Oxygen ordering and superconductivity in GdBaSrCu3O7−x

Wang, X. Z.; Hellebrand, B.; Bäuerle, D.; Strecker, M.; Wortmann, G.; Lang, W.

doi:10.1016/0921-4534(94)02370-0

Cited by 22 publications

(10 citation statements)

References 30 publications

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“…3 demonstrates that, despite of the significantly different absolute values of ρ xx , all three samples exhibit a similar qualitative behavior when a scaling according to ρ xx (T )/ρ xx (300 K) is applied. This fact contrasts with the typical observation in HTSCs with point defects like disordered oxygen atoms [24,25], where such a scaling is violated and the intercept ρ xx (0 K) from an extrapolation of the normal state is shifted to higher values when the concentration of point defects is increased. In fact, ρ xx (0 K) is slightly negative and similar for all three samples, indicating a minor influence of point defects on the resistivity.…”

Section: Resultscontrasting

confidence: 84%

Resistivity, Hall effect, and anisotropic superconducting coherence lengths of HgBa$_2$CaCu$_2$O$_{6+δ}$ thin films with different morphology

Richter,

Lang,

Peruzzi

et al. 2020

Preprint

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Thin films of the high-temperature superconductor HgBa2CaCu2O 6+δ have been prepared on SrTiO3 substrates by pulsed-laser deposition of precursor films and subsequent annealing in mercuryvapor atmosphere. The microstructural properties of such films can vary considerably and have been analyzed by x-ray diffraction and atomic force microscopy. Whereas the resistivity is significantly enhanced in samples with coarse-grained structure, the Hall effect shows little variation. This disparity is discussed based on models for transport properties in granular materials. We find that, despite of the morphological variation, all samples have similar superconducting properties. The critical temperatures Tc ∼ 121.2 K . . . 122.0 K, resistivity, and Hall data indicate that the samples are optimally doped. The analyses of superconducting order parameter fluctuations in zero and finite magnetic fields yield the in-plane ξ ab (0) ∼ 2.3 nm . . . 2.8 nm and out-of-plane ξc(0) ∼ 0.17 nm . . . 0.24 nm Ginzburg-Landau coherence lengths at zero temperature. Hall measurements provide estimates of carrier scattering defects in the normal state and vortex pinning properties in the superconducting state inside the grains.

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Section: Resultscontrasting

confidence: 84%

Resistivity, Hall effect, and anisotropic superconducting coherence lengths of HgBa$_2$CaCu$_2$O$_{6+δ}$ thin films with different morphology

Richter,

Lang,

Peruzzi

et al. 2020

Preprint

Self Cite

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“…However, beaded filaments resembling those seen in vivo are formed only when the two proteins coassemble in the presence of ␣-crystallin (20). Moreover, ␣-crystallin has been shown to inhibit assembly of vimentin (18), accelerate actin polymerization and reduce actin depolymerization (17), and protect against stressinduced aggregation of actin. Additionally, ␣-crystallin has been shown to bind to both actin and filamentous desmin in cardiac muscle cells (16,19,30).…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, it was shown by Horwitz (14) that ␣-crystallins function in vitro as chaperones, preventing heat-induced aggregation of numerous proteins and assisting in the renaturation of chemically denatured proteins. ␣-Crystallin has also been shown to associate with a variety of cytoskeletal proteins, including actin (15)(16)(17), vimentin (18), desmin (19), and lens beaded filament proteins (18,20), and has been detected along with cytoskeletal elements in cytoplasmic inclusion bodies in several human diseases (21). In addition, Kantorow and Piatigorsky (22) demonstrated that purified ␣-crystallin has autokinase activity.…”

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confidence: 99%

Targeted disruption of the mouse αA-crystallin gene induces cataract and cytoplasmic inclusion bodies containing the small heat shock protein αB-crystallin

Brady

Garland

Duglas-Tabor

et al. 1997

Proc. Natl. Acad. Sci. U.S.A.

314

242

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alpha A-crystallin (alpha A) and alpha B-crystallin (alpha B) are among the predominant proteins of the vertebrate eye lens. In vitro, the alpha-crystallins, which are isolated together as a high molecular mass aggregate, exhibit a number of properties, the most interesting of which is their ability to function as molecular chaperones for other proteins. Here we begin to examine the in vivo functions of alpha-crystallin by generating mice with a targeted disruption of the alpha A gene. Mice that are homozygous for the disrupted allele produce no detectable alpha A in their lenses, based on protein gel electrophoresis and immunoblot analysis. Initially, the alpha A-deficient lenses appear structurally normal, but they are smaller than the lenses of wild-type littermates. alpha A-/- lenses develop an opacification that starts in the nucleus and progresses to a general opacification with age. Light and transmission electron microscopy reveal the presence of dense inclusion bodies in the central lens fiber cells. The inclusions react strongly with antibodies to alpha B but not significantly with antibodies to beta- or gamma-crystallins. In addition, immunoblot analyses demonstrate that a significant portion of the alpha B in alpha A-/- lenses shifts into the insoluble fraction. These studies suggest that alpha A is essential for maintaining lens transparency, possibly by ensuring that alpha B or proteins closely associated with this small heat shock protein remain soluble.

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“…An intercept of the extrapolated normal-state resistivity ρ aa (0 K) close to zero or even at slightly negative values of ρ aa (0 K) is commonly considered a sign of a low density of structural defects [30]. Conversely, introducing oxygen disorder enhances the offset, while leaving the slope of ρ aa (T) almost unchanged [31,32].…”

Section: Resultsmentioning

confidence: 99%

Anisotropy of the In-Plane and Out-of-Plane Resistivity and the Hall Effect in the Normal State of Vicinal-Grown YBa2Cu3O7−δ Thin Films

et al. 2021

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The resistivity and the Hall effect in the copper-oxide high-temperature superconductor YBa2Cu3O7−δ (YBCO) are remarkably anisotropic. Using a thin film of YBCO grown on an off-axis cut SrTiO3 substrate allows one to investigate these anisotropic transport properties in a planar and well-defined sample geometry employing a homogeneous current density. In the normal state, the Hall voltage probed parallel to the copper-oxide layers is positive and strongly temperature dependent, whereas the out-of-plane Hall voltage is negative and almost temperature independent. The results confirm previous measurements on single crystals by an entirely different measurement method and demonstrate that vicinal thin films might be also useful for investigations of other layered nanomaterials.

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Oxygen ordering and superconductivity in GdBaSrCu3O7−x

Cited by 22 publications

References 30 publications

Resistivity, Hall effect, and anisotropic superconducting coherence lengths of HgBa$_2$CaCu$_2$O$_{6+δ}$ thin films with different morphology

Resistivity, Hall effect, and anisotropic superconducting coherence lengths of HgBa$_2$CaCu$_2$O$_{6+δ}$ thin films with different morphology

Targeted disruption of the mouse αA-crystallin gene induces cataract and cytoplasmic inclusion bodies containing the small heat shock protein αB-crystallin

Anisotropy of the In-Plane and Out-of-Plane Resistivity and the Hall Effect in the Normal State of Vicinal-Grown YBa2Cu3O7−δ Thin Films

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