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

doi:10.1088/1674-1056/21/7/077403

Abstract The far-infrared optical reflectivity of optimally doped Ba_1-xK_xFe₂As₂ (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 Ba_0.6K_0.4Fe₂As₂ 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: xgqiu@iphy.ac.cn

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 Ba_0.6K_0.4Fe₂As₂ 2012 Chin. Phys. B 21 077403

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

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Evolution of the 251 cm^-1 infrared phonon mode with temperature in Ba_0.6K_0.4Fe₂As₂