Cited 19 time in webofscience Cited 16 time in scopus

Evidence of a pseudogap for superconducting iron-pnictide Ba0.6+delta K0.4-delta Fe2As2 single crystals from optical conductivity measurements

Title
Evidence of a pseudogap for superconducting iron-pnictide Ba0.6+delta K0.4-delta Fe2As2 single crystals from optical conductivity measurements
Authors
Kwon, Yong SeungHong, Jong BeomJang, Yu RanOh, Hyun JinSong, Yun YoungMin, Byeong HunIizuka, TakeuyaKimura, Shin-ichiBalatsky, A. V.Bang, Yunkyu
DGIST Authors
Kwon, Yong Seung
Issue Date
2012-06-07
Citation
New Journal of Physics, 14
Type
Article
Article Type
Article
Keywords
Conductivity MeasurementsCooper PairEnergy ScaleIron-PnictideMagnetic CorrelationOptical ConductivityPseudo-GapSeparationSingle CrystalsSuperconductivityTemperature EvolutionTheoretical Calculations
ISSN
1367-2630
Abstract
We report the observation of pseudogap (PG) behavior in optical conductivity in an underdoped Ba 0.6+δK 0.4-δFe 2As 2 (T c onsetc≈ 36 K) single crystal far above T c, up to 100K (≈ 3T c). Wide separation of the energy scales of the magnetic and superconducting (SC) correlations in the Ba 0.6+δK 0.4-δFe 2As 2 sample enabled us to establish that the PG structures observed in optical conductivity in the range of 50-150 cm -1 are uniquely driven by the SC correlation, and the magnetic correlation coexists in the far separated range of about 700 cm -1. Theoretical calculations, based on the preformed Cooper pair model, provided an excellent description of the temperature evolution of the SC correlation in optical conductivity data from below to above T c. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.
URI
http://hdl.handle.net/20.500.11750/5356
DOI
10.1088/1367-2630/14/6/063009
Publisher
Institute of Physics Publishing
Related Researcher
  • Author Kwon, Yong Seung Quantum Functional Materials Laboratory
  • Research Interests High Tc Superconductors and magnetic materials; Thermoelectric Materials
Files:
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Collection:
Department of Emerging Materials ScienceQuantum Functional Materials Laboratory1. Journal Articles


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