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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 |
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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.
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Received: 12 March 2012
Revised: 23 March 2012
Accepted manuscript online:
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PACS:
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74.70.Xa
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(Pnictides and chalcogenides)
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63.20.-e
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(Phonons in crystal lattices)
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78.30.-j
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(Infrared and Raman spectra)
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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
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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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[1] |
Kamihara Y, Watanabe T, Hirano M and Hosono H 2008 J. Am. Chem. Soc. 130 3296
|
[2] |
Rotter M, Tegel M and Johrendt D 2008 Phys. Rev. Lett. 101 107006
|
[3] |
Sefat A S, Jin R, McGuire M A, Sales B C, Singh D J and Mandrus D 2008 Phys. Rev. Lett. 101 117004
|
[4] |
Tapp J H, Tang Z, Lv B, Sasmal K, Lorenz B, Chu P C W and Guloy A M 2008 Phys. Rev. B 78 060505
|
[5] |
Parker D R, Pitcher M J, Baker P J, Franke I, Lancaster T, Blundell S J and Clarke S J 2009 Chem. Commun. 16 2189
|
[6] |
Hsu F C, Luo J Y, Yeh K W, Chen T K, Huang T W, Wu P M, Lee Y C, Huang Y L, Chu Y Y, Yan D C and Wu M K 2008 Proc. Natl. Acad. Sci. USA 105 14262
|
[7] |
Fang M H, Pham H M, Qian B, Liu T J, Vehstedt E K, Liu Y, Spinu L and Mao Z Q 2008 Phys. Rev. B 78 224503
|
[8] |
Zhu X Y, Han F, Mu G, Zeng B, Cheng P, Shen B and Wen H H 2009 Phys. Rev. B 79 024516
|
[9] |
Zhu X Y, Han F, Mu G, Cheng P, Shen B, Zeng B and Wen H H 2009 Phys. Rev. B 79 220512
|
[10] |
Rotter M, Tegel M, Johrendt D, Schellenberg I, Hermes W and Pöttgen R 2008 Phys. Rev. B 78 020503
|
[11] |
Li L J, Luo Y K, Wang Q B, Chen H, Ren Z, Tao Q, Li Y K, Lin X, He M, Zhu Z W, Cao G H and Xu Z A 2009 New J. Phys. 11 025008
|
[12] |
Akrap A, Tu J J, Li L J, Cao G H, Xu Z A and Homes C C 2009 Phys. Rev. B 80 180502
|
[13] |
Ma J Y, Fang X, Muhammad K, Zhao H Y, Bi C Z, Zhao B R and Qiu X G 2008 Chin. Phys. B 17 3313
|
[14] |
Lobo R P S M, Moreira R L, Lebeugle D and Colson D 2007 Phys. Rev. B 76 172105
|
[15] |
Luo H Q, Wang Z S, Yang H, Cheng P, Zhu X Y and Wen H H 2008 Superconductor Science and Technology 21 125014
|
[16] |
Homes C C, Reedyk M, Cradles D A and Timusk T 1993 Appl. Opt. 32 2976
|
[17] |
Li G, Hu W Z, Dong J, Li Z, Zheng P, Chen G F, Luo J L and Wang N L 2008 Phys. Rev. Lett. 101 107004
|
[18] |
Charnukha A, Dolgov O V, Golubov A A, Matiks Y, Sun D L, Lin C T, Keimer B and Boris A V 2011 Phys. Rev. B 84 174511
|
[19] |
Fano U 1961 Phys. Rev. 124 1866
|
[20] |
Menéndez J and Cardona M 1984 Phys. Rev. B 29 2051
|
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