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J. Phys. Soc. Jpn. 79 (2010) 113702 (4 pages)  |Previous Article| |Next Article|  |Table of Contents|
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Investigation of the Spin-Glass Regime between the Antiferromagnetic and Superconducting Phases in Fe1+ySexTe1-x

Naoyuki Katayama, Sungdae Ji, Despina Louca, Seunghun Lee, Masaki Fujita1, Taku J. Sato2, Jinsheng Wen3, Zhijun Xu3, Genda Gu3, Guangyong Xu3, Ziwei Lin3, Masanori Enoki1, Sung Chang4, Kazuyoshi Yamada1, and John M. Tranquada2

Department of Physics, University of Virginia, Charlottesville, VA 22904, U.S.A.
1Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
2The Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
3Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973, U.S.A.
4NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, U.S.A.

(Received August 20, 2010; Accepted September 9, 2010; Published October 25, 2010)

Using bulk magnetization along with elastic and inelastic neutron scattering techniques, we have investigated the phase diagram of Fe1+ySexTe1-x and the nature of magnetic correlations in three nonsuperconducting samples of Fe1.01Se0.1Te0.9, Fe1.01Se0.15Te0.85, and Fe1.02Se0.3Te0.7. A cusp and hysteresis in the temperature dependence of the magnetization for the x=0.15 and 0.3 samples indicates spin-glass (SG) ordering below Tsg = 23 K. Neutron scattering measurements indicate that the spin-glass behavior is associated with short-range spin density wave (SDW) ordering characterized by a static component and a low-energy dynamic component with a characteristic incommensurate wave vector of Qm = (0.46, 0, 0.50) and an anisotropy gap of ∼2.5 meV. Our high Q-resolution data also show that the systems undergo a glassy structural distortion that coincides with the short-range SDW order. ©2010 The Physical Society of Japan

URL: http://jpsj.ipap.jp/link?JPSJ/79/113702/
DOI: 10.1143/JPSJ.79.113702


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