Materials Science and Engineering, Physics and Astronomy, Ames Laboratory
Journal or Book Title
Journal of Synchrotron Radiation
The resonant scattering and diffraction beamline P09 at PETRA III at DESY is equipped with a 14 T vertical field split-pair magnet. A helium-3 refrigerator is available that can be fitted inside the magnet's variable-temperature insert. Here the results of a series of experiments aimed at determining the beam conditions permitting operations with the He-3 insert are presented. By measuring the tetragonal-to-orthorhombic phase transition occurring at 2.1 K in the Jahn-Teller compound TmVO4, it is found that the photon flux at P09 must be attenuated down to 1.5 × 109 photons s-1 for the sample to remain at temperatures below 800 mK. Despite such a reduction of the incident flux and the subsequent use of a Cu(111) analyzer, the resonant X-ray magnetic scattering signal at the Tm LIII absorption edge associated with the spin-density wave in TmNi2B2C below 1.5 K is intense enough to permit a complete study in magnetic field and at sub-Kelvin temperatures to be carried out.
International Union of Crystallography
Francoual, S.; Strempfer, J.; Cryogenic Ltd.; Liu, Yong; Skaugen, A.; Poli, S.; Blume, J.; Wolff-Fabris, J.; Canfield, Paul C.; and Lograsso, Thomas A., "Single-crystal X-ray diffraction and resonant X-ray magnetic scattering at helium-3 temperatures in high magnetic fields at beamline P09 at PETRA III" (2015). Ames Laboratory Publications. 413.