Ultrafast Pump-Probe Study of Phase Separation and Competing Orders in the Underdoped (Ba,K)Fe2As2 Superconductor

Elbert E. M. Chia; D. Talbayev; Jian-Xin Zhu; H. Q. Yuan; T. Park; J. D. Thompson; C. Panagopoulos; G. F. Chen; J. L. Luo; N. L. Wang; A. J. Taylor

doi:10.1103/PhysRevLett.104.027003

Ultrafast Pump-Probe Study of Phase Separation and Competing Orders in the Underdoped (Ba,K)Fe2As2 Superconductor

Elbert E. M. Chia, D. Talbayev, Jian-Xin Zhu, H. Q. Yuan, T. Park, J. D. Thompson, C. Panagopoulos, G. F. Chen, J. L. Luo, N. L. Wang, A. J. Taylor

DOI 10.1103/PhysRevLett.104.027003 · Physical Review Letters

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Abstract

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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
(Ba,K)Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	28	Pressure not reported	unknown
(Ba,K)Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	36	Pressure not reported	unknown