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首页> 外文期刊>Physica status solidi, B. Basic research >Magnetic and optical properties of single crystals of transition metal doped ZnO
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Magnetic and optical properties of single crystals of transition metal doped ZnO

机译：过渡金属掺杂ZnO单晶的磁和光学性质

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Considerable effort has been devoted to the study of transition metal doped zinc oxide following various theoretical predictions of room temperature ferromagnetism in these materials. Near equilibrium growth techniques may be suitable for the production of dilute transition metal doped ZnO because the transition metal solubility in ZnO can be relatively high. This work reports on the optical, structural, and magnetic properties of single crystals of Co- and Mn-doped ZnO grown by a modified melt-growth technique. X-ray diffraction reveals that the as grown crystals are pure single crystals with no second phases. Mn doping up to 5% results in an increase in c-axis lattice parameter (5.207 A to 5.211 A), and X-ray linewidths (78 arcsec to 252 arcsec) at doping levels of 5% Mn. Optical transmission shows distinct absorption spectra related to the color of the Zn1-x TMx O sample resulting from interatomic transitions within the divalent transition metal ion. Electron paramagnetic resonance confirms the divalent nature of the substitutional transition metal ions. Raman spectroscopy shows the predominantly the E2 (high) peak at 407 cm-1, but with increasing doping shows additional disorder-related modes. The magnetic behavior reveals a paramagnetic behavior at all temperatures for both Mn- and Co-doped ZnO up to transition metal doping levels of 5% and 3% respectively. The dominant exchange mechanism in the Mn- and Co-doped ZnO crystals is found to be antiferromagnetic superexchange.
机译：在对这些材料中室温铁磁性的各种理论预测之后，已经投入了大量的精力来研究过渡金属掺杂的氧化锌。由于过渡金属在ZnO中的溶解度可能较高，因此近平衡生长技术可能适合于稀过渡金属掺杂的ZnO的生产。这项工作报告了通过改良的熔体生长技术生长的Co和Mn掺杂的ZnO单晶的光学，结构和磁性。 X射线衍射表明，所生长的晶体是没有第二相的纯单晶。 Mn掺杂达5％会导致c轴晶格参数（5.207 A至5.211 A）增加，并且在5％Mn的掺杂水平下X射线线宽（78 arcsec至252 arcsec）会增加。光学透射显示与二价过渡金属离子内的原子间跃迁有关的，与Zn1-x TMx O样品的颜色有关的独特吸收光谱。电子顺磁共振证实了取代过渡金属离子的二价性质。拉曼光谱法主要显示407 cm-1处的E2（高）峰，但随着掺杂的增加，显示出其他与疾病相关的模式。磁性行为揭示了在所有温度下，Mn和Co掺杂的ZnO的顺磁行为分别达到5％和3％的过渡金属掺杂水平。发现Mn和Co掺杂的ZnO晶体中的主要交换机制是反铁磁超交换。

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