Transverse resistance of YBa2Cu3O7−δ single crystals

Вовк, Р. В.; Khadzhai, G. Ya.; Dobrovolskiy, Oleksandr V.; Nazyrov, Z. F.; Chroneos, Alexander

doi:10.1016/j.cap.2015.02.016

Cited by 4 publications

(1 citation statement)

References 44 publications

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“…All these processes have a significant impact on the physical properties of HTSC in the normal and in superconducting states. This is pronounced by the oxygen hypostoichiometric composition of the samples [47,48].…”

Section: Introductionmentioning

confidence: 94%

Modification by high pressure of fluctuation paraconductivity of underdoped HoBa2Cu3O7-δ single crystals

Kamchatnaya

Goulatis

Вовк

et al. 2016

J Mater Sci: Mater Electron

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In this work, we investigate the effect of high pressure on the conductivity in the basal plane of the high temperature super conducting (HTSC) single crystals HoBa 2 Cu 3 O 7-d . It is determined that the excess conductivity Dr(T) of the HoBa 2 Cu 3 O 7-d single crystals in the temperature interval near the critical temperature (T c ) is described within the framework of the Aslamazov-Larkin theoretical model. It is shown that the evolution of the transverse coherence length n c (0) in the case of application/ removal of high pressure is largely determined by the ''relaxation'' pressure effect during prolonged exposure of the sample under load at room temperature.

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Section: Introductionmentioning

confidence: 94%

Modification by high pressure of fluctuation paraconductivity of underdoped HoBa2Cu3O7-δ single crystals

Kamchatnaya

Goulatis

Вовк

et al. 2016

J Mater Sci: Mater Electron

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Role of twins in variations in the conductivity characteristics of single-crystal HoBa2Cu3O7-δ during reversible changes in hydrostatic pressure

Khadzhai

Nazyrov

Вовк

2016

Low Temperature Physics

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The in-plane electrical resistivity of single-crystal HoBa2Cu3O7-δ (Tc = 62–66 K) is studied at temperatures Tc–300 K under conditions such that the measurement current flows parallel to twins or at an angle of 45° to them during reversible changes in hydrostatic pressure. The variations in Tc, in the parameters of the Bloch-Grueneisen equations, and in the parameters of the Aslamasov-Larkin model for fluctuation conductivity are analyzed. Application of a pressure facilitates the formation of a second phase with lower Tc that shows up more clearly when the measurement current flows across the twinning plane. In this case, the transverse coherence length and the interval within which the fluctuation conductivity exists are smaller than in the first configuration. The relaxation of the parameters characterizing the scatting of charge carriers on phonons and defects is related to the redistribution of oxygen between the two phases.

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Quenching and room-temperature annealing effects on the conductivity of underdoped HoBa2Cu3O7−δ

et al. 2018

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The effects of quenching from 600[Formula: see text]C and subsequent room-temperature annealing on the basal-plane electrical resistivity of underdoped HoBa2Cu3O[Formula: see text] single crystals are investigated. Regions with different superconducting transition temperatures, [Formula: see text], have been revealed in the sample after quenching and attributed to a non-uniform distribution of the labile oxygen in the sample volume. Room-temperature annealing has been revealed to lead to an increase of [Formula: see text] of all regions and a decrease of their number, attributed to the coalescence of clusters of oxygen vacancies. The temperature dependence of the resistance in the normal state is characterized by a decrease of the residual resistivity and the phonon scattering coefficient.

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Transverse resistance of YBa2Cu3O7−δ single crystals

Cited by 4 publications

References 44 publications

Modification by high pressure of fluctuation paraconductivity of underdoped HoBa2Cu3O7-δ single crystals

Modification by high pressure of fluctuation paraconductivity of underdoped HoBa2Cu3O7-δ single crystals

Role of twins in variations in the conductivity characteristics of single-crystal HoBa2Cu3O7-δ during reversible changes in hydrostatic pressure

Quenching and room-temperature annealing effects on the conductivity of underdoped HoBa2Cu3O7−δ

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