適度な圧力下における四次方 La-Y-Ce ハイドリッドにおける優れた超伝導特性
Su Chen1, Yulong Wang1, Fuquan Bai2
1State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China.
Journal of the American Chemical Society
|May 8, 2024
まとめ
研究者らは,高温超伝導体におけるこの画期的な発見により,重要な磁場と電流密度が強化され,将来の応用への道が開けています.
科学分野:
- 材料科学
- 凝縮物質物理学
- 超伝導性
背景:
- ハイドリッド超伝導体は 高温超伝導の革命の中心です
- マルチコンポーネント水素は,新しい超伝導物質の発見のための重要なプラットフォームです.
- 超伝導性の高い移行温度 (Tc),臨界磁場 (μ0Hc2) および臨界電流密度 (Jc) を達成することは,実用的なアプリケーションにとって極めて重要です.
研究 の 目的:
- 超伝導性の高い新型四次 La-Y-Ce 水素を合成する.
- 水素超伝導体の安定性と性能に対する"エントロピー工学"の影響を調査する.
- 高温超伝導性を達成するための多成分水素の潜在能力を探求する.
主な方法:
- 適度な圧力下での"エントロピー工学"を用いた四次性La-Y-Ce水素の合成.
- 超伝導性を確認するために抵抗の温度依存の測定.
- トランジション温度 (Tc),上部臨界磁場 (μ0Hc2) および臨界電流密度 (Jc) を含む超伝導特性.
主要な成果:
- 112 GPaでTc ~ 190 Kまでの超伝導性を有するFm3m- ((La,Y,Ce) H10の合成が成功しました.
- 特殊な超伝導性能が観察された: μ0Hc2 ((0) は292TとJc ((0) > 4.61 × 10^7 A/cm^2に達する.
- (La,Y,Ce) H10のFm3m構造は,バイナリ水素と比較して比較的低い圧力での安定性を示しています.
結論:
- 多成分水素は"エントロピー工学"により,超伝導性を大幅に高め,低圧で超伝導相を安定させる.
- この研究は,マルチヒドリド超伝導体に関するさらなる実験的研究を奨励する.
- この発見は,様々なヒドリド材料における室温の超伝導体に関する現在進行中の研究にとって貴重な参考資料となる.
さらに関連する動画
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
04:51Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
Published on: July 8, 2021
2.8K
関連する概念動画
01:24Superconductor
1.1K
A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
1.1K
02:54Trends in Lattice Energy: Ion Size and Charge
23.9K
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:
23.9K
01:25Yield Criteria for Ductile Materials under Plane Stress
160
In designing structural elements and machine parts using ductile materials, it is crucial to ensure that these components withstand applied stresses without yielding. Yielding is initially determined through a tensile test, which evaluates the material's response to uniaxial stress. However, tensile stress is insufficient when components face biaxial or plane stress conditions This condition requires advanced criteria to predict failure.
The Maximum Shearing Stress Criterion, also known as...
The Maximum Shearing Stress Criterion, also known as...
160
02:39Phase Diagrams
40.6K
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...
40.6K