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arXiv 0908.4169cond-mat.str-elcond-mat.mtrl-sci
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阻挫金属反铁磁体2 H- AgNiO2中定域d电子与巡游d电子的相互作用

Interplay between localized and itinerant d electrons in a frustrated metallic antiferromagnet, 2H-AgNiO2

A. I. Coldea, A. Carrington, R. Coldea, L. Malone, A. F. Bangura, M. D. Johannes, I. I. Mazin, E. A. Yelland, J. G. Analytis, J. A. A. J. Perenboom, C. Jaudet, … 展开作者

A. I. Coldea, A. Carrington, R. Coldea, L. Malone, A. F. Bangura, M. D. Johannes, I. I. Mazin, E. A. Yelland, J. G. Analytis, J. A. A. J. Perenboom, C. Jaudet, D. Vignolles, T. Sorgel, M. Jansen

摘要:

利用热力学和输运测量方法研究了高磁场(54 T)下阻挫三角形金属反铁磁体2 H-AgNiO 2的电子和磁性行为.在这里,局域d电子被安排在反铁磁三角晶格嵌套在蜂窝晶格与巡回d电子。当磁场沿易磁化轴时,我们观察到一系列的场致跃迁,这归因于易磁化轴各向异性、几何阻挫以及局域和巡回系统的耦合之间的竞争.量子振荡的数据表明,费米面是由磁序重建,但在高磁场磁击穿轨道是可能的。巡游电子对自旋涨落的散射非常敏感,并发现了显著的质量增强(~ 3)。

英文摘要:

We report the electronic and magnetic behaviour of the frustrated triangular metallic antiferromagnet 2H-AgNiO2 in high magnetic fields (54 T) using thermodynamic and transport measurements. Here localized d electrons are arranged on an antiferromagnetic triangular lattice nested inside a honeycomb lattice with itinerant d electrons. When the magnetic field is along the easy axis we observe a cascade of field-induced transitions, attributed to the competition between easy-axis anisotropy, geometrical frustration and coupling of the localized and itinerant system. The quantum oscillations data suggest that the Fermi surface is reconstructed by the magnetic order but in high fields magnetic breakdown orbits are possible. The itinerant electrons are extremely sensitive to scattering by spin fluctuations and a significant mass enhancement (~ 3) is found.

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