Related Experiment Video
Updated: Jan 31, 2026
05:39
Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
Published on: August 2, 2019
10.4K
Quantum Spin Liquid Intertwining Nematic and Superconducting Order in Fese
Jian-Huang She1, Michael J Lawler1,2,3, Eun-Ah Kim1,3
1Department of Physics, Cornell University, Ithaca, New York 14853, USA.
Physical Review Letters
|December 22, 2018
Summary
We propose a nematic quantum spin liquid model to explain FeSe superconductivity, reproducing key neutron spectra features. This model reveals a nodeless s±d wave pairing mechanism driven by spin fluctuations, explaining observed gap anisotropy.
Area of Science:
- Condensed matter physics
- Quantum magnetism
Background:
- The pairing mechanism in iron selenide (FeSe) is not fully understood.
- FeSe exhibits unique properties like nematic order without magnetic order and a nodeless superconducting gap.
Purpose of the Study:
- To propose a microscopic model for FeSe superconductivity.
- To explain the observed phenomena including neutron spectra and gap anisotropy.
Main Methods:
- Developing a microscopic description of a nematic quantum spin liquid.
- Utilizing a spin-fermion model to study pairing mechanisms.
- Investigating orbital-dependent Kondo-like coupling.
Main Results:
- The proposed model reproduces key features of inelastic neutron scattering spectra.
- A nodeless s±d wave superconducting order parameter is identified within each domain.
- Orbital-dependent Kondo-like coupling explains the observed gap anisotropy.
Conclusions:
- The study provides a microscopic explanation for FeSe superconductivity.
- Spin fluctuations are identified as the driving force for pairing.
- Further experiments, such as inelastic neutron scattering on detwinned samples, are recommended.
Related Concept Videos
02:43Quantum Numbers
50.0K
It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
50.0K
02:45The Quantum-Mechanical Model of an Atom
57.3K
Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
57.3K
01:08NMR Spectroscopy: Spin–Spin Coupling
3.2K
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...
3.2K
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