Ultrafast Relaxation Dynamics of Spin-Density Wave Order in BaFe2As2 under High Pressures
Ultrafast Relaxation Dynamics of Spin-Density Wave Order in BaFe2As2 under High Pressures
Fotev, I.; Winnerl, S.; Aswartham, S.; Wurmehl, S.; Büchner, B.; Schneider, H.; Helm, M.; Pashkin, O.
BaFe2As2 is the parent compound for a family of iron-based high-temperature superconductors as well as a prototypical example of the spin-density wave (SDW) system. In this study, we perform an optical pump-probe study of this compound to systematically investigate the SDW order across the pressure-temperature phase diagram. The suppression of the SDW order by pressure manifests itself by the increase of relaxation time together with the decrease of the pump-probe signal and the pump energy necessary for complete vaporization of the SDW condensate. We have found that the pressure-driven suppression of the SDW order at low temperature occurs gradually in contrast to the thermally-induced SDW transition. Our results suggest that the pressure-driven quantum phase transition in BaFe2As2 (and probably other iron pnictides) is continuous and it is caused by the gradual worsening of the Fermi-surface nesting conditions.
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Data publication: Ultrafast Relaxation Dynamics of Spin-Density Wave Order in …
ROBIS: 37139 HZDR-primary research data are used by this (Id 37134) publication
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Physical Review B 108(2023), 035101
DOI: 10.1103/PhysRevB.108.035101
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