Formation of edge dislocations in thin epitaxial YBCO films

Svetchnikov, V. L.; Pan, V.M.; Træholt, Chresten; Zandbergen, H.W.

doi:10.1109/77.620831

Cited by 57 publications

(59 citation statements)

References 16 publications

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“…It is also consistent with the increase of the island density [best seen in Fig. 5(a,c)], which is directly proportional to the corresponding increase of the dislocation density 76 because dislocation formation predominantly occurs close to the boundary of islands 64,80 . The quantitative agreement between densities of dislocations and islands, as well as B * , J c (B a ) and J c (0) may be not easy to find 77 because while B * is determined by density of pinning centres in single vortex pinning regime, J c (0) is established by strength of individual pinning cites 28 .…”

Section: B Ybco Thin Filmssupporting

confidence: 74%

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: B Ybco Thin Filmssupporting

confidence: 74%

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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“…1͑b͔͒ caused by low angle grain boundaries, in accordance with earlier TEM data. 20 The sharp peaks observed in the films on STO, on the other hand, are not compatible with low angle grain boundaries. For the magneto-optical ͑MO͒ microscopy similar samples were patterned to 100 m wide stripes using photolithographic etching.…”

Section: Methodsmentioning

confidence: 92%

“…1͑b͔͒ seen as widening of the peaks in direction. This is a sign of low angle grain boundaries which probably form around the growth islands, 20 which is not the case in films on STO. YBCO films on MgO also usually contain grains which are turned 45°in the a / b-plane.…”

Section: A Pinning In Undoped Ybco Filmsmentioning

confidence: 99%

“…25 The sizes of these dislocations is 0.3-0.5 nm. 20 On the other hand, doping YBCO films with BZO leads to 5-10 nm wide BZO rods to be similarly positioned in the film. 4 Changing the doping level does not change the size of the rods, only the density of the rods.…”

Section: Pinning By Columnar Defectsmentioning

confidence: 99%

“…Approximate size for the dislocation core r 0 was taken from Ref. 20 and the M cd and cd were fitted. It can be seen from Table I that the main difference between the -and n-films is the distance between the dislocations in the films, which is in perfect agreement with earlier observation of lattice stiffness measured with XRD.…”

Section: A Pinning In Undoped Ybco Filmsmentioning

confidence: 99%

See 2 more Smart Citations

Modeling flux pinning in thin undoped and BaZrO3-doped YBCO films

Paturi

Irjala

Huhtinen

et al. 2009

Journal of Applied Physics

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A simple model based on distributions of twin boundaries, dislocations, and BaZrO 3 nanorods is presented to describe the J c properties of undoped and BaZrO 3 ͑BZO͒-doped YBa 2 Cu 3 O x thin films. The model accurately describes the shape of J c ͑B , T͒ curves of the films, when the pinning site distributions are taken from distributions of twin spacings and BZO nanorods from transmission electron microscope images. Thus, assuming that the model can be used for prediction of the J c properties, we conclude that for enhancement of undoped films more crystalline defects are needed and for doped films a dopant that would create slightly larger rods would be optimal.

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Vortex Pinning and J c In High-T c Superconductors: Advance from Understanding Toward Some Practical Issues

Pan¹

1999

Physics and Materials Science of Vortex States, Flux Pinning and Dynamics

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Formation of edge dislocations in thin epitaxial YBCO films

Cited by 57 publications

References 16 publications

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

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

Modeling flux pinning in thin undoped and BaZrO3-doped YBCO films

Vortex Pinning and J c In High-T c Superconductors: Advance from Understanding Toward Some Practical Issues

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