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Related Concept Videos

Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

12.2K
The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
12.2K
Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

26.8K
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:
26.8K
Bewley Lattice Diagram01:12

Bewley Lattice Diagram

1.5K
The Bewley lattice diagram, developed by L. V. Bewley, effectively organizes the reflections occurring during transmission-line transients. It visually represents how voltage waves propagate and reflect within a transmission line, making it easier to understand the complex interactions that occur.
1.5K
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR 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
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–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
Spin–Spin Coupling Constant: Overview01:08

Spin–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...
1.5K

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Related Experiment Video

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Measuring the Spin-Lattice Relaxation Magnetic Field Dependence of Hyperpolarized [1-13C]pyruvate
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Spin-lattice decoupling in a triangular-lattice quantum spin liquid.

Takayuki Isono1,2, Shiori Sugiura3, Taichi Terashima3

  • 1National Institute for Materials Science, Tsukuba, Ibaraki, 305-0003, Japan. takayuki.isono@riken.jp.

Nature Communications
|April 19, 2018
PubMed
Summary
This summary is machine-generated.

Quantum spin liquids (QSLs) exhibit exotic spin behavior. This study reveals decoupled spins in a QSL state, supporting gapless spin excitations and weak spin-lattice coupling near quantum critical points.

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Area of Science:

  • Condensed matter physics
  • Quantum magnetism

Background:

  • Quantum spin liquids (QSLs) are exotic states of matter with strongly correlated electron spins.
  • Conventional magnetic orders are suppressed by quantum fluctuations, leading to unique spin excitation properties.
  • The nature of fractionalized spin excitations (spinons) in QSLs remains a subject of debate.

Purpose of the Study:

  • To investigate the spin-lattice coupling in an organic spin-1/2 triangular-lattice antiferromagnet.
  • To explore the characteristics of spinons and their behavior in a QSL state.
  • To compare experimental findings with theoretical models of strongly correlated QSLs near quantum critical points.

Main Methods:

  • Magnetocaloric-effect measurements were performed on an organic spin-1/2 triangular-lattice antiferromagnet.
  • The study focused on analyzing the behavior of electron spins and their interaction with lattice vibrations.
  • Magnetic fields were applied away from a quantum critical point to probe spin-lattice coupling.

Main Results:

  • Evidence of electron spins being decoupled from the lattice in the QSL state was observed.
  • The decoupling phenomena suggest a gapless nature for the spin excitations.
  • A significant reduction in spin states interacting with lattice vibrations was found, indicating weak spin-lattice coupling.

Conclusions:

  • The experimental results support the gapless nature of spin excitations in the studied QSL.
  • The findings highlight weak spin-lattice coupling in proximity to a quantum critical point.
  • The study provides valuable insights into the complex behavior of strongly correlated quantum spin liquids.