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Related Concept Videos

Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
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Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
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Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

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Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
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The Pauli Exclusion Principle03:06

The Pauli Exclusion Principle

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The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:
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Valence Bond Theory02:42

Valence Bond Theory

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Related Experiment Video

Updated: Apr 4, 2026

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Quantum Spin Liquid Emerging from Antiferromagnetic Order by Introducing Disorder.

T Furukawa1, K Miyagawa1, T Itou2

  • 1Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan.

Physical Review Letters
|August 29, 2015
PubMed
Summary

Disordered organic Mott insulators can become quantum spin liquids, a novel state of quantum matter. NMR experiments reveal that disorder drives a classical magnet into this exotic state, showing gapless spin excitations.

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Phase Diagram Characterization Using Magnetic Beads as Liquid Carriers
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Area of Science:

  • Condensed matter physics
  • Quantum magnetism

Background:

  • Quantum spin liquids are exotic states of matter analogous to quantum liquids, exhibiting long-range quantum entanglement.
  • Geometrical frustration in magnetic systems has been a primary focus for realizing quantum spin liquids.
  • Disorder's role in driving classical magnets towards quantum spin liquid states remains an active area of research.

Purpose of the Study:

  • To investigate the impact of disorder on magnetic ordering in an organic Mott insulator.
  • To determine if disorder can induce a quantum spin liquid state from a classical ordered phase.
  • To explore the nature of spin excitations in a disordered magnetic system.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) experiments were conducted on κ-(ET)2Cu[N(CN)2]Cl crystals.
  • Crystals were subjected to x-ray irradiation to introduce controlled disorder.
  • NMR data was analyzed to probe magnetic ordering, spin dynamics, and the presence of spin excitations.

Main Results:

  • Antiferromagnetic ordering in the pristine crystal vanished after x-ray irradiation.
  • Evidence for spin freezing, spin gap, and critical slowing down was absent.
  • Gapless spin excitations were observed, indicating a transition to a novel disordered state.

Conclusions:

  • Disorder plays a crucial role in transforming a classical magnet into a quantum spin liquid.
  • The observed gapless spin excitations suggest a unique pathway to quantum spin liquid formation.
  • This study highlights a novel mechanism for achieving quantum spin liquid states in frustrated magnetic systems.