隠された局所的な対称性破裂は,カゴメ・ラティス磁気ウェイル半金属で
PubMedで要約を見る
まとめ
この要約は機械生成です。局所的な対称性破裂は,カゴメ・グリッドのウェイル半金属Co3Sn2S2でフェロマグネティック・オーダーとともに発生し,グリッドの乱れを明らかにし,磁気およびトポロジック特性を影響する.
科学分野
- 凝縮物質物理学
- 材料科学
- 量子材料について
背景
- Co3Sn2S2は,トポロジカルと磁性特性を併用したカゴーム格子磁性ウェイル半金属である.
- 未解決のパズルには,キュリー温度 (TC) 以下の磁気相分離とスピンガラス状態が含まれています.
研究 の 目的
- Co3Sn2S2の磁気特性と構造的複雑性の起源を調査する.
- 局所的な対称性の破裂と 鉄磁気秩序の発生の関係を理解する
主な方法
- ニュートロン総分散
- 半極化ニュートロン散射
- 密度関数理論 (DFT) の計算
主要な成果
- Co3Sn2S2における鉄磁気秩序と一致する局所的な対称性破裂の発見.
- 原子/ナノレベルでのコバルトカゴーム格子におけるアニゾトロプ的歪みの観測.
- 局所的な対称性破裂に関連したTCの下の内在の格子障害の特定.
結論
- 局所的な対称性破裂は Co3Sn2S2の不思議な磁性について 新たな洞察をもたらします
- 格子と鉄磁気不安定は結びつき,磁気モメントの方向転換に影響する.
- 局所的な対称性破裂は,鏡対称性を破ることでウェイル特性に影響し,トポロジカル半金属におけるその重要性を強調する.
関連する概念動画
A planar symmetry of charge density is obtained when charges are uniformly spread over a large flat surface. In planar symmetry, all points in a plane parallel to the plane of charge are identical with respect to the charges. Suppose the plane of the charge distribution is the xy-plane, and the electric field at a space point P with coordinates (x, y, z) is to be determined. Since the charge density is the same at all (x, y) - coordinates in the z = 0 plane, by symmetry, the electric field at P...
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
Conventions
Here, the convention is used where the ionic...
Once the fields have been calculated using Maxwell's four equations, the Lorentz force equation gives the force that the fields exert on a charged particle moving with a certain velocity. The Lorentz force equation combines the force of the electric field and of the magnetic field on the moving charge. Maxwell's equations and the Lorentz force law together encompass all the laws of electricity and magnetism. The symmetry that Maxwell introduced into his mathematical framework may not be...
The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
A charge distribution has cylindrical symmetry if the charge density depends only upon the distance from the axis of the cylinder and does not vary along the axis or with the direction about the axis. In other words, if a system varies if it is rotated around the axis or shifted along the axis, it does not have cylindrical symmetry. In real systems, we do not have infinite cylinders; however, if the cylindrical object is considerably longer than the radius from it that we are interested in,...

