Effect of K Doping on Phonons in Ba1-xKxFe2As2
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概要
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The lattice dynamics of Ba1-xKxFe2As2 ($x=0.00, 0.27$) have been studied by inelastic X-ray scattering measurement at room temperature. K doping induces the softening and broadening of phonon modes in the energy range $E=10--15$ meV. Analysis with a Born–von Kármán force-constant model indicates that the softening results from reduced interatomic force constants around (Ba,K) sites following the displacement of divalent Ba by monovalent K. The phonon broadening may be explained by the local distortions induced by the K substitution. Extra phonon modes are observed around the wave vector $\mathbf{q}=(0.5,0,0)$ at $E=16.5$ meV for the $x=0.27$ sample. These modes may arise either from the local disorder induced by K doping or from electron–phonon coupling.
- 2010-01-15
著者
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Braden Markus
Ii. Physikalisches Institut Universitat Zu Koln
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TSUTSUI Satoshi
Research and Utilization Division, SPring-8 JASRI
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EISAKI Hiroshi
National Institute of Advanced Industrial Science and Technology
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LEE Chul-Ho
National Institute of Advanced Industrial Science and Technology
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KIHOU Kunihiro
National Institute of Advanced Industrial Science and Technology
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HORIGANE Kazumasa
WPI, Tohoku University
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FUKUDA Tatsuo
JST, Transformative Research-Project on Iron Pnictides (TRIP)
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YAMAGUCHI Hirotaka
National Institute of Advanced Industrial Science and Technology
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BARON Alfred
JST, Transformative Research-Project on Iron Pnictides (TRIP)
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YAMADA Kazuyoshi
WPI, Tohoku University
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Tsutsui Satoshi
Japan Synchrotron Radiation Res. Inst. Hyogo Jpn
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Tsutsui Satoshi
Japan Synchrotron Radiation Research Institute Spring-8
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Iyo Akira
National Inst. Advanced Industrial Sci. And Technol. (aist) Ibaraki Jpn
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Tsutsui Satoshi
Japan Synchrotron Radiation Research Institute
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Yamada Kazuyoshi
WPI, Tohoku University, Sendai 980-8577, Japan
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Baron Alfred
JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan
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Tsutsui Satoshi
Japan Synchrotron Radiation Research Institute, SPring-8, Hyogo 679-5198, Japan
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Tsutsui Satoshi
SPring-8/JASRI, Sayo, Hyogo 679-5198, Japan
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Fukuda Tatsuo
JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan
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Braden Markus
II. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, D-50937 Köln, Germany
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Yamaguchi Hirotaka
National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan
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