Journal
CHINESE PHYSICS B
Volume 21, Issue 7, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1674-1056/21/7/077403
Keywords
iron-based superconductor; phonon mode; infrared spectroscopy
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Funding
- National Natural Science Foundation of China [11104335, 91121004]
- National Basic Research Program of China [2011CBA00107, 2012CB821400, 2009CB929102]
- ANR, France [BLAN07-1-183876 GAPSUPRA]
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The far-infrared optical reflectivity of an 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 chemical doping in the optimally doped Ba0.6K0.4Fe2As2 compound.
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