title: New experimental perspectives for soft x-ray absorption spectroscopies at ultra-low temperatures below 50 mK and in high magnetic fields up to 7 T.
abstract: A new ultra-low temperature experiment including a superconducting vector magnet has been developed for soft x-ray absorption spectroscopy experiments at third generation synchrotron light sources. The sample is cooled below 50 mK by a cryogen free (3)He-(4)He dilution refrigerator. At the same time, magnetic fields of up to ±7 T in the horizontal direction and ±0.5 T in the vertical direction can be applied by a superconducting vector magnet. The setup allows to study ex situ and in situ prepared samples, offered by an attached UHV preparation chamber with load lock. The transfer of the prepared samples between the preparation section and the dilution refrigerator is carried out under cryogenic temperatures. First commissioning studies have been carried out at the Variable Polarization XUV Beamline P04 at PETRA III and the influence of the incident photon beam to the sample temperature has been studied.
authors.affiliation: Physics Department, University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Beeck
authors.affiliation: Physics Department, University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany.
authors.forename: I
authors.initials: I
authors.lastname: Baev
authors.affiliation: Physics Department, University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Gieschen
authors.affiliation: Physics Department, University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany.
authors.forename: H
authors.initials: H
authors.lastname: Meyer
authors.affiliation: Physics Department, University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Meyer
authors.affiliation: Physics Department, University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Palutke
authors.affiliation: Physik-Department E20, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany.
authors.forename: P
authors.initials: P
authors.lastname: Feulner
authors.affiliation: Walther-Meißner-Institute, Walther-Meißner-Straße 8, 85748 Garching, Germany.
authors.forename: K
authors.initials: K
authors.lastname: Uhlig
authors.affiliation: Physics Department, University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Martins
authors.affiliation: Physics Department and Center for Free-Electron Laser Science, University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany.
authors.forename: W
authors.initials: W
authors.lastname: Wurth