${\rm YBa}_{2}{\rm Cu}_{3}{\rm O}_{7-\delta}$ Films With ${\rm BaZrO}_{3}$ Inclusions for Strong-Pinning in Superconducting Films on Single Crystal Substrate

Galluzzi, V.; Augieri, A.; Ciontea, L.; Celentano, G.; Fabbri, F.; Gambardella, U.; Mancini, A.; Petrișor, T.; Pompeo, Nicola; Rufoloni, A.; Silva, E..; Vannozzi, Angelo

doi:10.1109/tasc.2007.900006

Cited by 33 publications

(30 citation statements)

References 8 publications

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“…It has been reported that BZO determines the growth of elongated defects in YBCO/BZO samples [1,2,10]. This has been directly confirmed in a sample from the same batch of those here studied by transverse TEM measurements [13].…”

Section: Methodssupporting

confidence: 77%

“…T c remained in the range 89.5 K -90.6 K, and rocking curves from X-ray ω scans, always with FWHM ∆θ < 0.2 • , showed even improved c-axis alignment with increasing BZO content [9]. More details and structural analysis can be found in previous publications [10,12]. Measurements in dc yielded critical current densities J c at 77 K consistently with weaker magnetic field dependence as BZO concentration was increased [6].…”

Section: Methodsmentioning

confidence: 67%

“…(001) SrTiO 3 (STO) substrates were used. Extensive details of the growth technique and checks of the good sample quality are given elsewhere [10,11]. We mention specifically that the addition of BZO particles in our range, from 2.5 mol.% to 7 mol.%, does not deteriorate significantly the sample quality.…”

Section: Methodsmentioning

confidence: 96%

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Effect of nanosize BaZrO₃inclusions on vortex parameters in YBa₂Cu₃O_7−x

Silva

Pompeo²,

Rogai³

et al. 2010

J. Phys.: Conf. Ser.

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Section: Methodssupporting

confidence: 77%

Section: Methodsmentioning

confidence: 67%

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Effect of nanosize BaZrO₃inclusions on vortex parameters in YBa₂Cu₃O_7−x

Silva

Pompeo²,

Rogai³

et al. 2010

J. Phys.: Conf. Ser.

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“…as extensively reported elsewhere. 6 Transverse TEM images showed columnar-like defects, approximately perpendicular to the film plane, 10 absent in pure YBCO films. The density of columns is consistent with an equivalent matching field of about 0.85 T. T c ' 90 K (zero dc resistance criterion) was consistently found in all samples, with zero-field J c ' 3.7 MA cm…”

Section: -7mentioning

confidence: 97%

Anisotropy and directional pinning in YBa2Cu3O7−x with BaZrO3 nanorods

Pompeo

Augieri

Torokhtii

et al. 2013

Applied Physics Letters

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Measurements of anisotropic transport properties (dc and high-frequency regime) of driven vortex matter in YBa2Cu3O7−x with elongated strong-pinning sites (c-axis aligned, self-assembled BaZrO3 nanorods) are used to demonstrate that the effective-mass angular scaling takes place only in intrinsic physical quantities (flux-flow resistivity), and not in pinning-related Labusch parameter and critical currents. Comparison of the dynamics at different time scales shows evidence for a transition of the vortex matter toward a Mott phase, driven by the presence of nanorods. The strong pinning in dc arises partially from a dynamic effect.

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“…Several films have been examined, and consistently yielded higher J c in a magnetic field, as a consequence of the c−axis correlated nature of the pinning mechanisms active in films with BZO inclusions. 8 Two films with 0% and 7% have been selected for the study at microwave frequencies. BZO inclusions did not determine significant changes of the transport properties in zero field.…”

mentioning

confidence: 99%

Strong reduction of field-dependent microwave surface resistance in YBa2Cu3O7−δ with submicrometric BaZrO3 inclusions

et al. 2007

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We observe a strong reduction of the field induced thin film surface resistance measured at high microwave frequency (ν =47.7 GHz) in YBa2Cu3O 7−δ thin films grown on SrTiO3 substrates, as a consequence of the introduction of sub-micrometric BaZrO3 particles. The field increase of the surface resistance is smaller by a factor of ∼3 in the film with BaZrO3 inclusions, while the zerofield properties are not much affected. Combining surface resistance and surface reactance data we conclude (a) that BaZrO3 inclusions determine very deep and steep pinning wells and (b) that the pinning changes nature with respect to the pure film.Increasing pinning of vortex lines is an essential achievement for useful applications of superconductors in general, and of cuprate superconductors in particular due to the wide range of the H − T phase diagram where vortices are free or nearly free to move. Columnar defects are best suited to this aim, 1 but the introduction of such defects requires rather sophisticated techniques which are not suitable for mass production. Recently it was shown 2 that inclusions of BaZrO 3 (BZO) particles of dimensions in the 10-1000 nm range could determine a significant improvement of the dc properties of YBa 2 Cu 3 O 7−δ (YBCO) thin films. In particular, the critical current density 2,3 could be raised up to values useful for large scale dc applications, and the irreversibility line could be shifted above 10 T at 77 K. 4 A major interest comes from the easy incorporation of such sub-µm particles directly into the targets used for film deposition, thus making feasible the mass growth of very low losses superconductors. Pinning of vortices at high frequencies is desirable not only for devices operating in dc magnetic fields, but also because power handling is limited by depinning of selfnucleated vortices. In fact, tailored profiles of columnar defects have been shown to largely extend the linear regime at low microwave frequencies. 5 However, when the operating frequency increases, the dissipation due to oscillating vortices becomes increasingly difficult to reduce: with increasing frequency the amplitude of the vortex oscillation decreases, and becomes so small that only interactions between single vortices and pinning centers determine the response. In this regime the steepness of the pinning wells affects the balance between the reactive (elastic) and resistive (viscous) response, and the depth affects the creep of vortices. Even columnar defects, when the driving current oscillates in the high microwave range, determine at most a reduction of the dissipation of only ∼15%, as seen from measurements at * corresponding author. e-mail: silva@fis.uniroma3.it ∼50 GHz, 6 while in some cases the microwave dissipation raised after heavy-ion irradiation. 7 It seems reasonable to state that, up to now, no known artificial pinning centers have shown a significant reduction of the dissipation at very high frequencies. Measuring the response at the high edge of the microwave spectrum is a very stringent test for ...

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${\rm YBa}_{2}{\rm Cu}_{3}{\rm O}_{7-\delta}$ Films With ${\rm BaZrO}_{3}$ Inclusions for Strong-Pinning in Superconducting Films on Single Crystal Substrate

Cited by 33 publications

References 8 publications

Effect of nanosize BaZrO₃inclusions on vortex parameters in YBa₂Cu₃O_7−x

Effect of nanosize BaZrO₃inclusions on vortex parameters in YBa₂Cu₃O_7−x

Anisotropy and directional pinning in YBa2Cu3O7−x with BaZrO3 nanorods

Strong reduction of field-dependent microwave surface resistance in YBa2Cu3O7−δ with submicrometric BaZrO3 inclusions

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${\rm YBa}_{2}{\rm Cu}_{3}{\rm O}_{7-\delta}$ Films With ${\rm BaZrO}_{3}$ Inclusions for Strong-Pinning in Superconducting Films on Single Crystal Substrate

Cited by 33 publications

References 8 publications

Effect of nanosize BaZrO3inclusions on vortex parameters in YBa2Cu3O7−x

Effect of nanosize BaZrO3inclusions on vortex parameters in YBa2Cu3O7−x

Anisotropy and directional pinning in YBa2Cu3O7−x with BaZrO3 nanorods

Strong reduction of field-dependent microwave surface resistance in YBa2Cu3O7−δ with submicrometric BaZrO3 inclusions

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Product

Resources

About

Effect of nanosize BaZrO₃inclusions on vortex parameters in YBa₂Cu₃O_7−x

Effect of nanosize BaZrO₃inclusions on vortex parameters in YBa₂Cu₃O_7−x