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首页> 外文期刊>Physical review >Magnetoelasticity in ACr_2O_4 spinel oxides (A = Mn, Fe, Co, Ni, and Cu)
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Magnetoelasticity in ACr_2O_4 spinel oxides (A = Mn, Fe, Co, Ni, and Cu)

机译:ACr_2O_4尖晶石氧化物(A = Mn,Fe,Co,Ni和Cu)中的磁弹性

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摘要

Dynamical properties of the lattice structure were studied by optical spectroscopy in ACr_2O_4 chromium spinel oxide magnetic semiconductors over a broad temperature region of T = 10-335 K. The systematic change of the A-site ions (A = Mn, Fe, Co, Ni and Cu) showed that the occupancy of 3d orbitals on the A site has strong impact on the lattice dynamics. For compounds with orbital degeneracy (FeCr_2O_4, NiCr_2O_4, and CuCr_2O_4), clear splitting of infrared-active phonon modes and/or activation of silent vibrational modes have been observed upon the Jahn-Teller transition and at the onset of the subsequent long-range magnetic order. Although MnCr_2O_4 and CoCr_2O_4 show multiferroic and magnetoelectric character, no considerable magnetoelasticity was found in spinel compounds without orbital degeneracy as they closely preserve the high-temperature cubic spinel structure even in their magnetic ground state. Aside from lattice vibrations, intra-atomic 3d-3d transitions of the A~(2+) ions were also investigated to determine the crystal field and Racah parameters and the strength of the spin-orbit coupling.
机译:通过光学光谱研究了ACr_2O_4铬尖晶石氧化物磁性半导体在T = 10-335 K的宽温度范围内的晶格结构的动力学特性。A位离子(A = Mn,Fe,Co,Ni的系统变化)和Cu)表明,A位置上3d轨道的占据对晶格动力学有很大影响。对于具有轨道简并性的化合物(FeCr_2O_4,NiCr_2O_4和CuCr_2O_4),在Jahn-Teller跃迁和随后的长距离磁场起初,已观察到红外活性声子模的清晰分裂和/或无声振动模的激活。订购。尽管MnCr_2O_4和CoCr_2O_4具有多铁性和磁电特性,但在没有轨道简并性的尖晶石化合物中未发现相当大的磁弹性,因为它们即使在其磁性基态下也能紧密保留高温立方尖晶石结构。除了晶格振动,还研究了A〜(2+)离子在原子内的3d-3d跃迁,以确定晶体场和Racah参数以及自旋轨道耦合的强度。

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  • 来源
    《Physical review》 |2013年第6期|064416.1-064416.9|共9页
  • 作者单位

    Department of Physics, Budapest University of Technology and Economics and Condensed Matter Research Group of the Hungarian Academy of Sciences, 1111 Budapest, Hungary;

    Department of Physics, Budapest University of Technology and Economics and Condensed Matter Research Group of the Hungarian Academy of Sciences, 1111 Budapest, Hungary Quantum-Phase Electronics Center, Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan;

    Department of Physics, Budapest University of Technology and Economics and Condensed Matter Research Group of the Hungarian Academy of Sciences, 1111 Budapest, Hungary;

    Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences,H-1525 Budapest, Hungary;

    Experimentalphysik 2, Universitaet Augsburg, D-86135 Augspurg, Germany;

    Experimentalphysik 2, Universitaet Augsburg, D-86135 Augspurg, Germany;

    Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan;

    Quantum-Phase Electronics Center, Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan Cross-correlated Materials Group (CMRG) and Correlated Electron Research Group (CERG),RIKEN Advanced Science Institute, Wako 351-0198, Japan;

    Department of Physics, Budapest University of Technology and Economics and Condensed Matter Research Group of the Hungarian Academy of Sciences, 1111 Budapest, Hungary;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    magnetomechanical and magnetoelectric effects; magnetostriction; infrared and raman spectra; phonons in crystal lattices;

    机译:磁机械和磁电效应;磁致伸缩红外和拉曼光谱;晶格中的声子;

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