Tunable (δπ, δπ)-Type Antiferromagnetic Order in α-Fe(Te,Se) Superconductors

Wei Bao, Y. Qiu, Q. Huang, M. A. Green, P. Zajdel, M. R. Fitzsimmons, M. Zhernenkov, S. Chang, Minghu Fang, B. Qian, E. K. Vehstedt, Jinhu Yang, H. M. Pham, L. Spinu, and Z. Q. Mao
Phys. Rev. Lett. 102, 247001 – Published 17 June 2009
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Abstract

The new α-Fe(Te,Se) superconductors share the common iron building block and ferminology with the LaFeAsO and BaFe2As2 families of superconductors. In contrast with the predicted commensurate spin-density-wave order at the nesting wave vector (π, 0), a completely different magnetic order with a composition tunable propagation vector (δπ, δπ) was determined for the parent compound Fe1+yTe in this powder and single-crystal neutron diffraction study. The new antiferromagnetic order survives as a short-range one even in the highest TC sample. An alternative to the prevailing nesting Fermi surface mechanism is required to understand the latest family of ferrous superconductors.

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  • Received 29 September 2008

DOI:https://doi.org/10.1103/PhysRevLett.102.247001

©2009 American Physical Society

Authors & Affiliations

Wei Bao1,2,*, Y. Qiu3,4, Q. Huang3, M. A. Green3,4, P. Zajdel3,5, M. R. Fitzsimmons2, M. Zhernenkov2, S. Chang3, Minghu Fang6,7, B. Qian6, E. K. Vehstedt6, Jinhu Yang7, H. M. Pham8, L. Spinu8, and Z. Q. Mao6

  • 1Department of Physics, Renmin University of China, Beijing 100872, China
  • 2Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
  • 3NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
  • 4Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA
  • 5Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland
  • 6Department of Physics, Tulane University, New Orleans, Louisiana 70118, USA
  • 7Department of Physics, Zhejiang University, Hangzhou 310027, China
  • 8Department of Physics, University of New Orleans, New Orleans, Louisiana 70148, USA

  • *wbao@ruc.edu.cn

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Vol. 102, Iss. 24 — 19 June 2009

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