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Competing energy scales in high‐temperature superconductors: Ultrafast pump–probe studies
Author(s) -
Chia Elbert E. M.,
Zhu JianXin,
Talbayev D.,
Taylor A. J.
Publication year - 2011
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201004371
Subject(s) - pseudogap , superconductivity , cuprate , condensed matter physics , pnictogen , quasiparticle , physics , order (exchange) , materials science , finance , economics
We present a review of photoexcited quasiparticle dynamics of cuprate and pnictide high‐temperature superconductors in regimes (temperature, doping) where different phases such as superconductivity, spin‐density‐wave (SDW) and pseudogap phases coexist or compete with one another. We start with the overdoped cuprate superconductor Y 1– x Ca x Ba 2 Cu 3 O 7– δ , where the superconducting gap and pseudogap coexist in the superconducting state. In another cuprate Tl 2 Ba 2 Ca 2 Cu 3 O y , we ob‐ serve a competition between SDW and superconducting orders deep in the superconducting state. Finally, in the underdoped iron pnictide superconductor (Ba,K)Fe 2 As 2 , SDW order forms at 85 K, followed by superconductivity at 28 K. We also 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. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)