期刊
CHINESE PHYSICS LETTERS
卷 28, 期 8, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0256-307X/28/8/086104
关键词
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资金
- National Natural Science Foundation of China [11034012, 10834013, 10974254]
- National Basic Research Program of China [2011CBA00112, 2010CB923000, 2009CB009100]
The discovery of cuprate high T-C 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 T-C above 30K. A novel large moment 3.31 mu(B)/Fe antiferromagnetic order that conforms to the tetragonal crystal symmetry has an unprecedentedly high ordering temperature T-N approximate to 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.
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