Controlling the natural strong pinning sites in laser ablated YBa2Cu3O7-δ thin films

Dam, B.; Huijbregtse, J.M.; Geest, R.C.F. van der; Klaassen, F.M.; Rector, J.H.; Elberse, R.; Griessen, R.

doi:10.1016/s0921-4534(00)01049-2

Cited by 7 publications

(4 citation statements)

References 4 publications

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“…6,13,18 To verify this, MO imaging was used to visualize and quantify the initial flux distribution of the samples. Figures 3͑a͒ and 3͑b͒ show respectively the flux penetration after the application of applied field, B a =45 mT, at 5 K in YBCO films deposited on an untreated control and on the same modified STO that was presented in Fig.…”

Section: Resultsmentioning

confidence: 99%

Enhancement of flux pinning and critical currents in YBa2Cu3O7−δ films by nanoscale iridium pretreatment of substrate surfaces

Aytuğ

Paranthaman

Gapud

et al. 2005

Journal of Applied Physics

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We have acquired positive results in a controlled study to investigate the effects of substrate surface modification on the growth-induced flux-pinning nanostructures in YBa2Cu3O7−δ (YBCO) films. Nanoscale iridium (Ir) particles were applied to single-crystal SrTiO3 substrate surfaces using dc-magnetron sputtering. Superconducting properties of YBCO films grown on the Ir-modified substrates, measured by transport and magneto-optical imaging, have shown substantial improvement in the critical current densities (Jc) at 77 K over those on untreated, control substrates. Results also show a nearly uniform enhancement of Jc over all orientations of magnetic field. Present results are found to be consistent with cross-sectional transmission electron microscopy investigations. Ultimately, the objective of this approach is to produce enhancements in the properties of coated conductors by a simple pretreatment of the substrate surface.

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Section: Resultsmentioning

confidence: 99%

Enhancement of flux pinning and critical currents in YBa2Cu3O7−δ films by nanoscale iridium pretreatment of substrate surfaces

Aytuğ

Paranthaman

Gapud

et al. 2005

Journal of Applied Physics

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“…This may be a threading dislocation, which originates from the island-YBCO film interface, as suggested by several researchers. 4,8,9) Using a wet etching technique in combination with AFM, 9) we found the average distance between linear defects to be $150 nm.…”

mentioning

confidence: 99%

Critical Current Control in YBa₂Cu₃O_7-δFilms Using Artificial Pinning Centers

Matsumoto

Horide

Ichinose

et al. 2005

Jpn. J. Appl. Phys.

119

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High-temperature superconductors can carry high non dissipative currents at low temperatures as long as quantized vortices are pinned. However, the currents in a magnetic field at liquid nitrogen temperature (77 K) are not sufficiently high for practical use due to the weak pinning. For the improvement of nondissipative currents in YBa2Cu3O7-δ films, linear defects that extended to the c-axis of the film were introduced using a novel nanostructure technology. We observed a marked enhancement of the nondissipative currents even at 77 K and high fields when the fields were applied close to the c-axis. This is a clear demonstration of enhanced pinning using artificially incorporated pinning centers.

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“…4) The incidence of edge and screw dislocations correlates with the incidence of nonstoichiometric nucleation sites and, at least over certain dislocation densities, not with the release of misfit strain or with the number of dislocations in the substrate [11]. The latter two may indeed induce the formation of dislocations in the film but the number so induced could only be a lower limit as other causes, such as the incidence of the aforementioned non-stoichiometric nucleation sites dominates.…”

Section: P-pomentioning

confidence: 98%

“…The latter two may indeed induce the formation of dislocations in the film but the number so induced could only be a lower limit as other causes, such as the incidence of the aforementioned non-stoichiometric nucleation sites dominates. It is concluded by Dam et al [11] that the dislocations are formed as a result of the merging of misaligned growth fronts, when overgrowing precipitates. 6) The incidence of 2D and 3D growth features is altered by the deposition conditions [10,11] which means that although underlying features can affect subsequent layers the extent to which they do so is moderated by the growth conditions .…”

Section: P-pomentioning

confidence: 99%

On the growth mechanisms of thin films produced by pulsed laser deposition

McKinnon

Ionescu

Shi

et al. 2002

AIP Conference Proceedings

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For more than ten years Pulsed Laser Deposition (PLD) has been used to produce Y\Ba2CU307-l5 (YBCO) thin films. Most groups have reported their capacity to produce films with roughly optimum characteristics. Unfortunately, the deposition parameters used by the individual groups vruy within broad limits [1][2][3][4][5]. Each group develops a similar but unique recipe of deposition parameters, which, combined with other system specific characteristics, optimises their film properties. TQe implication of this is that...!!1e set of parameters being reported is not the whole sto1)'. In this pager we put forward a set of generally accepted t'a~out the PLD ~ess and we list the neces@ implications of these facts. To account for the facts w~uggest _a model based uPon t~on of a collisionalla)!:er at the surface of the film and the selective retention of impinginK species.

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Controlling the natural strong pinning sites in laser ablated YBa2Cu3O7-δ thin films

Cited by 7 publications

References 4 publications

Enhancement of flux pinning and critical currents in YBa2Cu3O7−δ films by nanoscale iridium pretreatment of substrate surfaces

Enhancement of flux pinning and critical currents in YBa2Cu3O7−δ films by nanoscale iridium pretreatment of substrate surfaces

Critical Current Control in YBa₂Cu₃O_7-δFilms Using Artificial Pinning Centers

On the growth mechanisms of thin films produced by pulsed laser deposition

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Controlling the natural strong pinning sites in laser ablated YBa2Cu3O7-δ thin films

Cited by 7 publications

References 4 publications

Enhancement of flux pinning and critical currents in YBa2Cu3O7−δ films by nanoscale iridium pretreatment of substrate surfaces

Enhancement of flux pinning and critical currents in YBa2Cu3O7−δ films by nanoscale iridium pretreatment of substrate surfaces

Critical Current Control in YBa2Cu3O7-δFilms Using Artificial Pinning Centers

On the growth mechanisms of thin films produced by pulsed laser deposition

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Critical Current Control in YBa₂Cu₃O_7-δFilms Using Artificial Pinning Centers