Magnetic structure of the pressure induced antiferromagnetic phase of FeSe at low temperature
We have recently studied by XRD (at ESRF) and RIXS (at SOLEIL) the pressure and low temperature phase diagram of superconducting (SC) FeSe. The Cmma phase of FeSe transforms at 1GPa in a distorted structure, found antiferromagnetic (AFM) by muons spectroscopy. Above 6.5GPa a second high pressure (HP) phase (Pnma) appears which shows a higher magnetic moment (deduced from the K beta'(Fe) emission line). In this proposal we want to determine the unresolved magnetic structure of the AFM phase by neutron scattering on single crystal pressurized at 2GPa in a hybrid clamp-type cell using the IN22 instrument. More generally our work will allow to better understand the low temperature part of the controversial P,T phase diagram of FeSe, in particular the interplay between the SC phase and the AFM phase in the 1-2GPa range.
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TOULEMONDE Pierre; BOURDAROT Frederic; BRAITHWAITE Daniel; KNEBEL Georg and Mingwei MA. (2018). Magnetic structure of the pressure induced antiferromagnetic phase of FeSe at low temperature. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-41-955
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