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Chia, Elbert E. M.,Talbayev, D.,Zhu, Jian-Xin,Yuan, H. Q.,Park, T.,Thompson, J. D.,Panagopoulos, C.,Chen, G. F.,Luo, J. L.,Wang, N. L.,Taylor, A. J. American Physical Society 2010 Physical Review Letters Vol.104 No.2
<P>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 approximately 85 K, followed by superconductivity at approximately 28 K. We find the emergence of a normal-state order that suppresses SDW at a temperature T{*} approximately 60 K and argue that this normal-state order is a precursor to superconductivity.</P>