Ultrafast pump-probe study of phase separation and competing orders in the underdoped (Ba,K)Fe₂As₂ superconductor
Chia, Elbert E. M. · Talbayev, D. · Zhu, J. -X. · Yuan, H. Q. · Park, T. · Thompson, J. D. · Panagopoulos, C. · Chen, G. F. · Luo, J. L. · Wang, N. L. · Taylor, A. J.
الأصل · EN
We report measurements of quasiparticle relaxation dynamics in the high-temperature superconductor (Ba,K)Fe₂As₂ in optimally doped, underdoped and undoped regimes. In the underdoped sample, spin-density wave (SDW) order forms at 85 K, followed by superconductivity at 28 K. We find the emergence of a normal-state order that suppresses SDW at a temperature T 60 K and argue that this normal-state order is a precursor to superconductivity.
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