Thin-Film Stabilization of Metastable Phases in the Sm1-xSrxCuOy System

Gupta, Amit; Mercey, B.; Hervieu, H.; Raveau, B.

doi:10.1021/cm00043a024

Cited by 12 publications

(6 citation statements)

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“…We used pulsed laser deposition (PLD) from two separate parent targets of La and Sr-based oxides that receive laser ablation pulses at arbitrary and electronically controlled relative rates (instead of using a single LS x CO target whose doping would determine the one of the film). This method was inspired by previous works [25][26][27][28][29][30][31] using PLD over separate targets to grow perovskite oxides, and to our knowledge this is the first time that it has been applied not only to LS x CO but also to systematically vary doping in a single-material HTSC. Using two parent oxide targets eases the obtainment of arbitrary dopings (no need to synthesize specific HTSC powders for each doping) and good final homogeneities (with a single HTSC target, the parent inhomogeneities compromise the film too).…”

Section: Introductionmentioning

confidence: 99%

Synthesis from separate oxide targets of high quality La_2−xSr_xCuO₄thin films and dependence with doping of their superconducting transition width

Cotón

Mercey

Mosqueira

et al. 2013

Supercond. Sci. Technol.

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A series of superconducting La 2−x Sr x CuO 4 thin films, with 0.09 x 0.22, is grown over (100)SrTiO 3 substrates by means of a novel pulsed laser deposition method devised to increase the homogeneity and control of doping. We employ two separate parent oxide targets that receive ablation shots at arbitrary computer-controlled relative rates, instead of the conventional procedure that uses a single target whose doping determines the one of the film. We characterize the films both through conventional techniques (XRD, SEM, AFM and EDX) and by measuring their superconducting transition with a high-sensitivity SQUID magnetometer. The latter allows one to determine not only their average critical temperatures Tc (x) but also their dispersions due to inhomogeneities, T c (x). For Tc (x) we obtain the conventional parabolic law centered at x = 0.16, plus a Gaussian depression near x = 1/8 with a Tc -height of about 5 K and x-width about 0.03. For T c (x) we obtain, for all the dopings, values among the lowest reported up to now for La 2−x Sr x CuO 4 . The T c (x) dependence can be explained in terms of the unavoidable randomness of the positioning of the Sr ions (the so-called intrinsic chemical inhomogeneity) and a separate residual T c -inhomogeneity contribution of the order of 0.5 K, this last associated with the samples' structural inhomogeneities and films' substrate.

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Section: Introductionmentioning

confidence: 99%

Synthesis from separate oxide targets of high quality La_2−xSr_xCuO₄thin films and dependence with doping of their superconducting transition width

Cotón

Mercey

Mosqueira

et al. 2013

Supercond. Sci. Technol.

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“…An important factor in the stabilization of particular structures and/or phases is the synthetic pathway. Pulsed laser deposition (PLD) of thin films has been used as an effective alternative to high-pressure or soft-chemical techniques for synthesizing metastable phases. − For example, metastable layered copper oxides, such as the AECuO 2 (AE = Ca, Sr, Ba) phases, − other copper-based perovskites, − and complex, superconducting oxycarbonates, , have been synthesized via PLD. Moreover, artificial structures and superlattices of these phases have been attained owing to the unique synthetic aspects of thin-film deposition. ,, Thin-film-deposition techniques are ideally suited to synthesizing materials whose metastable structure is similar to that of the substrate and/or has novel two-dimensional cationic order that is often impossible to achieve with either classical powder or high-pressure synthetic techniques. , …”

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confidence: 99%

Stabilization of YMnO₃ in a Perovskite Structure as a Thin Film

Salvador¹,

Doan²,

Mercey³

et al. 1998

Chem. Mater.

113

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Using pulsed laser deposition (PLD), metastable perovskite YMnO3 films were grown from a hexagonal YMnO3 target. The stabilization of the metastable phase is a result of the structural similarity between it and the perovskite substrates. X-ray and electron diffraction confirm the films' epitaxial nature but evince that the orientation and residual strains depend on the substrate. The implication of these findings is that PLD is a simple synthetic approach to stabilizing new, more complex, metastable perovskites.

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“…Because of the experimental complexity of successful by taking advantage of the flexibility of PLD and using a multi-target system, Gupta et al 55 were able to completely oxide-MBE deposition techniques, it is interesting to investigate other methods which allow for a comparable level of describe the phases in the Sm-Sr-Cu-O system as thin films. Desfeux et al56 deposited a cubic perovskite phase having the control over film stoichiometries and spatial arrangements.…”

Section: Applicability Of Various Thin Film Techniques To Newmentioning

confidence: 99%

Thin film deposition: a novel synthetic route to new materials

Mercey¹,

Salvador²,

Prellier³

et al. 1999

J. Mater. Chem.

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Thin-Film Stabilization of Metastable Phases in the Sm1-xSrxCuOy System

Cited by 12 publications

References 0 publications

Synthesis from separate oxide targets of high quality La_2−xSr_xCuO₄thin films and dependence with doping of their superconducting transition width

Synthesis from separate oxide targets of high quality La_2−xSr_xCuO₄thin films and dependence with doping of their superconducting transition width

Stabilization of YMnO₃ in a Perovskite Structure as a Thin Film

Thin film deposition: a novel synthetic route to new materials

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Thin-Film Stabilization of Metastable Phases in the Sm1-xSrxCuOy System

Cited by 12 publications

References 0 publications

Synthesis from separate oxide targets of high quality La2−xSrxCuO4thin films and dependence with doping of their superconducting transition width

Synthesis from separate oxide targets of high quality La2−xSrxCuO4thin films and dependence with doping of their superconducting transition width

Stabilization of YMnO3 in a Perovskite Structure as a Thin Film

Thin film deposition: a novel synthetic route to new materials

Contact Info

Product

Resources

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Synthesis from separate oxide targets of high quality La_2−xSr_xCuO₄thin films and dependence with doping of their superconducting transition width

Synthesis from separate oxide targets of high quality La_2−xSr_xCuO₄thin films and dependence with doping of their superconducting transition width

Stabilization of YMnO₃ in a Perovskite Structure as a Thin Film