在Megabar压力下,超化物YH6中的旋相动力学
Andrey V Sadakov1, Vladimir A Vlasenko1, Ivan A Troyan2
1P. N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow 119991, Russia.
The journal of physical chemistry letters
|July 18, 2023
概括
这项研究研究了高温超导体YH6中的旋相,揭示了高流量流动障碍和独特的旋相图. 这些发现将YH6定位为先进超导应用的有前途材料.
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
- 超导电性 超导电性 超导电性
背景情况:
- 高温超导体,特别是化物,对于推进超导技术至关重要.
- 了解动力学和相位转换是优化在极端条件下超导体性能的关键.
研究的目的:
- 为了全面研究YH6在215K和200GPa的旋阶段和动态.
- 为了确定热激活能量,并分析旋相位过渡.
- 为超化物构建第一个旋相位图.
主要方法:
- 热激活流量流 (TAFF) 理论的应用,以导出热激活能量 (U0).
- 分析U0的磁场依赖性,包括功率定律和交叉场.
- 使用旋转玻璃理论来描述从旋转玻璃到旋转液态的过渡.
主要成果:
- 在200GPa时,YH6的高临界温度 (T<0xE1><0xB5><0xA_>) 开始为215K.
- 导出的热激活能量U0遵循功率定律U0 H^α,交叉约为8-10 T.
- 构建了螺旋相图,显示高流量流障碍 (1.5-7 × 104 K) 和高交叉场.
- 金兹堡数 (3-7 × 10−3) 表示热波动对超导过渡的有限扩展.
结论:
- 由于高流量流动障碍和交叉场,YH6与铜酸盐和铁基系统相比是一个优秀的超导体.
- 该材料表现出强大的超导性能,热波动效应有限.
- 建立的旋转相图为未来的超化物研究和应用提供了关键的见解.
相关概念视频
02:33Phase Transitions: Sublimation and Deposition
17.2K
Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
17.2K
02:39Phase Transitions: Vaporization and Condensation
17.7K
The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase...
17.7K
02:39Phase Diagrams
41.7K
A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
41.7K
01:19Phase Diagram
5.9K
The phase of a given substance depends on the pressure and temperature. Thus, plots of pressure versus temperature showing the phase in each region provide considerable insights into the thermal properties of substances. Such plots are known as phase diagrams. For instance, in the phase diagram for water (Figure 1), the solid curve boundaries between the phases indicate phase transitions (i.e., temperatures and pressures at which the phases coexist).
5.9K
02:31Phase Transitions
19.2K
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
19.2K
01:28Vapor Pressure of Fluid
1.4K
The vapor pressure of a fluid is a crucial concept in fluid mechanics, influencing phenomena such as boiling and cavitation. Vapor pressure refers to the pressure exerted by a vapor at a state of thermodynamic equilibrium with its corresponding liquid phase at a specific temperature. It represents the tendency of molecules to escape from the fluid surface into the vapor phase.
When a liquid is placed in a closed container with a small air space, and the space is evacuated, vapor molecules will...
When a liquid is placed in a closed container with a small air space, and the space is evacuated, vapor molecules will...
1.4K