Magnetic Phenomena in Condense Matter - Scientific Overview

Solenoid Simulation

Solenoid Simulation

Foto: Carsten Baehtz

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Since the discovery of superconductivity in the year 1911 by Heike Kamerlingh Onnes open questions in this field of research still remain. Superconductors respectively correlated electron systems exhibit spectacular properties which are also in the field of interest of the HIBEF user consortium like

  • Unconventional superconductors like cuprates and iron pnictides
  • Electronic liquid crystal states in superconductors
  • Electronic ordering phenomena like colossal magnetic resistivity, metal-isolator transition or unconventional metallic phase

To investigate these physical properties, X-Ray diffraction measurements at times resonant is an established method at third generation synchrotron, often limited to low fields due to the usage of DC-magnets. But there is a tremendous need in the community for stronger magnetic fields, which can be fulfilled with pulsed power techniques. As a consequence of this method time for data collection is extremely restricted and such a setup should be combined with most brilliant sources X-ray sources.

The HIBEF user consortium will provide such an experimental setup at the HED station of the European XFEL. A two stage installation is foreseen. At day-1 a double conical solenoid will be available, with an exit opening of ±30 degree for the diffracted beam. First simulation show magnetic field up to 60 tesla can be reached. Pulse duration is adapted to the European XFEL time and bunch train structure and will be 0.6ms. Power consumption is relative moderate around 400kJ and can be provided by a mobile unit. With such a coil single crystal as well as powder diffraction experiments, XMCD and spectroscopic measurements can be performed. In selected cases also anomalous diffraction experiments are feasible, these experiments are limited by the geometry of the coil more precisely the angular opening of the exit cone of ±30°2ϑ.

At the second stage a split pairs coil is foreseen with a higher angular opening >> 90° in 2ϑ, this setup is dedicated for resonant experiments at lower photon energies. In general split coil need more energy therefore an upgrade of the existing to capacitor bank 1MJ is planned. The magnetic field archived by this arrangement will be around 45T.

This experimental setup must be seen as an experimental continuation of the research performed at P09 at PETRA III, operated by DESY, which is also member of the HIBEF UC.