论文标题
Kitaev Quantum Magnet Alpha-Rucl3的高场热传输特性：临界场以外的低能激发的证据
High-field thermal transport properties of the Kitaev quantum magnet alpha-RuCl3: evidence for low-energy excitations beyond the critical field
论文作者
论文摘要
我们研究了Kitaev量子量磁磁铁的平面内纵向低温电导率Kappa_AB，用于最高33吨的大面积磁场。我们的数据显示，大于关键场Bc〜8 t的磁场的数据显示，磁性顺序被抑制了，这是一个巨大的磁力抑制，对Kappa_ab的巨大提高了Alldmensatiors在所有气氛中的巨大增加。对我们数据的分析表明，声子不仅在相对较大的能量上被磁模式强烈散射，该模式与磁场大致线性地缩放，而且还通过小能量模式，该模式在BC附近出现，并具有平方根样的场依赖性。尽管前者与伽马点处的磁激发光谱的最新旋转波理论（SWT）的结果达到了惊人的一致性，但尽管匹配场的依赖性，后者的能量太小了，无法与M点的SWT指望的磁蛋白间隙兼容。因此，提出了一种基于声子散射随机单词状态的热激发的替代方案。
We investigate the phononic in-plane longitudinal low-temperature thermal conductivity kappa_ab of the Kitaev quantum magnet alpha-RuCl3 for large in-plane magnetic fields up to 33 T. Our data reveal for fields larger than the critical field Bc ~ 8 T, at which the magnetic order is suppressed, a dramatic increase of kappa_ab at all temperatures investigated. The analysis of our data shows that the phonons are not only strongly scattered by a magnetic mode at relatively large energy which scales roughly linearly with the magnetic field, but also by a small-energy mode which emerges near Bc with a square-root-like field dependence. While the former is in striking agreement with recent spin wave theory (SWT) results of the magnetic excitation spectrum at the Gamma point, the energy of the latter is too small to be compatible with the SWT-expected magnon gap at the M point, despite the matching field dependence. Therefore, an alternative scenario based on phonon scattering off the thermal excitation of random-singlet states is proposed.
