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arXiv 0808.2898cond-mat.str-elcond-mat.mtrl-sci
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Gd2PdSi3和Tb2PdSi3中磁有序传播矢量处RKKY相互作用的电子结构和嵌套驱动增强

Electronic structure and nesting-driven enhancement of the RKKY interaction at the magnetic ordering propagation vector in Gd2PdSi3 and Tb2PdSi3

D. S. Inosov, D. V. Evtushinsky, A. Koitzsch, V. B. Zabolotnyy, S. V. Borisenko, A. A. Kordyuk, M. Frontzek, M. Loewenhaupt, W. Loeser, I. Mazilu, H. Bitterlich… 展开作者

D. S. Inosov, D. V. Evtushinsky, A. Koitzsch, V. B. Zabolotnyy, S. V. Borisenko, A. A. Kordyuk, M. Frontzek, M. Loewenhaupt, W. Loeser, I. Mazilu, H. Bitterlich, G. Behr, J. -U. Hoffmann, R. Follath, B. Buechner

摘要:

利用角分辨光电子能谱学(ARPES)首次测量了金属间化合物Gd_2 PdSi_3和Tb_2 PdSi_3的费米面和低能电子结构。这两种材料都具有花状费米表面,其由G点处的电子桶组成,所述电子桶由源自相同能带的纺锤形电子袋包围。这两个功能的带底位于费米能级以下0.5 eV。从实验测量的能带结构,我们估计的动量依赖的RKKY耦合强度,并证明它是峰值的1/2 GK波矢。与来自相同晶体的中子衍射数据的比较表明,该矢量与低温面内磁序的传播矢量完全一致,从而证明了费米面几何在解释三元稀土硅化物的复杂磁序基态中的决定性作用。

英文摘要:

We present first-time measurements of the Fermi surface and low-energy electronic structure of intermetallic compounds Gd2PdSi3 and Tb2PdSi3 by means of angle-resolved photoelectron spectroscopy (ARPES). Both materials possess a flower-like Fermi surface consisting of an electron barrel at the G point surrounded by spindle-shaped electron pockets originating from the same band. The band bottom of both features lies at 0.5 eV below the Fermi level. From the experimentally measured band structure, we estimate the momentum-dependent RKKY coupling strength and demonstrate that it is peaked at the 1/2 GK wave vector. Comparison with neutron diffraction data from the same crystals shows perfect agreement of this vector with the propagation vector of the low-temperature in-plane magnetic order, thereby demonstrating the decisive role of the Fermi surface geometry in explaining the complex magnetically ordered ground state of ternary rare earth silicides.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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