在父和超导 Nd_{1-x}Sr_{x}NiO_{2} 中对旋转和电荷激发的限制效应
S Fan1, H LaBollita2, Q Gao3
1National Synchrotron Light Source II, <a href="https://ror.org/02ex6cf31">Brookhaven National Laboratory</a>, Upton, New York 11973, USA.
Physical review letters
|December 3, 2024
概括
磁性是无限层尼基酸盐, Nd_{1-x}Sr_{x}NiO_{2} 固有的,即使在薄膜中. 一个SrTiO_{3}封闭层对它们的内在旋转激发和特性的影响最小.
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
- 量子材料是一种量子材料.
背景情况:
- 无限层尼基酸盐 (Nd_{1-x}Sr_{x}NiO_{2}) 的超导性目前仅限于薄膜.
- 基板和接口对尼基酸盐特性的影响尚不清楚.
- 由于合成的挑战,了解内在性质至关重要.
研究的目的:
- 为了研究无限层尼基酸盐的内在性质.
- 为了确定一个酸 (SrTiO_{3}) 封闭层对Nd_{1-x}Sr_{x}NiO_{2}激发的影响.
- 为了确认磁力在这些材料相位图中的作用.
主要方法:
- 使用了共振无弹性X射线散射 (RIXS).
- 研究了母体 (x=0) 和被兴奋剂 (x=0.2) Nd_{1-x}Sr_{x}NiO_{2}中的激发.
- 具有和没有SrTiO_{3}封闭层的样本进行了比较.
主要成果:
- 在母体和杂的Nd_{1-x}Sr_{x}NiO_{2}中观察到自旋激发,不论是封顶,证实了内在磁性.
- 旋转刺激在封闭样本中显示轻微硬化.
- 一个较弱的Ni-Nd电荷转移峰值表明,封闭样本中的杂交减少.
结论:
- 磁性是无限层酸盐在其相位图的很大一部分的内在性质.
- 一个SrTiO_{3}封闭层只会对Nd_{1-x}Sr_{x}NiO_{2}的内在性质产生极小的变化.
- 观察到的差异归因于接口重建或晶体障碍.
更多相关视频
09:06Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
Published on: March 24, 2019
8.0K
04:51Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
Published on: July 8, 2021
2.7K
相关概念视频
01:03Atomic Nuclei: Nuclear Spin State Overview
866
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
866
01:08NMR Spectroscopy: Spin–Spin Coupling
1.2K
The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
1.2K
01:23Atomic Nuclei: Nuclear Relaxation Processes
622
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis, the precessing magnetic moments are randomly oriented around the z-axis.
622
01:08Atomic Nuclei: Nuclear Spin
1.7K
All atomic particles possess an intrinsic angular momentum, or 'spin'. Electrons, protons, and neutrons each have a spin value of ½, although protons and neutrons in nuclei may have higher half-integer spins owing to energetic factors.
Atomic nuclei have a net nuclear spin, , which can have an integer or half-integer value. In atomic nuclei, the spins of protons are paired against each other but not with neutrons, and vice versa. Consequently, an even number of protons does not...
Atomic nuclei have a net nuclear spin, , which can have an integer or half-integer value. In atomic nuclei, the spins of protons are paired against each other but not with neutrons, and vice versa. Consequently, an even number of protons does not...
1.7K
01:14Atomic Nuclei: Nuclear Spin State Population Distribution
940
Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
940
01:28Types Of Superconductors
936
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...
936