Related Experiment Video
Updated: Feb 10, 2026
04:51
Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
Published on: July 8, 2021
3.2K
Quantal phases, disorder effects, and superconductivity in spin-Peierls systems
1Computational Materials Science Center, National Institute for Materials Science, Tsukuba 305-0047, Japan.
Physical Review Letters
|March 23, 2002
Summary
Dilute impurity doping in quasi-one-dimensional systems can induce antiferromagnetic order or superconductivity. This study reveals a shared origin for these phenomena, linking static vacancies to antiferromagnetism and mobile holes to superconductivity.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Chemistry
Background:
- Recent investigations into cuprate high-temperature superconductors and the spin-Peierls compound CuGeO3.
- The established understanding of spin-Peierls transitions in quasi-one-dimensional systems.
Purpose of the Study:
- To investigate the impact of dilute impurity doping on the spin-Peierls state in quasi-one-dimensional systems.
- To identify a common underlying mechanism for emergent antiferromagnetic order and superconductivity induced by doping.
Main Methods:
- Theoretical modeling of quasi-one-dimensional systems with dilute impurity doping.
- Analysis of the effects of static vacancies and mobile holes on magnetic and electronic properties.
Main Results:
- Dilute impurity doping can stabilize antiferromagnetic order through static vacancies.
- Mobile holes introduced by doping can lead to superconductivity.
- A common origin is identified for both emergent antiferromagnetism and superconductivity.
Conclusions:
- Static vacancies and mobile holes, introduced via doping, represent two distinct pathways to modify the spin-Peierls state.
- Understanding these doping effects is crucial for designing novel superconducting and magnetic materials.
Related Concept Videos
01:19Phase I Reactions: Oxidation of Aliphatic and Aromatic Carbon-Containing Systems
736
Phase I biotransformation reactions are integral to drug metabolism, predominantly involving oxidative, reductive, and hydrolytic transformations. Chief among these are oxidative reactions, which enhance the hydrophilicity of xenobiotics and introduce polar functional groups to facilitate their elimination from the body.
Oxidation reactions are fundamental in aromatic carbon-containing systems. An example is the hydroxylation of phenobarbital, a process that transforms it into...
Oxidation reactions are fundamental in aromatic carbon-containing systems. An example is the hydroxylation of phenobarbital, a process that transforms it into...
736
01:15Phase I Reactions: Oxidation of Carbon-Heteroatom and Miscellaneous Systems
425
Oxidative reactions are pivotal in metabolizing numerous compounds, including pharmaceutical drugs. These reactions often occur in carbon-heteroatom systems, such as carbon-nitrogen, carbon-sulfur, and carbon-oxygen.
In carbon-nitrogen systems, aliphatic and aromatic amines can undergo oxidative reactions. Secondary and tertiary amines, like those found in tricyclic antidepressants, can undergo N-dealkylation, a process that involves the oxidation of the alkyl group. In addition, oxidative...
In carbon-nitrogen systems, aliphatic and aromatic amines can undergo oxidative reactions. Secondary and tertiary amines, like those found in tricyclic antidepressants, can undergo N-dealkylation, a process that involves the oxidation of the alkyl group. In addition, oxidative...
425
01:08NMR Spectroscopy: Spin–Spin Coupling
3.3K
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...
3.3K
01:17Spin–Spin Coupling: One-Bond Coupling
1.5K
Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
1.5K
01:08Spin–Spin Coupling Constant: Overview
1.5K
In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
1.5K
01:20Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)
1.7K
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
1.7K