Intrinsic anisotropy versus effective pinning anisotropy in 
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 thin films and nanocomposites

Bartolomé, Elena; Vallès, Ferran; Palau, Anna; Rouco, V.; Pompeo, Nicola; Balakirev, Fedor; Maiorov, B.; Civale, L.; Puig, T.; Obradors, X.; Silva, E.

doi:10.1103/physrevb.100.054502

Cited by 16 publications

(20 citation statements)

References 46 publications

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“…We perform measurements on very different nanostructured YBCO thin films: pristine and nanostructured, with artificial pinning centres in the form of nanorods or nanoparticles. We exploit the scaling procedure of the free-fluxflow resistivity to obtain the anisotropy coefficient γ and we obtain, in all samples, γ= 5.3 ± 0.7, in agreement with the multi-technique investigation in [26], despite the very different defect anisotropy, covering here 1D (nanorods), 2D (twin planes) and 3D (nanoparticles) defects. The remarkably diverse pinning anisotropy is however evident in the depinning frequency.…”

Section: H Qsupporting

confidence: 80%

“…We focus here on three specific samples: CSD1 is a pristine YBCO sample, CSD2 is a 6%-added Ba 2 YTaO 6 (BYTO) film and CSD3 is a 12%-added BaHfO 3 (BHO) film grown by a flash heating method [47]. A detailed description of all kinds of CSD films here examined can be found elsewhere [26,48]. In all CSD nanostructured films 3D defects were present.…”

Section: Experimental Setup and Samplesmentioning

confidence: 99%

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Intrinsic anisotropy and pinning anisotropy in nanostructured YBa₂Cu₃O_7−δ from microwave measurements

Pompeo

Alimenti

Torokhtii

et al. 2020

Supercond. Sci. Technol.

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Anisotropy is an intrinsic factor that dictates the magnetic properties of YBa 2 Cu 3 O 7−δ , thus with great impact for many applications. Artificial pinning centres are often introduced in an attempt to mitigate its effect, resulting in less anisotropic electrical and magnetic properties. However, the nanoengineering of the superconductor makes the quantification of the anisotropy itself uncertain: the intrinsic anisotropy due to the layered structure, quantified by the anisotropy factor γ, mixes up with the additional anisotropy due to pinning. As a consequence, there is no consensus on the experimental anisotropy factor γ that can result in YBa 2 Cu 3 O 7−δ when directional (twin planes, nanorods) or isotropic defects are present. We present here measurements of the magnetic field and angular dependent surface impedance in very different nanostructured YBa 2 Cu 3 O 7−δ films, grown by chemical route and by pulsed laser deposition, with different kind of defects (nanorods, twin planes, nanoparticles). We show that the surface impedance measurements are able to disentangle the intrinsic anisotropy from the directional pinning anisotropy, thanks to the possibility to extract the true anisotropic flux-flow resistivity and by correctly exploiting the angular scaling. We find in all films that the intrinsic anisotropy γ = 5.3 ± 0.7. By contrast, the pinning anisotropy determines a much complex, feature-rich and nonuniversal, sampledependent angular landscape.

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Section: H Qsupporting

confidence: 80%

Section: Experimental Setup and Samplesmentioning

confidence: 99%

Intrinsic anisotropy and pinning anisotropy in nanostructured YBa₂Cu₃O_7−δ from microwave measurements

Pompeo

Alimenti

Torokhtii

et al. 2020

Supercond. Sci. Technol.

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“…5 b. is extracted from electrical measurements of the flux flow resistivity up to 9 T as described in 68 – 70 . We observe only a small variation of , while the Hall number changes by more than a factor 4.…”

Section: Resultsmentioning

confidence: 99%

Ultra-high critical current densities of superconducting YBa2Cu3O7-δ thin films in the overdoped state

Stangl

Palau

Deutscher

et al. 2021

Sci Rep

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The functional properties of cuprates are strongly determined by the doping state and carrier density. We present an oxygen doping study of YBa2Cu3O7-δ (YBCO) thin films from underdoped to overdoped state, correlating the measured charge carrier density, $${n}_{\mathrm{H}}$$ n H , the hole doping, p, and the critical current density, $${J}_{c}$$ J c . Our results show experimental demonstration of strong increase of $${J}_{c}$$ J c with $${n}_{\mathrm{H}}$$ n H , up to Quantum Critical Point (QCP), due to an increase of the superconducting condensation energy. The ultra-high $${J}_{c}$$ J c achieved, 90 MA cm−2 at 5 K corresponds to about a fifth of the depairing current, i.e. a value among the highest ever reported in YBCO films. The overdoped regime is confirmed by a sudden increase of $${n}_{\mathrm{H}}$$ n H , associated to the reconstruction of the Fermi-surface at the QCP. Overdoping YBCO opens a promising route to extend the current carrying capabilities of rare-earth barium copper oxide (REBCO) coated conductors for applications.

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“…To be able to exclude that a major contribution arises from changes in 𝜉 0 , we have analysed 𝜉 0 for several samples spanning a broad doping range, as shown in Figure 5(b). 𝜉 0 is extracted from electrical measurements of the flux flow resistivity up to 9 T as described in [54][55][56] . We observe only a small variation of 𝜉 0 , while the Hall number changes by more than a factor 4.…”

Section: Superconducting Properties Of Ybco Films: Correlation With D...mentioning

confidence: 99%

Ultra-high Critical Current Densities of Superconducting YBa2Cu3O7-d thin Films in the Overdoped State

Stangl

Palau

Deutscher

et al. 2020

Preprint

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Doping is one of the most relevant paths to tune the functionality of cuprates, it determines carrier density and the overall physical properties of these superconducting materials. We present an oxygen doping study of YBa2Cu3O7-d (YBCO) thin films from underdoped to overdoped state, correlating the measured charge carrier density, nH, the hole doping, p, and the critical current density, Jc. Our results show experimental demonstration of a linear correlation between Jc and nH, up to Quantum Critical Point (QCP), due to an increase of the superconducting condensation energy. The ultra-high Jc achieved, 90 MA cm-2 at 5 K corresponds to a third of the depairing current, i.e. a value 60 % higher than ever reported in YBCO films. The overdoped regime is confirmed by a sudden increase of nH, associated to the reconstruction of the Fermi-surface at the QCP. Overdoping YBCO opens a promising route to extend the current carrying capabilities of REBCO coated conductors for applications.

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Intrinsic anisotropy versus effective pinning anisotropy in YBa2Cu3O7 thin films and nanocomposites

Cited by 16 publications

References 46 publications

Intrinsic anisotropy and pinning anisotropy in nanostructured YBa₂Cu₃O_7−δ from microwave measurements

Intrinsic anisotropy and pinning anisotropy in nanostructured YBa₂Cu₃O_7−δ from microwave measurements

Ultra-high critical current densities of superconducting YBa2Cu3O7-δ thin films in the overdoped state

Ultra-high Critical Current Densities of Superconducting YBa2Cu3O7-d thin Films in the Overdoped State

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Intrinsic anisotropy versus effective pinning anisotropy in YBa2Cu3O7 thin films and nanocomposites

Cited by 16 publications

References 46 publications

Intrinsic anisotropy and pinning anisotropy in nanostructured YBa2Cu3O7−δ from microwave measurements

Intrinsic anisotropy and pinning anisotropy in nanostructured YBa2Cu3O7−δ from microwave measurements

Ultra-high critical current densities of superconducting YBa2Cu3O7-δ thin films in the overdoped state

Ultra-high Critical Current Densities of Superconducting YBa2Cu3O7-d thin Films in the Overdoped State

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Intrinsic anisotropy and pinning anisotropy in nanostructured YBa₂Cu₃O_7−δ from microwave measurements

Intrinsic anisotropy and pinning anisotropy in nanostructured YBa₂Cu₃O_7−δ from microwave measurements