Mechanism of incongruent ablation of SrTiO3

Dam, B.; Rector, J.H.; Johansson, J.; Huijbregtse, J.M.; Groot, de H.L.F.

doi:10.1063/1.367106

Cited by 44 publications

(48 citation statements)

References 10 publications

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“…34 Similar investigations on STO thin films have also been made by Dam et al and reports that the nonstoichiometric ablation occurs from a SrTiO 3 target when fluence is below 1.3 J/cm 2 . 35 Recently Packwood et al prepared lithium maganite thin films by PLD. 36 The films are found to be non-stoichiometric and are attributed to dependence of ablation probability of a particular species upon laser fluence.…”

Section: Resultsmentioning

confidence: 99%

Transition from diamagnetic to ferromagnetic state in laser ablated nitrogen doped ZnO thin films

et al. 2015

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Transition from room temperature diamagnetic to ferromagnetic state in N doped ZnO (ZnO:N) films grown by pulsed laser deposition with tunable energy density has been identified. ZnO:N films deposited with moderate laser energy density of 2.5 J/cm2 are single phase and nearly defect free having N dopant substitution at O sites in ZnO lattice, exhibiting intrinsic ferromagnetism. When energy density reduces (<2.5 J/cm2), defects in ZnO:N film degrades ferromagnetism and exhibit diamagnetic phase when grown at energy density of 1.0 J/cm2. Growth kinetics, which in turn depends on laser energy density is playing important role in making transition from ferromagnetic to diamagnetic in ZnO:N films.

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Section: Resultsmentioning

confidence: 99%

Transition from diamagnetic to ferromagnetic state in laser ablated nitrogen doped ZnO thin films

et al. 2015

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“…A valuable premise to reduce possible sources of off-stoichiometry 19 and, eventually, impose a good level of reproducibility of the oxide thin films, is the understanding of the influence of the ablation process on the chemistry of the target surface. Indeed, depending upon the element-specific ablation thresholds and the density of the ceramic target itself, differential ablation processes can give rise to unexpected segregation onto the target surface.…”

Section: Growth From a Mixed-phases Targetmentioning

confidence: 99%

Reproducibility and off-stoichiometry issues in nickelate thin films grown by pulsed laser deposition

et al. 2017

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Rare-earth nickelates are strongly correlated oxides displaying a metal-to-insulator transition at a temperature tunable by the rare-earth ionic radius. In PrNiO 3 and NdNiO 3 , the transition is very sharp and shows an hysteretic behavior akin to a first-order transition. Both the temperature at which the transition occurs and the associated resistivity change are extremely sensitive to doping and therefore to offstoichiometry issues that may arise during thin film growth. Here we report that strong deviations in the transport properties of NdNiO 3 films can arise in films grown consecutively under nominally identical conditions by pulsed laser deposition; some samples show a well-developed transition with a resistivity change of up to five orders of magnitude while others are metallic down to low temperatures. Through a detailed analysis of in-situ X-ray photoelectron spectroscopy data, we relate this behavior to large levels of cationic off-stoichoimetry that also translate in changes in the Ni valence and bandwidth. Finally, we demonstrate that this lack of reproducibility can be remarkably alleviated by using single-phase NdNiO 3 targets.

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“…4,[8][9][10][11] Nonetheless, the physical mechanisms underlying this phenomenon has not yet been clarified up to now. In an early work, 12 the Ti deficiency of STO thin films grown at low laser fluences was attributed to a volume-diffusion-assisted preferential ablation process. However, the deviations from the target stoichiometry at higher laser fluence could not be explained within this model.…”

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confidence: 99%

Pulsed laser ablation of complex oxides: The role of congruent ablation and preferential scattering for the film stoichiometry

Wicklein

Sambri

Amoruso

et al. 2012

Applied Physics Letters

113

111

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By combining structural and chemical thin film analysis with detailed plume diagnostics and\ud modeling of the laser plume dynamics, we are able to elucidate the different physical mechanisms\ud determining the stoichiometry of the complex oxides model material SrTiO3 during pulsed laser\ud deposition. Deviations between thin film and target stoichiometry are basically a result of two\ud effects, namely, incongruent ablation and preferential scattering of lighter ablated species during\ud their motion towards the substrate in the O2 background gas. On the one hand, a progressive\ud preferential ablation of the Ti species with increasing laser fluence leads to a regime of Ti-rich thin\ud film growth at larger fluences. On the other hand, in the low laser fluence regime, a more effective\ud scattering of the lighter Ti plume species results in Sr rich films

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Mechanism of incongruent ablation of SrTiO3

Cited by 44 publications

References 10 publications

Transition from diamagnetic to ferromagnetic state in laser ablated nitrogen doped ZnO thin films

Transition from diamagnetic to ferromagnetic state in laser ablated nitrogen doped ZnO thin films

Reproducibility and off-stoichiometry issues in nickelate thin films grown by pulsed laser deposition

Pulsed laser ablation of complex oxides: The role of congruent ablation and preferential scattering for the film stoichiometry

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