P09 Resonant Scattering and Diffraction beamline

Science Highlight P09 (RSD)
S. Nandi, W. T. Jin, Y. Xiao, Y. Su, S. Price, D. K. Shukla, J. Strempfer, H. S. Jeevan, P. Gegenwart, and Th. Brückel, "Coexistence of superconductivity and ferromagnetism in P-doped EuFe2As2”, Physical Review B, 89, 014512, 10.1103/PhysRevB.89.014512 (2014)
Copyright (2014) by the APS *

Science Highlight P09 (HAXPES)
H. J. Elmers, A. Chernenkaya, K. Medjanik, M. Emmel, G. Jakob, G. Schönhense, D. Gottlo, I. Krug, F. M. F. de Groot, A. Gloskovskii, "Exchange coupling in the correlated electronic states of amorphous GdFe films”, Physical Review B, 88, 174407, 10.1103/PhysRevB.88.174407 (2013)
Copyright (2013) by the APS *

* American Physical Society: Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society

P09 is designed to operate in the hard x-rays regime with energies ranging from 2.7 to 50 keV. The beamline consists of three experimental hutches. The first two experimental hutches, EH1 and EH2, are dedicated to resonant X-ray scattering and general diffraction (RSD) as well as XMCD experiments. The third hutch, EH3, houses a Hard X-ray Photoelectron Spectroscopy (HAXPES) setup.

Experimental Hutch 1 is used for resonant X-ray scattering experiments to investigate magnetic order, orbital order or other processes giving rise to non zero intensity at otherwise forbidden positions in reciprocal space. In addition other scattering experiments requiring good energy tunability between 2.7 and 24 keV or variable polarization, like non-resonant magnetic scattering, can be performed. A phase retarder and a polarization analyzer are available in order to vary and analyze the polarisation of the incoming and scattered beam, respectively. Closed-cycle cryostats covering the temperature range between 1.7K and 800K and a He-flow cryostat are available. Complete windowless operation of the diffractometer is also possible.

Experimental hutch 2 is equipped with a heavy-load horizontal Psi-diffractometer. It can be used for heavy sample chambers or the 14 T split-coil cryomagnet available at the beamline. The 14 T magnet is working in the temperature range from 1.8 K up to 300 K with the VTI or down to 320 mK using the He-3 insert.
A large volume pulse tube cryostat with high cooling power is available for high pressure experiments using diamond anvil cells (DACs). XMCD experiments at low temperatures are possible using an electromagnet in absorption and total fluorescence yield mode.

Experimental hutch 3 houses an instrument for Hard X-ray Photoelectron Spectroscopy (HAXPES). It uses a SPECS Phoibos 225HV electron analyzer, measuring electron energies up to 12 keV. Typically, the experiments use X-rays directly from the high heat load Si(111) or (311) monochromator, for higher resolution requirements an additional channel-cut Si(333)/(555) mochromator is added. For core level XMCD studies, circular polarized X-rays are available from the phase retarder setup. Focusing at the sample position is achieved with the same mirrors used for focusing in EH1 and EH2. The experiment chamber is equipped with a 5-axis manipulator with integrated LHe-cooling down to about 20K t the sample.

REXS 2016 Conference: June 13 - 17 2016 at DESY