Chin. Phys. Lett.  2011, Vol. 28 Issue (8): 086104    DOI: 10.1088/0256-307X/28/8/086104
CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
A Novel Large Moment Antiferromagnetic Order in K0.8Fe1.6Se2 Superconductor
BAO Wei1**, HUANG Qing-Zhen2, CHEN Gen-Fu1, M. A. Green2,3, WANG Du-Ming, HE Jun-Bao, QIU Yi-Ming2,3
1Department of Physics, Renmin University of China, Beijing 100872
2NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
3Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA
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Abstract The discovery of cuprate high TC superconductors has inspired the search for unconventional superconductors in magnetic materials. A successful recipe has been to suppress long−range order in a magnetic parent compound by doping or high pressure to drive the material towards a quantum critical point. We report an exception to this rule in the recently discovered potassium iron selenide. The superconducting composition is identified as the iron vacancy ordered K0.83(2)Fe1.64(1)Se2 with TC above 30 K. A novel large moment 3.31 μB/Fe antiferromagnetic order that conforms to the tetragonal crystal symmetry has an unprecedentedly high ordering temperature TN≈559 K for a bulk superconductor. Staggeringly polarized electronic density of states is thus suspected, which would stimulate further investigation into superconductivity in a strong spin-exchange field under new circumstances.
Keywords: 61.05.Fm      78.70.Nx      74.70.-b     
Received: 06 July 2011      Published: 28 July 2011
PACS:  61.05.fm (Neutron diffraction)  
  78.70.Nx (Neutron inelastic scattering)  
  74.70.-b (Superconducting materials other than cuprates)  
Cite this article:   
BAO Wei, HUANG Qing-Zhen, CHEN Gen-Fu et al  2011 Chin. Phys. Lett. 28 086104
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http://cpl.iphy.ac.cn/10.1088/0256-307X/28/8/086104       OR      http://cpl.iphy.ac.cn/Y2011/V28/I8/086104
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BAO Wei
HUANG Qing-Zhen
CHEN Gen-Fu
M. A. Green
WANG Du-Ming
HE Jun-Bao
QIU Yi-Ming
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