Phase separation in oxygen deficient ΗοBa2Cu3O7-δ single crystals: effect of high pressure and twin boundaries

Вовк, Р. В.; Nazyrov, Z. F.; Obolenskii, M. A.; Goulatis, Ι. L.; Chroneos, Alexander; Simoes, V. M. Pinto

doi:10.1080/14786435.2011.552893

Cited by 62 publications

(48 citation statements)

References 20 publications

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“…The increase in the width of the resistive transition, suggests a significantly reduced degree of homogeneity of the samples [3,4]. Additionally, it is consistent with the step-like form, which is observed after aging, showing signs indicating the appearance of phase separation in their volume [4,14].…”

Section: Resultssupporting

confidence: 66%

“…The twin boundaries (TB), being extended planar defects, promote strengthening of pinning processes [12], which extend their range in obtaining high magnetic fields. At the same time, the presence of TB complicates the investigation of the resistance characteristics due to the difficulty of defining their contribution to the electrical conductivity in the HTSC compounds [4,10]. Previous studies on the impact of the aluminium on the electro-transport properties of YBa 2 Cu 3 O 7 are contradictory.…”

Section: Introductionmentioning

confidence: 94%

“…The ReBa 2 Cu 3 O 7-δ (Re=Y, Al) single crystals were grown in a gold crucible with the solutionmelting method, under small temperature gradient along the crucible [3,4,10]. As source After these measurements, the crystal was stored in a glass container until the re-measurements, which were carried out after 6 years.…”

Section: Experimental Methodologymentioning

confidence: 99%

“…A complete or partial substitution of yttrium with rare-earth elements, with the exception of praseodymium (praseodymium anomaly) that suppresses the superconducting parameters of the compound [2], slightly affects their physical characteristics in the normal and superconducting state [3,4]. The substitution of copper by calcium leads to a deterioration of their superconducting properties (see for example [5] and references therein).…”

Section: Introductionmentioning

confidence: 99%

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Effect of Long Aging on the Resistivity Properties of Aluminum Doped YBa2Cu3−y Al y O7−δ Single Crystals with a Given Twin Boundary Topology

Вовк¹,

Vovk²,

Goulatis³

et al. 2013

J Low Temp Phys

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We investigate the conducting properties in the basal ab-plane before and after a long time exposure in air atmosphere of aluminium doped YBa 2 Cu 3-y Al y O 7-δ single crystals. Prolonged exposure leads to an increase of the effective scattering centers of the normal carriers. The excess conductivity in a wide temperature range has exponential temperature dependence and near the critical temperature (T c ) can be adequately described within the Aslamazov-Larkin theoretical model. Nevertheless, the description of the excess conductivity through the relation Δ~(1-Т/Т*)exp(Δ* ab /T), can be interpreted in terms of the mean-field theory, where T* is the mean filed temperature of the superconducting transition and the temperature dependence of the pseudo-gap is satisfactorily described by the BEC-BCS crossover theory. It is determined that the prolonged exposure increases significantly the temperature range of the implementation of the pseudogap state, thus narrowing the linear section of the resistivity dependence  ab (Т).*E-mail: Ruslan.V.Vovk@univer.kharkov.ua 2

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Section: Resultssupporting

confidence: 66%

Section: Introductionmentioning

confidence: 94%

Section: Experimental Methodologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Long Aging on the Resistivity Properties of Aluminum Doped YBa2Cu3−y Al y O7−δ Single Crystals with a Given Twin Boundary Topology

Вовк¹,

Vovk²,

Goulatis³

et al. 2013

J Low Temp Phys

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“…As a result, the latter are still unchallenged regarding their application to obtain high magnetic fields. Concurrently, in recent years there is significant progress in improving the critical current density in various types of HTSC compounds, mainly due to the optimization of the composition and the morphology of the defect ensemble [5,[9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Effect of Hafnium Impurities on the Magnetoresistance of $$\hbox {YBa}_{2}\hbox {Cu}_{3}\hbox {O}_{7-\delta }$$ YBa 2 Cu 3 O 7 - δ

et al. 2016

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In the present study, we investigate the influence of the hafnium (Hf) impurities on the magnetoresistance of YBa 2 Cu 3 O 7−δ ceramic samples in the temperature interval of the transition to the superconducting state in constant magnetic field up to 12 T. The cause of the appearance of low-temperature "tails" (paracoherent transitions) on the resistive transitions, corresponding to different phase regimes of the vortex matter state is discussed. At temperatures higher than the critical temperature (T > T c ), the temperature dependence of the excess paraconductivity can be described within the Aslamazov-Larkin theoretical model of the fluctuation conductivity for layered superconductors.

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Electro-transport and structure of 1-2-3 HTSC single crystals with different plane defects topologies

Вовк¹,

Obolenskii²,

Nazyrov³

et al. 2011

J Mater Sci: Mater Electron

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In this work we study the structural and resistivity parameters of the 1-2-3 system HTSC single crystals by substituting yttrium to holmium and with a low (5%) aluminum doping. It was determined that in the case of nonstoichiometric samples, the structure of crystals, directly after the solution-melt growth, is close to tetragonal. In the process of additional oxygen saturation we observed a ferroelastic transition to orthorhombic phase, accompanied by the formation of a domain twin structure. The twin boundaries and the aluminum impurities are efficient scattering centers of normal carriers. At aluminum concentration y B 0.5 the tweed structure is not formed.

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Phase separation in oxygen deficient ΗοBa₂Cu₃O_7-δ single crystals: effect of high pressure and twin boundaries

Cited by 62 publications

References 20 publications

Effect of Long Aging on the Resistivity Properties of Aluminum Doped YBa2Cu3−y Al y O7−δ Single Crystals with a Given Twin Boundary Topology

Effect of Long Aging on the Resistivity Properties of Aluminum Doped YBa2Cu3−y Al y O7−δ Single Crystals with a Given Twin Boundary Topology

Effect of Hafnium Impurities on the Magnetoresistance of $$\hbox {YBa}_{2}\hbox {Cu}_{3}\hbox {O}_{7-\delta }$$ YBa 2 Cu 3 O 7 - δ

Electro-transport and structure of 1-2-3 HTSC single crystals with different plane defects topologies

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