Anisotropy-governed competition of magnetic phases in the honeycomb quantum magnet Na 3 Ni 2 SbO 6 studied by dilatometry and high-frequency ESR
Anisotropy-governed competition of magnetic phases in the honeycomb quantum magnet Na 3 Ni 2 SbO 6 studied by dilatometry and high-frequency ESR
复制标题
通过膨胀法和高频ESR研究蜂窝状量子磁体Na 3 Ni 2 SbO 6 中各向异性控制的磁相竞争
DOI：
10.1103/physrevb.95.214414
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发表时间：
2017
影响因子：
3.7
通讯作者：
R. Klingeler
中科院分区：
文献类型：
--
作者：
J. Werner;W. Hergett;M. Gertig;J. Park;C. Koo;R. Klingeler
蜂窝层的热力学性质和低能磁振子激发已经通过高分辨率膨胀测量、静态磁化和高频电子自旋共振研究在高达16 t的磁场中进行了研究。在= 16.5 K处，有一个三临界点将两个不同的反铁磁相AF1和AF2从顺磁区分开。此外，我们的数据暗示了短程反铁磁相关至少到。在下方，需要磁场dt来稳定AF2和AF1。热膨胀和磁致伸缩异常具有显著的磁弹性耦合，两者都与的符号变化有关。在电子-自旋共振谱中观察到这种跃迁与反铁磁共振模式的软化有关。gapGHz的各向异性意味着相当大的单轴各向异性。我们推断轴向各向异性对AF1自旋结构比AF2自旋结构有利的关键作用。虽然磁致伸缩数据反驳了一个简单的自旋翻转场景，但13t的第二次转变的性质仍然不清楚。磁致伸缩符号和gralneisen分析表明，高温下的短程相关为AF2型。
Thermodynamic properties and low-energy magnon excitations ofhoneycomb-layeredhave been investigated by high-resolution dilatometry, static magnetization, and high-frequency electron spin resonance studies in magnetic fields up to 16 T. At= 16.5 K, there is a tricritical point separating two distinct antiferromagnetic phases, AF1 and AF2, from the paramagnetic regime. In addition, our data imply short-range antiferromagnetic correlations at least up to. Well below, the magnetic fieldT is needed to stabilize AF2 against AF1. The thermal expansion and magnetostriction anomalies atandimply significant magnetoelastic coupling, both of which are associated with a sign change of. The transition atis associated with softening of the antiferromagnetic resonance modes observed in the electron-spin-resonance spectra. The anisotropy gapGHz implies considerable uniaxial anisotropy. We deduce the crucial role of axial anisotropy favoring the AF1 spin structure over the AF2 one. While the magnetostriction data disprove a simple spin-flop scenario at, the nature of a second transition at13 T remains unclear. Both the sign of the magnetostriction and Grüneisen analysis suggest that the short-range correlations at high temperatures are of AF2 type.
DOI：
--
发表时间：
2011
期刊：
--
影响因子：
--
作者：
M. Rosseinsky
通讯作者：
M. Rosseinsky