Ultrafast pump-probe study of phase separation and competing orders in the underdoped (Ba,K)Fe2As2 superconductor.
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.
Chia
Elbert E M
EE
Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore.
Talbayev
D
D
Zhu
Jian-Xin
JX
Yuan
H Q
HQ
Park
T
T
Thompson
J D
JD
Panagopoulos
C
C
Chen
G F
GF
Luo
J L
JL
Wang
N L
NL
Taylor
A J
AJ