A Novel Large Moment Antiferromagnetic Order in K 0.8 Fe 1.6 Se 2 Superconductor

2011/02/04 by Wei Bao, Q. Huang, Genfu Chen +9 · 11 citations
Biochemistry, Genetics and Molecular Biology · Chemistry · Materials Science · Physics and Astronomy · #Amyloidosis: Diagnosis, Treatment, Outcomes #Antiferromagnetism #Chemistry #Condensed matter physics #Crystal structure #Crystallography #Cuprate #Iron-based superconductors research #Magnetic moment #Materials science #Physics #Pnictogen #Rare-earth and actinide compounds #Selenide #Superconductivity #Tetragonal crystal system #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1088/0256-307x/28/8/086104

published as Chinese Phys. Lett. 28, 086104 (2011) · 5 figures, 5 pages, and 2 tables in pdf which arXiv.com cannot take

arxiv created 2011/02/04 · openalex publication_date 2011/08/01 · arxiv updated 2015/03/18 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06

Abstract

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 K 0.83(2) Fe 1.64(1) Se 2 with T C above 30 K. A novel large moment 3.31 μ B /Fe antiferromagnetic order that conforms to the tetragonal crystal symmetry has an unprecedentedly high ordering temperature T N ≈ 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.

Citations

• Crystal Structure and Antiferromagnetic Order inNdFeAsO1−xFx(x=0.0and 0.2) Superconducting Compounds from Neutron Diffraction Measurements
• The puzzle of high temperature superconductivity in layered iron pnictides and chalcogenides

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• Exploration of iron-chalcogenide superconductors
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• Universal behavior of the upper critical field in iron-based superconductors
• Observation of universal strong orbital-dependent correlation effects in iron chalcogenides
• Intertwined charge, spin, and pairing orders in doped iron ladders
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