Structure and magnetism of the Rh4+-containing perovskite oxides La0.5Sr0.5Mn0.5Rh0.5O3 and La0.5Sr0.5Fe0.5Rh0.5O3

被引：2
|
作者：
Hasanli, Nijat [1 ]
Scrimshire, Alex [2 ]
Bingham, Paul A. [2 ]
Palgrave, Robert G. [3 ]
Hayward, Michael A. [1 ]
机构：
[1] Univ Oxford, Dept Chem, Inorgan Chem Lab, South Parks Rd, Oxford OX1 3QR, England
[2] Sheffield Hallam Univ, Mat & Engn Res Inst, City Campus,Howard St, Sheffield S1 1WB, S Yorkshire, England
[3] UCL, Dept Chem, 20 Gordon St, London WC1H 0AJ, England
来源：
DALTON TRANSACTIONS | 2020年 / 49卷 / 32期
关键词：
SPIN-GLASS BEHAVIOR; MAGNETORESISTANCE; TEMPERATURE;
D O I：
10.1039/d0dt02466j
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
Synchrotron X-ray powder diffraction data indicate that La0.5Sr0.5Mn0.5Rh0.5O3 and La0.5Sr0.5Fe0.5Rh0.5O3 adopt distorted perovskite structures (space groupPnma) with A-site and B-site cation disorder. A combination of XPS and Fe-57 Mossbauer data indicate the transition metal cations in the two phases adopt Mn3+/Rh4+ and Fe3+/Rh4+ oxidation state combinations respectively. Transport data indicate both phases are insulating, with rho vs. T dependences consistent with 3D variable-range hopping. Magnetisation data reveal that La0.5Sr0.5Mn0.5Rh0.5O3 adopts a ferromagnetic state below T-c similar to 60 K, which is rationalized on the basis of coupling via a dynamic Jahn-Teller distortion mechanism. In contrast, magnetic data reveal La0.5Sr0.5Fe0.5Rh0.5O3 undergoes a transition to a spin-glass state at T similar to 45 K, attributed to frustration between nearest-neighbour Fe-Rh and next-nearest-neighbour Fe-Fe couplings.
引用
收藏
页码：11346 / 11353
页数：8
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