Breakdown of Hund's rule for CuFeAs

Breakdown of Hund's rule for CuFeAs
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CuFeAs 洪德法则的分解

DOI:
10.1103/physrevb.103.125123
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发表时间:
2021-03
期刊:
影响因子:
3.7
通讯作者:
Zhang Yu-Zhong
Zhang Yu-Zhong
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Song Ze-Yi;Jiang Xiu-Cai;Ouyang Xiao-Fang;Zhang Yu-Zhong

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在广义梯度近似(GGA)和$\ mathm {GGA}+U$中应用密度泛函理论计算研究了CuFeAs的基态性质。我们发现,违反洪德规则的双共线反铁磁态在每个铁上具有反平行轨道磁矩,更有利于现场库仑相互作用,并被Cu空位进一步稳定。磁性基态可以用来理解实验观察到的CuFeAs的弱反铁磁性。我们认为,亨德规则的破坏可能是铁粒子磁性降低的可能原因,而不是由电子相关引起的磁波动。
The ground-state properties of CuFeAs were investigated by applying density functional theory calculations within the generalized gradient approximation (GGA) and $\mathrm{GGA}+U$. We find that the bicollinear antiferromagnetic state with antiparallel orbital magnetic moments on each iron which violates the Hund's rule is favored by the on-site Coulomb interaction, which is further stabilized by Cu vacancy. The magnetic ground state can be used to understand weak antiferromagnetism in CuFeAs observed experimentally. We argue that a breakdown of the Hund's rule may be the possible origin for reduced magnetism in iron pnictides, rather than magnetic fluctuations induced by electronic correlations.
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