| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Superconductivity Tuned by the Iron Vacancy Order in KxFe2?ySe2 |
| BAO Wei1**, LI Guan-Nan2,3, HUANG Qing-Zhen2, CHEN Gen-Fu1, HE Jun-Bao1, WANG Du-Ming1, M. A. Green2,4, QIU Yi-Ming2,4, LUO Jian-Lin3, WU Mei-Mei5 |
1Department of Physics, Renmin University of China, Beijing 100872
2NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
3Institute of Physics, Chinese Academy of Sciences, Beijing 100190
4Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA
5Neutron Scattering Laboratory, China Institute of Atomic Energy, Beijing 102413
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| Cite this article: |
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BAO Wei, LI Guan-Nan, HUANG Qing-Zhen et al 2013 Chin. Phys. Lett. 30 027402 |
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Abstract Combining in-depth neutron diffraction and systematic bulk studies, we discover that the √5×√5 Fe vacancy order, with its associated block antiferromagnetic order, is the ground state with varying occupancy ratios of the iron 16#em/em# and vacancy 4d sites across the phase-diagram of KxFe2?ySe2. The orthorhombic order, with one of the four Fe sites vacant, appears only at intermediate temperatures as a competing phase. The material experiences an insulator to metal crossover when the √5×√5 order is highly developed. Superconductivity occurs in such a metallic phase.
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Received: 24 December 2012
Published: 02 March 2013
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| PACS: |
74.70.Xa
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(Pnictides and chalcogenides)
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74.25.Ha
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(Magnetic properties including vortex structures and related phenomena)
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75.25.-j
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(Spin arrangements in magnetically ordered materials (including neutron And spin-polarized electron studies, synchrotron-source x-ray scattering, etc.))
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75.30.-m
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(Intrinsic properties of magnetically ordered materials)
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Abstract
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