A superstructure in single-crystal YBa2Cu3O7-δ

Kemin, Tan; Hu, Meisheng; Wang, Yening

doi:10.1088/0953-8984/1/6/002

Cited by 9 publications

(3 citation statements)

References 7 publications

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“…Finally, the introduction of Hf and Zr impurities leads to substitutional impurities, which contribute to the formation of additional pinning centers. These (due to the low coherence length in this HTSC) may also be sufficiently effective on point defects, including oxygen vacancies [21,22] and impurities [5,23]. Here, we investigate the influence of Hf impurities on the magnetoresistive characteristics of YBa 2 Cu 3 O 7−δ ceramics in the transition interval to the superconducting state.…”

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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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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“…Structural defects in the compounds of the 1-2-3 system. In pure YBa2Cu3O7-δ single crystals, depending on the oxygen deficiency and the synthesis technology, the following structural defects are observed: point defects such as oxygen vacancies that form in the CuO2 planes, planar defects of the (001) type, twin boundaries, dislocations, and the so-called 2√2x2 √2 structures [20] observed at oxygen deficiency δ = 6.8 -6.9.…”

mentioning

confidence: 99%

“…Plane defects are twinning planes, which are formed during the "tetra-ortho" transition and minimize the elastic energy of the crystal. Twin boundaries are planes with a tetragonal structure as a result of the presence of layers containing oxygen vacancies located along the twin boundary [20,21]. Electron microscopic studies have shown [18,19,21] that at the initial stage of the tetra-ortho transition, domain nuclei are formed, in which two families of coherent interfaces (110) and (110) are formed.…”

mentioning

confidence: 99%

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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X-ray superstructure determination of ordered oxygen and Cu-displacements in a single domain of YBa2Cu3O6.35

Zeiske

Hohlwein

Sonntag

et al. 1992

Z. Physik B - Condensed Matter

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A superstructure in single-crystal YBa₂Cu₃O_7-δ

Cited by 9 publications

References 7 publications

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

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

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

X-ray superstructure determination of ordered oxygen and Cu-displacements in a single domain of YBa2Cu3O6.35

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