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 Fujita, Taku J. Sato, Jinsheng Wen, Zhijun Xu, Genda Gu, Guangyong Xu, Ziwei Lin, Masanori Enoki, Sung Chang, Kazuyoshi Yamada, John M. Tranquada

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98 Citations (Scopus)


Using bulk magnetization along with elastic and inelastic neutron scattering techniques, we have investigated the phase diagram of Fe 1+ySexTe1-x and the nature of magnetic correlations in three nonsuperconducting samples of Fe1.01Se 0.1Te0.9, Fe1.01Se0.15Te 0.85, 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.

Original languageEnglish
Article number113702
JournalJournal of the Physical Society of Japan
Issue number11
Publication statusPublished - 2010 Nov


  • Fe based superconductivity
  • Fe(Se,Te)
  • Neutron scattering
  • Phase diagram
  • Spin glass


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