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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,...
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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.
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Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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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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Spin-State Ice in Elastically Frustrated Spin-Crossover Materials.

Jace Cruddas1, B J Powell1

  • 1School of Mathematics and Physics , The University of Queensland , Brisbane , QLD 4072 , Australia.

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|November 13, 2019
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Researchers predict a new "spin-state ice" phase in frustrated materials. This phase lacks long-range order, following a local ice rule, and exhibits mobile excitations without electrical charge.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Chemistry

Background:

  • Bistable spin-state molecules are crucial for molecular switches and exhibit collective phenomena like hysteresis in crystals.
  • Elastic frustration significantly impacts spin crossover materials, influencing their complex behaviors.

Purpose of the Study:

  • To predict a novel phase of matter for bistable molecules on a frustrated kagome lattice using an elastic model.
  • To characterize the properties and excitations of this predicted phase, termed "spin-state ice".

Main Methods:

  • Development and application of an elastic model for bistable molecules on a kagome lattice.
  • Analysis of the predicted "spin-state ice" phase, focusing on its local order and collective excitations.

Main Results:

  • Prediction of a new phase, "spin-state ice," characterized by a local "ice rule" without long-range spin-state order.
  • Identification of mobile collective excitations carrying fractional spin but no charge.
  • Distinctive experimental signatures predicted for neutron scattering, electron paramagnetic resonance, and thermodynamics.

Conclusions:

  • The kagome lattice's intrinsic frustration can lead to novel spin-state ordering, exemplified by "spin-state ice."
  • This phase exhibits unique excitations with potential implications for molecular electronics.
  • Experimental verification of "spin-state ice" is supported by predicted spectroscopic and thermodynamic signatures.