Twin refinement below room temperature in the 1-2-3 highT c superconductors

Smith, James F.; Wohlleben, D.

doi:10.1007/bf01312818

Cited by 37 publications

(4 citation statements)

References 19 publications

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“…The formation of the domains is now reversible, as has been observed in our measurement. In isolated grains of 123 a narrowing of the twin spacing has been observed at low temperatures [30], which did not occur in grains in close contact to each other. Our measurements indicate that this behaviour does not exist in the LaLsTSro.t3CuO4 crystal, at least not down to 20 K. As in our case the orthorhombic distortion increases even stronger on decreasing temperature, which leads to higher strains at the twin boundaries especially between the lamellae sets, it should be favorable to reduce the average twin size at low temperatures.…”

Section: Temperature Dependence Of the Domain Structurementioning

confidence: 96%

Characterization and structural analysis of twinned La2−xSrxCuO4±δ crystals by neutron diffraction

Braden

Heger

Schweiß

et al. 1992

Physica C: Superconductivity

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The microstructure of La2_~SrxCuO4±6 crystals has been studied by neutron diffraction. Profile analysis of the intensity of Bragg reflections shows that the large crystals consist of domains of four different orientations, which are related to the symmetry reduction of the phase transition 14/mmm-Abma. The domain structure has a strong i~fi~, o:~c on the extinction, therefore it may be studied macroscopically. The microstructure is formed at the phase transition and does not change in the or~horhombic phase. After a first cooling cycle the formation of the domains appears to be reversible without a temperature hyste:esls. [ne same domain structure appears in consecutive cooling cycles. This indicates a pinning of the domain structure v,) lattice defects. A data set of Bragg reflection intensities obtained on a twinned Lal.93Sro.07CuO 4 crystal at room temperature could be refined with special consideration of the microtwinning. The achieved precision of structural parameters is almost comparable to structural analyses on monodomain single crystals.

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Section: Temperature Dependence Of the Domain Structurementioning

confidence: 96%

Characterization and structural analysis of twinned La2−xSrxCuO4±δ crystals by neutron diffraction

Braden

Heger

Schweiß

et al. 1992

Physica C: Superconductivity

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“…Therefore no further examinations were done with these samples. A slight difference in twinning in ground and thinned material was found in YBa,Cu,O, also, but not in this pronounced way [22].…”

Section: Resultsmentioning

confidence: 80%

Microtwin Domains and Phase Transitions in La1.85−x Ndx Sr0.15 CuO4

Kriebel¹,

Gottschalk²,

Büchner³

1992

Phys. Stat. Sol. (a)

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Microstructural phenomena and phase transitions of the Nd‐doped La1.85 Sr0 15 CuO4 system are studied in an electron microscope. In ion‐milled samples, twin domains appear and disappear as expected at the high temperature phase transition. At temperatures below the high temperature transition, these twin domains show a very subtle behaviour. Ground material even in the orthorhombic phase shows no twins at all. In ion‐thinned material a typical reduction of the domain size occurs after an electron illumination time of about one hour. Generally no reversible change of the twin configuration could be observed at the low temperature phase transition.

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“…(2) The results do not depend on the setting of the defocus. When working without the objective lens it is impossible to gain control over the actual defocus.…”

Section: Resultsmentioning

confidence: 89%

Determination of transition curves of high‐T_c superconductors by phase contrast microscopy

et al. 1995

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A new method which allows the detection of the superconducting phase transition of high-T, superconductors (HTSC) on a microscopic scale is reported. Micro-size holes in thin foils of superconducting material are examined in a transmission electron microscope at varying temperatures. The superconducting transition induces small changes in the image intensity within the holes, which can be detected by using electronic image analysis. Superconducting transition curves are then obtained for various types of high-T, superconductors and for given values of the applied magnetic field.

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Twin refinement below room temperature in the 1-2-3 highT c superconductors

Cited by 37 publications

References 19 publications

Characterization and structural analysis of twinned La2−xSrxCuO4±δ crystals by neutron diffraction

Characterization and structural analysis of twinned La2−xSrxCuO4±δ crystals by neutron diffraction

Microtwin Domains and Phase Transitions in La1.85−x Ndx Sr0.15 CuO4

Determination of transition curves of high‐T_c superconductors by phase contrast microscopy

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Twin refinement below room temperature in the 1-2-3 highT c superconductors

Cited by 37 publications

References 19 publications

Characterization and structural analysis of twinned La2−xSrxCuO4±δ crystals by neutron diffraction

Characterization and structural analysis of twinned La2−xSrxCuO4±δ crystals by neutron diffraction

Microtwin Domains and Phase Transitions in La1.85−x Ndx Sr0.15 CuO4

Determination of transition curves of high‐Tc superconductors by phase contrast microscopy

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Determination of transition curves of high‐T_c superconductors by phase contrast microscopy