of coercive field and modification of demagnetization mechanism are obtained for FePt films by varying the frequency from 1 Hz to 6 Hz. Over a similar frequency range, a strong dependence on the laser frequency is discovered for the YBCO films for the critical current density behavior as a function of the applied magnetic field [ Jc(Ba)] with the unexpected reversal of Jc(Ba) curves with temperature. The mechanisms of structure modifications and corresponding property variations are proposed. The influence of laser frequency on the structure and physical properties of thin films grown by pulsed laser deposition has been studied. Different types of thin films, hard ferromagnetic FePt L10 and quasi-single crystal superconducting YBa2Cu3O7 (YBCO), have been used for demonstration of the effect. Significant structural modifications have been obtained for the films with similar thicknesses. These modifications are shown to dramatically control their corresponding properties, providing an instrumental ability for tuning the practical characteristics of the films by changing the laser frequency of their deposition. In particular, 20-fold increase of coercive field and modification of demagnetization mechanism are obtained for FePt films by varying the frequency from 1 Hz to 6 Hz. Over a similar frequency range, a strong dependence on the laser frequency is discovered for the YBCO films for the critical current density behaviour as a function of the applied magnetic field [Jc(Ba)] with the unexpected reversal of Jc(Ba) curves with temperature. The mechanisms of structure modifications and corresponding property variations are proposed.

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Section: A Pld Of Ybco and Fept Thin Filmsmentioning

confidence: 99%