The influence of several impurities on the microstructure and superconducting properties of YBa2Cu3O7−x single crystals

Fischer, K.; Fruchter, L.; Hergt, R.; Linzen, D.; Bruchlos, G.; Chebotayev, N.M.

doi:10.1016/0167-577x(91)90091-j

Cited by 7 publications

(3 citation statements)

References 9 publications

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“…The crystals used in this study were grown by a modified CuO-BaO self-flux method [3,4] and annealed in pure oxygen. The reduced oxygen content is obtained by annealing the oxygen-rich samples in air at 560 "C for different times.…”

Section: Methodsmentioning

confidence: 99%

A Numerical Analysis of the Thermal Conductivity in the ab‐Plane of YBa₂Cu₃O_7‐δ

Eversmann

Kopte

Dörr

et al. 1994

Physica Status Solidi (b)

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Measurements of the thermal conductivity in the ab-plane of different YBa,Cu,O, -, single crystals in the temperature range 2 K < T < 120 K are presented. The crystals differ in oxygen content and density of defects like point defects and twin boundaries. A numerical analysis of the phonon thermal conductivity is described. It allows to separate the scattering rates for phonons due to the scattering mechanisms being effective in YBa,Cu,O, -6. The phonon thermal conductivity is considered only in the range of T < f r, and T > K , because separation of the electron thermal conductivity from the measured total value is complicated between these two limits. The results of analyzing some crystals provide a useful characterization of the mean densities of defects and show the dependence of the scattering mechanisms on the oxygen content.Es werden Messungen der Warmeleitfahigkeit in der ah-Ebene unterschiedlicher YBa,Cu,O, -,-

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Section: Methodsmentioning

confidence: 99%

A Numerical Analysis of the Thermal Conductivity in the ab‐Plane of YBa₂Cu₃O_7‐δ

Eversmann

Kopte

Dörr

et al. 1994

Physica Status Solidi (b)

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“…Scanning Tunneling Microspectroscopy (STM/S) is known as a spectroscopic technique with high spatial and energy resolution. It has been successfully employed in the investigation of electronic structures of superconductors, particularly in the exploration of the effects of impurities, magnetic vortices, and microscopic inhomogeneities in unconventional superconductors, in which all these effects are very local [5][6][7][8][9][10][11][12][13]. In this article, we present a direct experimental study of this theoretical prediction by performing STM/S experiments on the transition metal carbide superconductor NbC that has some excellent properties for applications, such as high hardness, high melting point, corrosion resistance, etc.…”

Section: Introductionmentioning

confidence: 99%

“…It has been successfully employed in investigations of the electronic structures of superconductors, particularly in the exploration of the effects of impurities, magnetic vortices, and microscopic inhomogeneities in unconventional superconductors, where all these effects are highly local. [5][6][7][8][9][10][11][12][13] In this article, we present a direct experimental study of this theoretical prediction by performing STM/S experiments on the transition metal carbide superconductor NbC, which has a number of excellent properties for various applications, including high hardness, high melting point, and corrosion resistance, among others. [14][15][16] The superconductivity of NbC was first reported in 1952, and its critical temperature was found to be approximately 11 K, which is higher than that of elemental Nb.…”

Section: Introductionmentioning

confidence: 99%

Direct observation of the scaling relation between density of states and pairing gap in a dirty superconductor*

Zhu¹,

Liu²,

Song³

et al. 2021

Chinese Phys. B

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Theories and experiments on "dirty superconductors" are sophisticated but important for both fundamentals and applications. It becomes more challenging when magnetic fields are present, because the field distribution, the electron density of states, and the superconducting pairing potentials are nonuniform. Here we present tunneling microspectroscopic experiments on NbC single crystals and show that NbC is a homogeneous dirty superconductor. When applying magnetic fields to the sample, we observe that the zero-energy local density of states and the pairing energy gap follow an explicit scale relation proposed by de Gennes for homogeneous dirty superconductors in high magnetic fields. Surprisingly, our experimental findings suggest that the validity of the scale relation extends to magnetic field strengths far below the upper critical field and call for new nonperturbative understanding of this fundamental property in dirty superconductors. On the practical side, we use the observed scale relation to drive a simple and straightforward experimental scheme for extracting the superconducting coherence length of a dirty superconductor in magnetic fields.

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Vortex Pinning by (001) Planes and by Twin Boundaries in YBCO Single Crystals

Hergt

Andrä

Hiergeist

et al. 1992

Phys. Stat. Sol. (a)

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A YBCO single crystal having only one twin domain with very uniform twin spacing is investigated by torque magnetometry with field rotation parallel to a {110} plane which is either perpendicular or parallel to twin planes. Experimental data are analyzed with respect to irreversible and reversible torque contributions. From the latter one an anisotropy ratio γ = 9 is determined. Several rotational hysteresis loss contributions are identified, the most remarkable of which are very anisotropic losses due to intrinsic pinning and twin pinning. By using different measuring geometries it is shown that twin boundaries do not assist in the intrinsic pinning process as it was suggested in the literature. Isotropic losses are ascribed to impurity atoms. Viscous losses arising during vortex motion are small in comparison to all other losses. The results are discussed in terms of recent pinning models from literature.

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The influence of several impurities on the microstructure and superconducting properties of YBa2Cu3O7−x single crystals

Cited by 7 publications

References 9 publications

A Numerical Analysis of the Thermal Conductivity in the ab‐Plane of YBa₂Cu₃O_7‐δ

A Numerical Analysis of the Thermal Conductivity in the ab‐Plane of YBa₂Cu₃O_7‐δ

Direct observation of the scaling relation between density of states and pairing gap in a dirty superconductor*

Vortex Pinning by (001) Planes and by Twin Boundaries in YBCO Single Crystals

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The influence of several impurities on the microstructure and superconducting properties of YBa2Cu3O7−x single crystals

Cited by 7 publications

References 9 publications

A Numerical Analysis of the Thermal Conductivity in the ab‐Plane of YBa2Cu3O7‐δ

A Numerical Analysis of the Thermal Conductivity in the ab‐Plane of YBa2Cu3O7‐δ

Direct observation of the scaling relation between density of states and pairing gap in a dirty superconductor*

Vortex Pinning by (001) Planes and by Twin Boundaries in YBCO Single Crystals

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A Numerical Analysis of the Thermal Conductivity in the ab‐Plane of YBa₂Cu₃O_7‐δ

A Numerical Analysis of the Thermal Conductivity in the ab‐Plane of YBa₂Cu₃O_7‐δ