Structural, electronic and magnetic properties of Fe-doped strontium ruthenates  

作　　者：刘楠 王晓超 司良 Nan Liu;Xiao-Chao Wang;Liang Si(School of Physics,Northwest University,Xi’an 710127,China;Institute of Solid State Physics,TU Wien,Vienna 1040,Austria)

机构地区：[1]School of Physics,Northwest University,Xi’an 710127,China [2]Institute of Solid State Physics,TU Wien,Vienna 1040,Austria

出　　处：《Chinese Physics B》2023年第11期96-104,共9页中国物理B（英文版）

基　　金：Project supported by the starting funds from Northwest University。

摘　　要：By employing a combined approach of density-functional theory(DFT) and dynamical mean-field theory(DMFT) calculations, we examine the structural, electronic, and magnetic characteristics of two distinct strontium ruthenates: Sr2RuO4,an unconventional superconductor, and the correlated metal SrRuO3, both at 50% Fe-doping level. In both Sr2Fe0.5Ru0.5O4and SrFe0.5Ru0.5O3, the original ruthenium(Ru) and the dopant iron(Fe) atoms adopt 3-dimensional and 2-dimensional G-type structures, respectively. The hybridization between Fe-3d and Ru-4d is comparatively weaker than in other double perovskite systems. The interplay between strong correlations and reduced itinerancy results in significant spin splitting at Fe and Ru sites. Consequently, a charge transfer process, along with the super-exchange effect, leads to antiferromagnetically coupled Fe3+and Ru5+ions and establishes a semiconducting ferrimagnetic order. Subsequent DMFT calculations demonstrate the persistence of the ferrimagnetic order even at room temperature(300 K). These findings align with prior reports on Sr Fe0.5Ru0.5O3, thus reinforcing the notion that 3d–4d transition metal oxides hold considerable promise as candidates for high-performance spintronic devices, such as spin-valve sensors and spintronic giant magnetoresistance devices.

关 键 词：first-principles calculations double perovskites correlation effects dynamical mean-field theory 

分 类 号：O469[理学—凝聚态物理]