论文标题
SRTB $ _2 $ o $ _4 $单晶的超级颈晶体生长以及结构和磁性
Super-Necking Crystal Growth and Structural and Magnetic Properties of SrTb$_2$O$_4$ Single Crystals
论文作者
论文摘要
我们报告了Srtb $ _2 $ o $ o $ o _4 $的单晶增长，该技术通过一种具有激光浮动区熔炉的超颈技术，并通过扫描电子模式，结构和磁性进行了化学计量，结构和磁性，通过扫描电子显微镜，电子粉状液体，X射线粉末散布和物理级别。我们优化了增长参数，主要是增长速度，气氛和添加TB $ _4 $ o $ $ _7 $原材料。中子laue衍射显示了单晶的特征。我们的研究揭示了SR的原子比：TB $ = 0.97（2）{：} 2.00（1）$，以及可能按层晶体生长模式进行层。我们的X射线粉末衍射研究决定了晶体结构，晶格常数和原子位置。 progaragnetic（pm）curie- weiss（cw）温度$θ_ {\ texttt {cw}} = $ 5.00（4）k，以及有效的PM力矩$ m^{\ texttt {eff}}} _ {\ texttt {mea}}} tb $^{3+} $ ion。磁化与温度的数据可以分为三个方案，显示出抗铁磁和铁磁相互作用的共存。这可能导致SRTB $ _2 $ o $ $ _4 $化合物的磁性挫败感。 2 K和14 T的磁化源于TB1和TB2位点，并且对预期的饱和场（$ \ sim $ 41.5 t）感到非常沮丧，显示了带有三个范围的复杂相图。
We report on single-crystal growths of the SrTb$_2$O$_4$ compound by a super-necking technique with a laser-floating-zone furnace and study the stoichiometry, growth mode, and structural and magnetic properties by scanning electronic microscopy, neutron Laue, X-ray powder diffraction, and the physical property measurement system. We optimized the growth parameters, mainly the growth speed, atmosphere, and the addition of a Tb$_4$O$_7$ raw material. Neutron Laue diffraction displays the characteristic feature of a single crystal. Our study reveals an atomic ratio of Sr:Tb $ = 0.97(2){:}2.00(1)$ and a possible layer by layer crystal growth mode. Our X-ray powder diffraction study determines the crystal structure, lattice constants and atomic positions. The paramagnetic (PM) Curie--Weiss (CW) temperature $θ_{\texttt{CW}} =$ 5.00(4) K, and the effective PM moment $M^{\texttt{eff}}_{\texttt{mea}} =$ 10.97(1) $μ_\texttt{B}$ per Tb$^{3+}$ ion. The data of magnetization versus temperature can be divided into three regimes, showing a coexistence of antiferromagnetic and ferromagnetic interactions. This probably leads to the magnetic frustration in the SrTb$_2$O$_4$ compound. The magnetization at 2 K and 14 T originates from both the Tb1 and Tb2 sites and is strongly frustrated with an expected saturation field at $\sim$41.5 T, displaying an intricate phase diagram with three ranges.
