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J. Phys. Soc. Jpn. 77 (2008) 103706 (3 pages)  |Previous Article| |Next Article|  |Table of Contents|
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Spin Ordering in LaFeAsO and Its Suppression in Superconductor LaFeAsO0.89F0.11 Probed by Mössbauer Spectroscopy

Shinji Kitao1,2, Yasuhiro Kobayashi1,2, Satoshi Higashitaniguchi1,2, Makina Saito1,2, Yoichi Kamihara3, Masahiro Hirano3, Takaya Mitsui2,4, Hideo Hosono3,5,6, and Makoto Seto1,2,4

1Research Reactor Institute, Kyoto University, Kumatori, Osaka 590-0494
2CREST, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012
3ERATO-SORST, JST, c/o Frontier Research Center, Tokyo Institute of Technology, Yokohama 226-8503
4Japan Atomic Energy Agency, Sayo, Hyogo 679-5148
5Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503
6Frontier Research Center, Tokyo Institute of Technology, Yokohama 226-8503

(Received April 30, 2008; Accepted August 11, 2008; Published October 10, 2008)

57Fe Mössbauer spectroscopy was applied to an iron-based layered superconductor LaFeAsO0.89F0.11 with a transition temperature of 26 K and to its parent material LaFeAsO. Throughout the temperature range from 4.2 to 298 K, a singlet pattern with no magnetic splitting was observed in the Mössbauer spectrum of the F-doped superconductor. Furthermore, no additional internal magnetic field was observed for the spectrum measured at 4.2 K under a magnetic field of 7 T. On the other hand, magnetically split spectra were observed in the parent LaFeAsO below 140 K, and this temperature is slightly lower than that of a structural phase transition from tetragonal to orthorhombic phase, which accompanies the electrical resistivity anomaly at around 150 K. The magnetic moment is estimated to be ∼0.35 µB/Fe from the internal magnetic field of 5.3 T at 4.2 K in the orthorhombic phase, and the spin disorder appears to remain in the magnetically ordered state even at 4.2 K. The lack of a magnetic transition in LaFeAsO0.89F0.11 down to 4.2 K suggests that this system exhibits a paramagnetic state or that the magnetic moment is small. The present results show that F doping effectively suppresses the magnetic and structural transitions in the parent material, leading to the emergence of superconductivity in the F-doped system. ©2008 The Physical Society of Japan

KEYWORDS: 57Fe Mössbauer spectroscopy, LaFeAsO, LaFeAsO1-xFx, F doping, superconductivity, magnetic moment
URL: http://jpsj.ipap.jp/link?JPSJ/77/103706/
DOI: 10.1143/JPSJ.77.103706


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