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Super-Necking Crystal Growth and Structural and Magnetic Properties of SrTb2O4 Single Crystals.
ACS Omega ( IF 3.7 ) Pub Date : 2020-06-29 , DOI: 10.1021/acsomega.0c01360
Si Wu 1 , Yinghao Zhu 1 , Haoshi Gao 1, 2 , Yinguo Xiao 3 , Junchao Xia 1 , Pengfei Zhou 1 , Defang Ouyang 2 , Zhen Li 4, 5 , Zhenqiang Chen 4, 5 , Zikang Tang 1 , Hai-Feng Li 1
Affiliation  

We report on single-crystal growths of the SrTb2O4 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 Tb4O7 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 θCW = 5.00(4) K, and the effective PM moment Mmeaeff = 10.97(1) μB per Tb3+ 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 SrTb2O4 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 ∼41.5 T, displaying an intricate phase diagram with three ranges.

中文翻译:

SrTb2O4单晶的超颈晶体生长及其结构和磁性。

我们通过超颈缩技术和激光浮区炉报告了SrTb 2 O 4化合物的单晶生长,并通过扫描电子显微镜,中子Laue,X研究了化学计量,生长模式以及结构和磁性能射线粉末衍射和物理性能测量系统。我们优化了生长参数,主要是生长速度,气氛和添加Tb 4 O 7原材料。中子劳厄衍射显示出单晶的特征。我们的研究揭示了Sr:Tb = 0.97(2):2.00(1)的原子比以及可能的逐层晶体生长模式。我们的X射线粉末衍射研究确定了晶体结构,晶格常数和原子位置。顺磁性(PM)居里-外斯(CW)温度θ CW = 5.00(4)K,并且有效PM瞬间中号MEA EFF = 10.97(1)μ每TB 3+离子。磁化强度与温度的数据可分为三个状态,显示出反铁磁和铁磁相互作用的共存。这可能导致SrTb 2 O 4中的磁性受阻复合。2 K和14 T处的磁化强度既来自Tb1位置,又来自Tb2位置,并且在41.5 T处的预期饱和磁场下强烈受挫,显示出三个范围的复杂相图。
更新日期:2020-07-14
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