Magneto-structural coupling in ilmenite-type NiTiO$_3$: a combined diffraction and dilatometry study

蜂窝晶格磁体NiTiO3中的狄拉克磁振子

Dirac Magnon in Honeycomb Lattice Magnet NiTiO3

本研究通过非弹性中子散射实验，在蜂窝晶格磁体NiTiO3中观测到能量为3.7 meV的自旋波，并利用线性自旋波理论建模，证实了狄拉克磁振子的存在及狄拉克节线的形成。

Magnetic phase diagram and magneto-elastic coupling of NiTiO3

We report high-resolution dilatometry on high-quality single crystals of NiTiO3 grown by means of the optical floating-zone technique. The anisotropic magnetic phase diagram is constructed from thermal expansion and magnetostriction studies up to B=15T and magnetization studies in static (15T) and pulsed (60T) magnetic fields. Our data allow to quantitatively study magneto-elastic coupling and to determine uniaxial pressure dependencies. While the entropy changes are found to be of magnetic nature, Grüneisen analysis implies only one relevant energy scale in the whole low-temperature regime. T…

利用中子散射研究 NiTiO3 蜂窝状反铁磁体中的磁动力学

Magnetic dynamics in NiTiO3 honeycomb antiferromagnet using neutron scattering

该研究通过中子能谱测量 NiTiO3 蜂窝反铁磁体的温度依赖磁结构与动力学，并用高度各向异性 Heisenberg 模型解释声子/光学磁激发、临界指数及弱阻挫特征。

Magnetic phase diagram, magnetoelastic coupling and Grüneisen scaling in CoTiO$_3$

High-quality single crystals of CoTiO$_3$ are grown and used to elucidate in detail structural and magnetostructural effects by means of high-resolution capacitance dilatometry studies in fields up to 15 T which are complemented by specific heat and magnetization measurements. In addition, we refine the single-crystal structure of the ilmenite ($R\bar{3}$) phase. At the antiferromagnetic ordering temperature $T_\mathrm{N}$, pronounced $λ$-shaped anomaly in the thermal expansion coefficients signals shrinking of both the $c$ and $b$ axes, indicating strong magnetoelastic coupling with uniaxial …