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

Source: Phys. Rev. Lett. 104, 027003 (2010); doi:10.1103/PhysRevLett.104.027003

Published 13 January 2010

PACS
  • 74.25.Gz
    Optical properties of superconductors
  • 74.25.Ha
    Magnetic properties of superconductors
  • 74.70.Xa
    Pnictides and chalcogenides
  • 78.47.D-
    Time resolved spectroscopy (>1 psec)
  • YEAR: 2010
PUBLICATION DATA
ISSN:
1553-9601 (online)
Publisher:
AIP is a member of CrossRef APS
Elbert E. M. Chia,1 D. Talbayev,2 Jian-Xin Zhu,2 H. Q. Yuan,3,2 T. Park,2,4 J. D. Thompson,2 C. Panagopoulos,1,5 G. F. Chen,6 J. L. Luo,6 N. L. Wang,6 and A. J. Taylor2
1Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
2Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
3Department of Physics, Zhejiang University, Hangzhou, Zhejiang 310027, China
4Department of Physics, Sungkyunkwan University, Suwon 440-746, South Korea
5Department of Physics, University of Crete and FORTH, 71003 Heraklion, Greece
6Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
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. ©2010 The American Physical Society
History: Received 18 December 2008; published 13 January 2010
Permalink: http://link.aps.org/abstract/PRL/v104/e027003
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