High pressure synthesis, physical properties and electronic structure of monovalent iron compound LaFePH

High pressure synthesis, physical properties and electronic structure of monovalent iron compound LaFePH
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一价铁化合物LaFePH的高压合成、物理性质及电子结构

DOI:
10.1016/j.jssc.2022.123546
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发表时间:
2022
影响因子:
3.3
通讯作者:
Hideo Hosono
Hideo Hosono
中科院分区:
化学3区
文献类型:
--
作者:
Soshi Iimura;Takashi Sasaki;Kota Hanzawa;Satoru Matsuishi;Hideo Hosono

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利用高压合成技术,在高氢分压条件下,我们合成了一种新的铁基超导体LaFePH的类似物,其形式铁电荷为1+和新的氧化物LaFePO 1 − xHx,x范围为0 < x < 1。与类似的砷化物LaFeAsO 1 − xHx和等电子Co-oxyphosphide LaCoPO相比,LaFePO 1 − xHx中除了已知的x = 0的超导转变外,没有观察到超导、磁性或结构转变。DFT计算表明,氢离子取代氧位使Fe-3d掺杂电子,提高费米能级,导致部分电子从Fe-3d转移到La-5d.我们属性的磁性LaFePH的减少现场库仑相互作用的Fe-3d轨道由于3d轨道的扩展和La-5d电子的屏蔽效应。
Using high pressure synthesis under high hydrogen partial pressure condition, we synthesized a new analogue of iron-based superconductors LaFePH with a formal iron charge of 1+ and new oxyhydrides LaFePO1−xHxwithxranging 0 ​< ​x​< ​1. In contrast to the analogous arsenides LaFeAsO1−xHxand isoelectronic Co-oxyphosphide LaCoPO, neither superconducting, magnetic nor structural transitions were observed in LaFePO1−xHxexcept the already known superconducting transition inx​= ​0. DFT calculations reveal that the hydride ion substitution for the oxygen site dopes electrons into the Fe-3d and raises the Fermi level, leading to a partial electron transfer from the Fe-3d to La-5d. We attribute the absence of magnetism in LaFePH to the reduced onsite Coulomb interaction in the Fe-3d orbitals due to the expansion of the 3d orbital and the shielding effect of La-5d electrons.
DOI: --
发表时间: 2013-09
期刊: Japanese journal of applied physics : JJAP
影响因子: --
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