在局部非中心对称超导体CeRh_{2}As_{2}中压力调整的量子临界性
M Pfeiffer1,2, K Semeniuk2, J F Landaeta1,2
1Institute for Solid State and Materials Physics, <a href="https://ror.org/042aqky30">TU Dresden University of Technology</a>, 01062 Dresden, Germany.
Physical review letters
|October 7, 2024
概括
这项研究揭示了压力抑制了非传统超导体CeRh2As2中的神秘T0顺序,揭示了量子临界点. 这种量子关键性与该材料独特的双相超导性有关.
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:
- CeRh2As2是一种非常规的超导体 (Tc ≈ 0.4 K),在两个超导相之间表现出罕见的磁场诱导过渡,可能是由于其非中心对称结构.
- 在T0=0.5K时发生的前一个未知起源的相过渡和在量子临界点 (QCP) 附近的非费米液态行为表明量子波动的影响.
- 量子波动,正常状态顺序和CeRh2As2中的超导性与分级Rashba相互作用之间的相互作用仍然是一个开放的问题.
研究的目的:
- 调查量子波动和正常状态顺序在CeRh2As2.2的两相超导性中的作用.
- 探索水静压对T0相位过渡的影响及其与量子临界点 (QCP) 的联系.
- 了解非传统超导的背后机制和两个不同的超导相的起源.
主要方法:
- 在水静压下测量电阻和比热.
- 分析相位转换和电子性质的温度和压力依赖.
- 研究电阻行为从线性 (非费尔米液体) 演变为二次性 (费尔米液体) 随着压力增加的演变.
主要成果:
- 在临界压力 (P0 ≈ 0.5 GPa) 时,T0 顺序完全消失,揭示了一个QCP.
- 电阻随着压力增加而从P0的线性温度依赖变化为二次的费米-液体依赖,抑制量子关键波动.
- 超导临界温度 (Tc) 在 P0 周围的圆顶状行为表明,T0 顺序的波动有助于超导配对机制.
结论:
- 通过抑制神秘的T0顺序,水静压驱动CeRh2As2向一个QCP.
- 与T0顺序相关的量子关键性在CeRh2As2.2的非传统的两相超导性中起着至关重要的作用.
- 这些发现提供了对相关电子系统中秩序,量子波动和超导性之间的复杂相互作用的见解.
更多相关视频
08:42High-Sensitivity Nuclear Magnetic Resonance at Giga-Pascal Pressures: A New Tool for Probing Electronic and Chemical Properties of Condensed Matter under Extreme Conditions
Published on: October 10, 2014
11.6K
07:26Synthesis and Microdiffraction at Extreme Pressures and Temperatures
Published on: October 7, 2013
11.2K
相关概念视频
01:192D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)
657
Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
657
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
41.7K
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,...
41.7K
03:26Electron Configuration of Multielectron Atoms
39.5K
The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the 3s orbital, giving a 1s22s22p63s1 configuration. The electrons occupying the outermost shell orbital(s) (highest value of n) are called valence electrons, and those occupying the inner shell orbitals are called core electrons. Since the core electron shells correspond to noble gas electron configurations, we can abbreviate electron...
39.5K
02:37Metallic Solids
18.3K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
18.3K
01:19Phase Diagram
5.8K
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).
5.8K
02:58Crystal Field Theory - Octahedral Complexes
26.2K
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...
26.2K