首页> 中文期刊> 《中国物理快报:英文版》 >A Novel Large Moment Antiferromagnetic Order in K_(0.8)Fe_(1.6)Se_(2) Superconductor

A Novel Large Moment Antiferromagnetic Order in K_(0.8)Fe_(1.6)Se_(2) Superconductor

         

摘要

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 K_(0.83)(2)Fe_(1.64)(1)Se_(2) with T_(C) above 30 K.A novel large moment 3.31μB/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.

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