通过金属-绝缘转变观察 NaOsO_{3} 中磁激发的演化。
Evolution of the Magnetic Excitations in NaOsO_{3} through its Metal-Insulator Transition.
机构信息
London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom.
Laboratory for Quantum Magnetism, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne CH-1015, Switzerland.
出版信息
Phys Rev Lett. 2018 Jun 1;120(22):227203. doi: 10.1103/PhysRevLett.120.227203.
The temperature dependence of the excitation spectrum in NaOsO_{3} through its metal-to-insulator transition (MIT) at 410 K has been investigated using resonant inelastic x-ray scattering at the Os L_{3} edge. High-resolution (ΔE∼56 meV) measurements show that the well-defined, low-energy magnons in the insulating state weaken and dampen upon approaching the metallic state. Concomitantly, a broad continuum of excitations develops which is well described by the magnetic fluctuations of a nearly antiferromagnetic Fermi liquid. By revealing the continuous evolution of the magnetic quasiparticle spectrum as it changes its character from itinerant to localized, our results provide unprecedented insight into the nature of the MIT in NaOsO_{3} [J. G. Vale, S. Calder, C. Donnerer, D. Pincini, Y. G. Shi, Y. Tsujimoto, K. Yamaura, M. M. Sala, J. van den Brink, A. D. Christianson, and D. F. McMorrow, Phys. Rev. B 97, 184429 (2018)PRBMDO2469-995010.1103/PhysRevB.97.184429].
利用 Os L_{3} 边缘的共振非弹性 X 射线散射研究了 NaOsO_{3} 在 410 K 金属-绝缘相变（MIT）过程中激发谱的温度依赖性。高分辨率（ΔE∼56 meV）测量表明，在接近金属态时，绝缘态中定义明确、低能磁振子会减弱和阻尼。同时，会发展出一个宽的激发连续谱，其很好地描述了近反铁磁费米液体的磁涨落。通过揭示在其性质从巡游到局域化的连续演变过程中，磁准粒子谱的连续演化，我们的结果为理解 NaOsO_{3} 中的 MIT 本质提供了前所未有的洞察力[J. G. Vale, S. Calder, C. Donnerer, D. Pincini, Y. G. Shi, Y. Tsujimoto, K. Yamaura, M. M. Sala, J. van den Brink, A. D. Christianson, and D. F. McMorrow, Phys. Rev. B 97, 184429 (2018)PRBMDO2469-995010.1103/PhysRevB.97.184429]。
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