TmAl $_3$（BO $_3$）$_4$中稀土磁矩引起的磁电和磁致伸缩
Magnetoelectricity and Magnetostriction due to the Rare Earth Moment in TmAl$_3$(BO$_3$)$_4$
摘要：
研究了无d电子稀土硼酸铝TmAl $_3$（BO $_3$）$_4$在室温至2 K温度范围内的磁性、磁致伸缩和磁电效应.磁化率显示出强的各向异性与六角形的c轴作为硬磁轴。磁致伸缩测量结果表明，一个面内场减少，a-和c-轴晶格参数的大的影响。在70 kOe的磁场沿a轴方向施加的情况下，a和c方向上的磁电极化变化高达300 $μ$ C/m $^2$。磁电极化与磁场中晶格的收缩成正比。研究结果表明，在$R$ Al $_3$（BO $_3$）$_4$（$R$ =稀土）化合物中，稀土磁矩与晶格之间存在着明显的耦合。他们进一步表明，稀土矩本身会产生很大的磁电效应，这使得研究和理解这类材料中磁电相互作用的起源变得更容易。
英文摘要：
The magnetic properties, the magnetostriction, and the magnetoelectric effect in the d-electron free rare-earth aluminum borate TmAl$_3$(BO$_3$)$_4$ are investigated between room temperature and 2 K. The magnetic susceptibility reveals a strong anisotropy with the hexagonal c-axis as the hard magnetic axis. Magnetostriction measurements show a large effect of an in-plane field reducing both, the a- and c-axis lattice parameters. The magnetoelectric polarization change in a- and c-directions reaches up to 300 $μ$C/m$^2$ at 70 kOe with the field applied along the a-axis. The magnetoelectric polarization is proportional to the lattice contraction in magnetic field. The results of this investigation prove the existence of a significant coupling between the rare earth magnetic moment and the lattice in $R$Al$_3$(BO$_3$)$_4$ compounds ($R$ = rare earth). They further show that the rare earth moment itself will generate a large magnetoelectric effect which makes it easier to study and to understand the origin of the magnetoelectric interaction in this class of materials.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
