J. R. Schneider

A triple-crystal diffractometer for high-energy synchrotron radiation at the HASYLAB high-field wiggler beamline BW5.

The triple-crystal diffractometer installed at HASYLAB beamline BW5 with a high-field wiggler of critical energy 27 keV for DORIS III, operated at 4.5 GeV electron energy, is described. Samples can be mounted in large cryostats or furnaces normally used in neutron scattering experiments. The instrument has been successfully applied to measure structure factors S(Q) in liquids and amorphous materials, to collect full data sets of highly accurate structure factors for charge-density work, to measure the spin component of the ground-state magnetization in transition-metal and rare-earth compounds, to study the diffuse scattering from stacking faults and dislocation loops in Si single crystals, and for the investigation of various aspects of structural phase transitions: critical scattering in SrTiO3, oxygen order and stripe order in high-To materials. A crossed-beam technique allows for local studies of texture, internal strain and phase changes in the bulk of materials.

Oxygen-ordering superstructures in underdoped YBa 2 Cu 3 O 6 + x studied by hard x-ray diffraction

High-energy x-ray diffraction is used to investigate the bulk oxygen-ordering properties of

Superstructure formation and the structural phase diagram of YBa2Cu3O6+x

{mathrm{YBa}}_{2}{mathrm{Cu}}_{3}{mathrm{O}}_{6+x}.

Observation of ortho-III correlations by neutron and hard X-ray scattering in an untwinned YBa2Cu3O6.77 single crystal

Four different superstructures of Cu-O chains aligned along the b axis and ordered with periodicity

Charge stripes seen with X-rays in La1.45Nd0.4Sr0.15CuO4

ma,

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along the a axis have been observed. For

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xl0.62,

Dynamics of Oxygen ordering in YBa2Cu3O6+x studied by neutron and high-energy synchrotron x-ray diffraction

the only observed superstructure is ortho-II with

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m=2.

X-ray scattering study of charge scattering associated with stripe order in La2NiO4

At room temperature, we find ortho-III