Ultrafast Relaxation Dynamics of Spin-Density Wave Order in BaFe${}_2$As${}_2$ under High Pressures

Abstract

BaFe${}_2$As${}_2$ 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 BaFe${}_2$As${}_2$ (and probably other iron pnictides) is continuous and it is caused by the gradual worsening of the Fermi-surface nesting conditions.

References in corpus (11)

• High-temperature superconductivity in iron-based materials
• Spin density wave anomaly at 140 K in the ternary iron arsenide BaFe2As2
• Determination of the phase diagram of the electron doped superconductor Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Superconductivity up to 29 K in SrFe2As2 and BaFe2As2 at high pressures
• Quantum Criticality
• Ultrafast transient generation of spin-densitywave order in the normal state of BaFe2As2 driven by coherent lattice vibrations
• Controlled vaporization of the superconducting condensate in cuprate superconductors sheds light on the pairing boson
• Electrodynamics of electron doped iron-pnictide superconductors: Normal state properties
• Electron-phonon coupling and charge gap in spin-density-wave iron-pnictides from quasiparticle relaxation dynamics
• Dynamic competition between spin density wave order and superconductivity in underdoped $B{a}_{1-x}{K}_{x}F{e}_{2}A{s}_2$
• Two distinct superconducting states controlled by orientation of local wrinkles in LiFeAs

Cited by in corpus (2)

• Density-wave-like gap evolution in La${}_3$Ni${}_2$O${}_7$ under high pressure revealed by ultrafast optical spectroscopy
• Ultrafast Spectroscopy of Dirac Semimetal Cd3As2 under Pressure