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J. Phys. Soc. Jpn. 79 (2010) 013706 (4 pages)  |Previous Article| |Next Article|  |Table of Contents|
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Observation of Softened Fe Modes in K-Doped BaFe2As2 via 57Fe Nuclear Resonant Inelastic Scattering

Satoshi Tsutsui1, Chul-Ho Lee2,3, Cedric Tassel4, Yoshiyuki Yoshida2, Yoshitaka Yoda1,5, Kunihiro Kihou2,3, Akira Iyo2,3, and Hiroshi Eisaki2,3

1Japan Synchrotron Radiation Research Institute, SPring-8, Sayo, Hyogo 679-5198, Japan
2National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan
3Japan Science and Technology Agency, Transformative Research-Project on Iron Pnictide (TRIP), Chiyoda, Tokyo 102-0075, Japan
4Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
5CREST, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan

(Received October 21, 2009; Accepted November 19, 2009; Published January 12, 2010)

The contribution of Fe atomic motion to the superconductivity in the K-doped BaFe2As2 system was investigated by 57Fe nuclear resonant inelastic scattering. A significant K-doping effect was observed in the Fe partial phonon density of states. The present results indicate that low-lying Fe optical modes are softened by K-doping. This demonstrates that the Fe atomic motion correlates with the superconductivity in K-doped BaFe2As2. ©2010 The Physical Society of Japan

KEYWORDS: BaFe2As2, superconductivity, nuclear resonant inelastic scattering, partial phonon density of states
URL: http://jpsj.ipap.jp/link?JPSJ/79/013706/
DOI: 10.1143/JPSJ.79.013706


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