The transition from 2D-nucleation to spiral growth in pulsed laser deposited YBa2Cu3O7−δ films

Dam, B.; Rector, J.H.; Huijbregtse, J.M.; Griessen, R.

doi:10.1016/s0921-4534(97)01837-6

Cited by 19 publications

(11 citation statements)

References 24 publications

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“…12, 14 We do not find the spiral growth mechanism to be relevant to our samples-a comparison with the deposition conditions of Ref. 12 indicates that growth spirals are not to be expected.…”

Section: Methodsmentioning

confidence: 53%

“…YBa 2 Cu 3 O 7Ϫ␦ films typically form through twodimensional nucleation and island growth, 9,10 with lateral island sizes that increase with growth temperature and film thickness. 11,12 The significant thickness modulations ␦d related to the presence of the islands and the associated variations of the vortex line energy as a function of the position lead to pinning of vortices in the thinnest portions of the film. The maximum pinning force will be close to that needed to drive a single-vortex line out of such a trough.…”

Section: Introductionmentioning

confidence: 99%

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Strong pinning in high-temperature superconducting films

et al. 2002

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Detailed measurements of the critical current density j c of YBa 2 Cu 3 O 7Ϫ␦ films grown by pulsed laser deposition reveal the increase of j c as a function of film thickness. Both this thickness dependence and the field dependence of the critical current are consistently described using a generalization of the theory of strong pinning of Ovchinnikov and Ivlev ͓Phys. Rev. B 43, 8024 ͑1991͔͒. From the model, we deduce values of the defect density (10 21 m Ϫ3 ) and the elementary pinning force, which are in good agreement with the generally accepted values for Y 2 O 3 inclusions. In the absence of clear evidence that the critical current is determined by linear defects or modulations of the film thickness, our model provides an alternative explanation for the rather universal field dependence of the critical current density found in YBa 2 Cu 3 O 7Ϫ␦ films deposited by different methods.

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Section: Methodsmentioning

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Strong pinning in high-temperature superconducting films

et al. 2002

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“…3) 2D (mesa type) and 3D (spiral type) features exist [9,10], which means that the net result of the retention of impinging species is non random. The impingement itself, is random, therefore certain locations on the surface of the growing film are more likely than others to retain adatoms.…”

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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“…One of the implications of the extremely short coherence length in cuprates, typically a few angstrom, is that superconducting properties especially critical current density of these materials are sensitive to their underlying microstructure. A significant improvement in superconducting properties of both bulk and film forms of superconductors has been brought by several workers through understanding and control of their microstructural characteristics for Y and Bi based superconductors [4][5][6][7][8][9][10][11][12]. Among various kid of defects line defects such as screw dislocations, capable of pinning a vortex along a substantial part of its length, may extend the temperature and magnetic field range in which these high-T c cuprates may be utilized.…”

Section: Introductionmentioning

confidence: 99%