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.
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 × 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 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.
Deutsches Elektronen-Synchrotron (DESY), 22603 Hamburg, Germany.
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Francoual
Deutsches Elektronen-Synchrotron (DESY), 22603 Hamburg, Germany.
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Strempfer
Cryogenic Ltd, London W3 7QE, UK.
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Warren
Division of Materials Sciences and Engineering (DMSE), Ames Laboratory, US DOE, Ames, IA 50010, USA.
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Liu
Deutsches Elektronen-Synchrotron (DESY), 22603 Hamburg, Germany.
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Skaugen
Cryogenic Ltd, London W3 7QE, UK.
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Poli
Deutsches Elektronen-Synchrotron (DESY), 22603 Hamburg, Germany.
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J
Blume
Hochfeld-Magnetlabor Dresden (HLD), Helmholtz-Zentrum Dresden-Rossendorf, D-01314 Dresden, Germany.
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Wolff-Fabris
Department of Materials Science and Engineering, Iowa State University, Ames, IA 50011, USA.
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Canfield
Division of Materials Sciences and Engineering (DMSE), Ames Laboratory, US DOE, Ames, IA 50010, USA.
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Lograsso
X-ray beam heating; X-ray diffraction; helium-3 insert cryostat; resonant X-ray magnetic scattering; single-crystal; sub-Kelvin temperatures