Open AccessSingle‐crystal X‐ray diffraction and resonant X‐ray magnetic scattering at helium‐3 temperatures in high magnetic fields at beamline P09 at PETRA III
Author(s) -
Francoual S.,
Strempfer J.,
Warren J.,
Liu Y.,
Skaugen A.,
Poli S.,
Blume J.,
WolffFabris F.,
Canfield P. C.,
Lograsso T.
Publication year - 2015
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s1600577515014149
Subject(s) - beamline , x ray , helium , scattering , diffraction , synchrotron , advanced photon source , synchrotron radiation , magnetic field , materials science , optics , physics , atomic physics , beam (structure) , quantum mechanics
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 TmVO 4 , it is found that the photon flux at P09 must be attenuated down to 1.5 × 10 9 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 L III absorption edge associated with the spin‐density wave in TmNi 2 B 2 C below 1.5 K is intense enough to permit a complete study in magnetic field and at sub‐Kelvin temperatures to be carried out.