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Portail > Offres > Offre UPR3228-FABDUC-001 - Chercheur.e post-doc: Spectroscopies d'absorption x en conditions extrêmes multiples H/F

XAS and XMCD in multi-extreme conditions of field, pressure and temperature H/F

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Français - Anglais

Date Limite Candidature : mardi 28 septembre 2021

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General information

Reference : UPR3228-FABDUC-001
Workplace : TOULOUSE
Date of publication : Wednesday, August 18, 2021
Type of Contract : FTC Scientist
Contract Period : 24 months
Expected date of employment : 1 November 2021
Proportion of work : Full time
Remuneration : between 2648 € et 3768 € brut/month depending on experience
Desired level of education : PhD
Experience required : Indifferent

Missions

This Postdoctoral Research Associate position is focused on the study of the interplay between magnetism and electronic structure in strongly correlated electron systems, using energy dispersive X-ray Absorption Spectroscopy (XAS) and X-ray Magnetic Circular Dichroism (XMCD) measurements in multi-extreme conditions of magnetic field (up to 30 T), high pressures (up to 10-11 GPa) and low temperatures (down to 1.5 K). Energy dispersive XAS and XMCD are ideally suited to simultaneously probe the electronic and magnetic state with elemental and orbital selectivity. Very high magnetic fields are required to control competing electronic and magnetic energy scales such as a correlation gaps, or exchange interactions. The application of pressure modifying the lattice parameters provides an additional means to finely tune these energy scales. This allows one to gain a more complete understanding, and - in some cases - to lower the corresponding critical fields to make new phases accessible at all, and access states which can be reached by pressure only.
The successful candidate will play a leading role in conducting energy dispersive XAS and XMCD measurements under multi-extreme conditions on different compounds of strongly correlated electrons systems, taking in charge the preparation of the experiments and the data analysis, as well as in designing new software tools for data treatment.

Activities

- Develop a research activity in the field of strongly correlated electron systems exploiting the LNCMI pulsed high magnetic field setup at ESRF beamline ID24.
- Get involved in the samples preparation and characterization (LAUE diffraction, polishing or FIB preparation) prior to their mounting on sample holders and diamond anvil cells.
- Perform energy dispersive XAS and XMCD measurements under multi-extreme conditions. This will involve using and developing the miniature plastic turnbuckle diamond anvil cells in pulsed magnetic fields.
- Support the development and execution of the data analysis by using and extending an existing code-base.
- Disseminate research results through peer reviewed publications and presentations at scientific meetings and conferences.

Skills

- Prior research interest in spectroscopy or scattering data is required, with direct experience in X-ray signal analysis being preferred.
- Proven knowledge of magnetism.
- Capability in developing complex experimental equipment.
- Solid background in programming and in the writing of computational codes for the data treatment.

Work Context

The project will run with Fabienne Duc who works in the Conductors and Quantum Magnets group at the pulsed magnetic field facility LNCMI-Toulouse and studies magnetic field-induced phases in strongly correlated electron systems (magnetic quantum spin systems and heavy fermions) using x-ray and neutron scattering techniques in high magnetic fields.
The Laboratoire National des Champs Magnétiques Intenses (LNCMI) is a research infrastructure welcoming researchers from around the world for high magnetic field experiments. At two sites, LNCMI offers continuous fields in Grenoble (LNCMI-G) and pulsed fields in Toulouse (LNCMI-T). The scientific activities of the laboratory involved both in-house and collaborative research.
XAS and XMCD experiments in multi-extreme conditions will be performed in transmission mode on the energy dispersive x-ray absorption spectroscopy beamline ID24 at the European Synchrotron Radiation Facility, Grenoble, with Olivier Mathon, coordinator of the beamline, with whom we have established a long-standing collaboration. In particular, for this project we will be working closely with Cornelius Strohm (DESY, Hamburg, Germany), who has great expertise in the development of synchrotron techniques in multi-extreme conditions of field, pressure and temperature.

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