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 |
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| Authors: | S. Francoual J. Strempfer J. Warren Y. Liu A. Skaugen S. Poli J. Blume F. Wolff‐Fabris P. C. Canfield T. Lograsso |
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| Abstract: | 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. |
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| Keywords: | X‐ray diffraction resonant X‐ray magnetic scattering helium‐3 insert cryostat sub‐Kelvin temperatures X‐ray beam heating single‐crystal |
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