在三角形Cr1.27Te2Te2中表现出准2D-Ising类型的磁性关键行为
Anirban Goswami1, Nicholas Ng2,3, Emmanuel Yakubu1
1Department of Physics and Astronomy, Howard University, Washington, District of Columbia 20059, USA.
The Journal of chemical physics
|June 3, 2024
概括
单晶Cr1.27Te2表现出二次磁性相位过渡. 关键指数表明它表现为一个准二维的Ising磁系统,提供对磁性材料的见解.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 磁力学 磁力学 是一种
背景情况:
- 了解磁相过渡对于开发新型磁性材料至关重要.
- 化化合物由于其独特的磁性特性而引起人们的兴趣.
研究的目的:
- 为了合成和表征单晶Cr1.27Te2.2.
- 为了研究磁性属性和围绕着偏磁转化为铁磁相位过渡的关键行为.
- 为了确定关键指数并对磁系统进行分类.
主要方法:
- 化学蒸汽运输用于单晶合成.
- 单晶X射线衍射用于结构分析.
- 测量磁性属性和分析关键现象 (阿罗特图,库维尔-菲舍尔方法,关键等温分析).
主要成果:
- 单晶Cr1.27Te2与三角形晶体结构 (P3̄m1空间组) 合成.
- 在TC=168.48±0.031K时,确定了二级的偏磁到铁磁相变.
- 估计了关键指数:β = 0.2631 ± 0.002, γ = 1.2314 ± 0.007,以及 δ = 5.31 ± 0.004. 这些指数是:
- 缩放分析证实了估计的临界指数的准确性.
结论:
- Cr1.27Te2 呈现出一个准2D Ising 磁系统的特征.
- 确定的临界指数与此类系统的理论预测一致.
- 这项研究为了解低维材料中的磁相过渡提供了有价值的数据.
更多相关视频
相关概念视频
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
42.3K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
42.3K
01:28Types Of Superconductors
972
A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
972
02:27Predicting Molecular Geometry
34.3K
VSEPR Theory for Determination of Electron Pair Geometries
34.3K
03:02Colors and Magnetism
11.6K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
11.6K
02:58Crystal Field Theory - Octahedral Complexes
26.3K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
26.3K
01:28Magnetostatic Boundary Conditions
909
An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
909