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Superconductivity Tuned by the Iron Vacancy Order in K_(x)Fe_(2−y)Se_(2)
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作者 BAO Wei LI Guan-Nan +7 位作者 HUANG Qing-Zhen CHEN Gen-Fu HE Jun-Bao WANG Du-Ming magreen QIU Yi-Ming LUO Jian-Lin WU Mei-Mei 《Chinese Physics Letters》 SCIE CAS CSCD 2013年第2期198-201,共4页
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 ... 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 16i and vacancy 4d sites across the phase-diagram of K_(x)Fe_(2)-ySe_(2).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. 展开更多
关键词 phase. VACANCY METALLIC
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A Novel Large Moment Antiferromagnetic Order in K_(0.8)Fe_(1.6)Se_(2) Superconductor 被引量:4
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作者 BAO Wei HUANG Qing-Zhen +4 位作者 CHEN Gen-Fu magreen WANG Du-Ming HE Jun-Bao QIU Yi-Ming 《Chinese Physics Letters》 SCIE CAS CSCD 2011年第8期213-216,共4页
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... 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. 展开更多
关键词 materials SUPERCONDUCTORS FERROMAGNETIC
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