The effect of the YBCO–PST composite composition on the superconducting carrier concentration determined by microwave studies under high pressure

Krupski, M.; Stankowski, J.; Przybył, S; Andrzejewski, B.; Kaczmarek, Agata; Hilczer, B.; Marfaing, J.; Caranoni, C.

doi:10.1016/s0921-4534(99)00299-3

Cited by 4 publications

(2 citation statements)

References 25 publications

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“…5. The little disparity between the present results and earlier microwave measurements of T, [13] may be due to • sample ageing. On the other hand, AC method is sensitive to the interior whereas microwave absorption is sensitive to the surface of the grains, mostly influenced by interphase reactions.…”

Section: Resultscontrasting

confidence: 88%

Magnetic Properties of YBCO-PST Composites

et al. 2000

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The magnetic properties of granular superconductor-insulator composites were investigated. The composites were random composition of the YBa2 Cu3 O 7-δ (YBCO) high-temperature superconductor and Pb(Sc0.sTa0.5)O3 (PST) ferroelectric insulator. The composites exhibited lower superconducting volume ratio than the YBCO content. For samples with YBCO content low enough no global (the whole sample) and local (separated grains) superconductivity was observed. The observed decay of the superconductivity, lowering of the critical temperature, and the increase in number of paramagnetic centres as PST content increases are explained assuming reaction among YBCO and PST phases and possible formation of an additional ones, which did not exist in the initial powders.

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Section: Resultscontrasting

confidence: 88%

Magnetic Properties of YBCO-PST Composites

et al. 2000

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“…If T* = Tc, then the pressure coefficient is negative and Tc decreases by pressure, as in "classical" superconductors. This dependence was confirmed experimentally in the case of the YBCO compound [74], for which a positive and negative pressure coefficient of Tc was observed. Fig.…”

Section: This Dependence Correctly Describessupporting

confidence: 64%

Structural and electroresistive properties of layered compounds based on the 1-2-3 HTSC system and transition metal dichalcogenides under extreme external influences (review)

2020

The Journal of v. N. Karazin Kharkiv National University, Series "Physics"

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The problem of the influence of extreme external influences (high pressure, sharp temperature drops, structural relaxation, and strong magnetic fields) on various mechanisms of electric transport of HTSC compounds Re1Ba2Cu3O7-δ (Re = Y or another rare-earth ion) and dichalcogenides of transition metals are considered. The features of the crystal structure and the effect of structural defects of various morphologies on the electrical conductivity of these compounds in the normal, pseudogap, and superconducting states are discussed. A review of the experimental data obtained in the study of the effect of high hydrostatic pressure and other extreme effects on various mechanisms of electric transport of Re1Ba2Cu3O7-δ compounds of various compositions and transition metal dichalcogenides of various technological backgrounds is carried out. Various theoretical models devoted to the effect of high pressure on the electrical conductivity of HTSC compounds of the 1-2-3 system and transition metal dichalcogenides are discussed, and a comprehensive comparative analysis of their magnetoresistive characteristics under extreme external influences is performed. In particular, it was shown, that the relatively weak effect of pressure on the Tc value of optimally doped samples can be explained within the framework of a model assuming the presence of a Van Hove singularity in the spectrum of charge carriers which is characteristic of strongly coupled lattices. This is confirmed by the observation similar features of the behavior of the baric derivatives dTc/dP depending on the change composition in NbSe2 single crystals, which also belong to systems of two-dimensional lattices and have a similar anisotropy parameter. Nevertheless, it is still possible to formulate a number of questions that have not yet found a final experimental and theoretical solution. Namely, what is the role of the crystal lattice and structural defects and, in particular, twinning planes? What is the reason for the broadening of the resistive transitions of HTSC compounds into the superconducting state under pressure, and what is the relationship between this broadening and charge transfer and the nature of the redistribution of the vacancy subsystem? What is the role of phase separation in the implementation of different modes of longitudinal and transverse transport? Obviously, more research, both experimental and theoretical, is needed to answer these questions.

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Study on the Pressure Effect in YBa2Cu3O x as a Function Oxygen Content x

Milić

2012

J Low Temp Phys

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The effect of the YBCO–PST composite composition on the superconducting carrier concentration determined by microwave studies under high pressure

Cited by 4 publications

References 25 publications

Magnetic Properties of YBCO-PST Composites

Magnetic Properties of YBCO-PST Composites

Structural and electroresistive properties of layered compounds based on the 1-2-3 HTSC system and transition metal dichalcogenides under extreme external influences (review)

Study on the Pressure Effect in YBa2Cu3O x as a Function Oxygen Content x

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