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American Physical Society, Physical Review Letters, 2(104)

DOI: 10.1103/physrevlett.104.027003

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Ultrafast Pump-Probe Study of Phase Separation and Competing Orders in the Underdoped(Ba,K)Fe2As2Superconductor

Journal article published in 2010 by Elbert E. M. Chia ORCID, D. Talbayev, Jian-Xin Zhu ORCID, H. Q. Yuan, T. Park, J. D. Thompson, C. Panagopoulos, G. F. Chen, J. L. Luo, N. L. Wang, A. J. Taylor
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This paper is available in a repository.

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Abstract

We report measurements of quasiparticle relaxation dynamics in the high-temperature superconductor $(\mathrm{Ba},\mathrm{K}){\mathrm{Fe}}_{2}{\mathrm{As}}_{2}$ in optimally doped, underdoped, and undoped regimes. In the underdoped sample, spin-density wave (SDW) order forms at $$∼${}85\text{ }\text{ }\mathrm{K}$, followed by superconductivity at $$∼${}28\text{ }\text{ }\mathrm{K}$. We find the emergence of a normal-state order that suppresses SDW at a temperature ${T}^{*}$∼${}60\text{ }\text{ }\mathrm{K}$ and argue that this normal-state order is a precursor to superconductivity.