The role of Cu-O bond length fluctuations in the high temperature superconductivity mechanism

Deutscher, G.

doi:10.1063/1.4726157

Cited by 22 publications

(17 citation statements)

References 19 publications

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“…Extensive researches by Llordés et al 63. and Deutscher64 have showed a similar result that the nanoscale strain present in ɛ zz map is responsible for a strong enhancement of pinning force for H // c . In the irradiated FST film, the nanoscale strain observed in ɛ xx map can lead to the extremely high F p,max and the shift of the F p,max to high field for H // ab .…”

Section: Resultsmentioning

confidence: 64%

A route for a strong increase of critical current in nanostrained iron-based superconductors

et al. 2016

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The critical temperature Tc and the critical current density Jc determine the limits to large-scale superconductor applications. Superconductivity emerges at Tc. The practical current-carrying capability, measured by Jc, is the ability of defects in superconductors to pin the magnetic vortices, and that may reduce Tc. Simultaneous increase of Tc and Jc in superconductors is desirable but very difficult to realize. Here we demonstrate a route to raise both Tc and Jc together in iron-based superconductors. By using low-energy proton irradiation, we create cascade defects in FeSe0.5Te0.5 films. Tc is enhanced due to the nanoscale compressive strain and proximity effect, whereas Jc is doubled under zero field at 4.2 K through strong vortex pinning by the cascade defects and surrounding nanoscale strain. At 12 K and above 15 T, one order of magnitude of Jc enhancement is achieved in both parallel and perpendicular magnetic fields to the film surface.

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Section: Resultsmentioning

confidence: 64%

A route for a strong increase of critical current in nanostrained iron-based superconductors

et al. 2016

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“…However, oxygenation at low temperatures would be interesting because one can further modify the oxygen content of the YBCO films. [73][74][75][76] To overcome the low temperature limitation in the oxygenation of functional oxides, it has been shown that silver can be used as a catalyst to enhance the rate of oxygen incorporation. The use of silver as a catalyst for selective oxidation processes is well-known in different fields, especially in the hydrocarbon industry.…”

Section: View Article Onlinementioning

confidence: 99%

Untangling surface oxygen exchange effects in YBa₂Cu₃O_6+xthin films by electrical conductivity relaxation

Cayado

Sánchez-Valdés

Stangl

et al. 2017

Phys. Chem. Chem. Phys.

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The kinetics of oxygen incorporation (in-diffusion process) and excorporation (out-diffusion process), in YBaCuO (YBCO) epitaxial thin films prepared using the chemical solution deposition (CSD) methodology by the trifluoroacetate route, was investigated by electrical conductivity relaxation measurements. We show that the oxygenation kinetics of YBCO films is limited by the surface exchange process of oxygen molecules prior to bulk diffusion into the films. The analysis of the temperature and oxygen partial pressure influence on the oxygenation kinetics has drawn a consistent picture of the oxygen surface exchange process enabling us to define the most likely rate determining step. We have also established a strategy to accelerate the oxygenation kinetics at low temperatures based on the catalytic influence of Ag coatings thus allowing us to decrease the oxygenation temperature in the YBCO thin films.

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“…The in-situ nanocomposite CSD approach has also been widely investigated in recent years and much progress has been made in controlling the nanostructure and in understanding their physical properties [31][32][33]. For instance, a thorough analysis of the correlation between nanostrain generated within the YBCO matrix and the pinning force, evidenced that a novel vortex pinning mechanism may become effective in high temperature superconductors (HTS), which is closely associated to local disruption of the superconducting order parameter by tensile strain [30,34]. On the other hand, the comprehension of the complex growth mechanisms, involving kinetic and thermodynamic effects, forced to use multi-step processing paths to achieve control of the separate nucleation and growth processes of the two crystalline phases forming the nanocomposite [31,32].…”

Section: Introductionmentioning

confidence: 99%

Epitaxial YBa₂Cu₃O_7−xnanocomposite thin films from colloidal solutions

Cayado

Keukeleere

Garzón

et al. 2015

Supercond. Sci. Technol.

111

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A methodology of general validity to prepare epitaxial nanocomposite films is reported based on the use of colloidal solutions containing different crystalline preformed oxide nanoparticles (ex-situ nanocomposites). The trifluoroacetate (TFA) metal-organic chemical solution deposition route is used with alcoholic solvents to grow epitaxial YBa 2 Cu 3 O 7 (YBCO) films. For that reason stabilizing oxide nanoparticles in polar solvents is a challenging goal. We have used scalable nanoparticle synthetic methodologies such as thermal and microwave-assisted solvothermal techniques to prepare CeO 2 and ZrO 2 nanoparticles. We show that stable and homogeneous colloidal solutions with these nanoparticles can be reached using benzyl alcohol, triethyleneglycol, nonanoic acid, trifluoroacetic acid or decanoic acid as protecting ligands, thereby allowing subsequent mixing with alcoholic TFA solutions. An elaborate YBCO film growth analysis on these nanocomposites allows the identification of the different relevant growth phenomena, e.g. nanoparticle pushing towards the film surface, nanoparticle reactivity, coarsening and nanoparticle accumulation at the substrate interface. Upon mitigation of these effects, YBCO nanocomposite films with high self-field critical currents (J c 3-4 MA/cm 2 at 77 K) were reached, indicating no current limitation effects associated to epitaxy perturbation, while smoothed magnetic field dependences of the critical currents at high magnetic fields and decreased effective anisotropic pinning behavior confirms the effectiveness of the novel developed approach to enhance vortex pinning. In conclusion, a novel low cost solution-derived route to high current nanocomposite superconducting films and coated conductors has been developed with very promising features.

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The role of Cu-O bond length fluctuations in the high temperature superconductivity mechanism

Cited by 22 publications

References 19 publications

A route for a strong increase of critical current in nanostrained iron-based superconductors

A route for a strong increase of critical current in nanostrained iron-based superconductors

Untangling surface oxygen exchange effects in YBa₂Cu₃O_6+xthin films by electrical conductivity relaxation

Epitaxial YBa₂Cu₃O_7−xnanocomposite thin films from colloidal solutions

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The role of Cu-O bond length fluctuations in the high temperature superconductivity mechanism

Cited by 22 publications

References 19 publications

A route for a strong increase of critical current in nanostrained iron-based superconductors

A route for a strong increase of critical current in nanostrained iron-based superconductors

Untangling surface oxygen exchange effects in YBa2Cu3O6+xthin films by electrical conductivity relaxation

Epitaxial YBa2Cu3O7−xnanocomposite thin films from colloidal solutions

Contact Info

Product

Resources

About

Untangling surface oxygen exchange effects in YBa₂Cu₃O_6+xthin films by electrical conductivity relaxation

Epitaxial YBa₂Cu₃O_7−xnanocomposite thin films from colloidal solutions