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Chin. Phys. B, 2012, Vol. 21(7): 077403    DOI: 10.1088/1674-1056/21/7/077403

Evolution of the 251 cm-1 infrared phonon mode with temperature in Ba0.6K0.4Fe2As2

Dai Yao-Min(戴耀民)a)b), Xu Bing(许兵)a)b), Shen Bing(沈冰)a), Xiao Hong(肖宏)a), Lobo R. P. S. Mb), and Qiu Xiang-Gang(邱祥冈)a)†
a Beijing National Laboratory for Condensed Matter Physics, National Laboratory for Superconductivity, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
b LPEM, ESPCI-ParisTech, CNRS, UPMC, 10 rue Vauquelin, F-75231 Paris Cedex 5, France
Abstract  The far-infrared optical reflectivity of optimally doped Ba1-xKxFe2As2 (x = 0.4) single crystal is measured from room temperature down to 4 K. We study the temperature dependence of the in-plane infrared-active phonon at 251 cm-1. This phonon exhibits a symmetric line shape in the optical conductivity, suggesting that the coupling between the phonon and the electronic background is weak. Upon cooling down, the frequency of this phonon continuously increases, following the conventional temperature dependence expected in the absence of a structural or magnetic transition. The intensity of this phonon is temperature independent within the measurement accuracy. These observations indicate that the structural and magnetic phase transition might be completely suppressed by the chemical doping in the optimally doped Ba0.6K0.4Fe2As2 compound.
Keywords:  iron-based superconductor      phonon mode      infrared spectroscopy  
Received:  12 March 2012      Revised:  23 March 2012      Accepted manuscript online: 
PACS:  74.70.Xa (Pnictides and chalcogenides)  
  63.20.-e (Phonons in crystal lattices)  
  78.30.-j (Infrared and Raman spectra)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11104335 and 91121004), the National Basic Research Program of China (Grant Nos. 2011CBA00107, 2012CB821400, and 2009CB929102), and the ANR, France (Grant No. BLAN07-1-183876 GAPSUPRA).
Corresponding Authors:  Qiu Xiang-Gang     E-mail:

Cite this article: 

Dai Yao-Min(戴耀民), Xu Bing(许兵), Shen Bing(沈冰), Xiao Hong(肖宏), Lobo R. P. S. M, and Qiu Xiang-Gang(邱祥冈) Evolution of the 251 cm-1 infrared phonon mode with temperature in Ba0.6K0.4Fe2As2 2012 Chin. Phys. B 21 077403

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