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Magnetically Driven Quantum Phase Transition in a Low-Dimensional Pyrazine-Bridged Cu2+ Chain Magnet.

Avery L Blockmon1, Jinhyeong Jo2, Kiman Park1

  • 1Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States.

Inorganic Chemistry
|June 12, 2025
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Summary

Researchers investigated quantum magnetism in copper coordination polymers using advanced techniques. They revealed that both Cu2+ 3d orbitals contribute to high-field spin transitions, offering new insights into magnetic materials.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Magnetism
  • Materials Science

Background:

  • Quasi-one-dimensional Heisenberg antiferromagnets with S = 1/2 are well-studied, often utilizing copper-containing coordination polymers.
  • Understanding high-field spin state transitions is hindered by the inability to resolve orbital contributions to magnetization.

Purpose of the Study:

  • To unravel orbital-specific contributions to magnetism in a linear chain quantum magnet.
  • To investigate high field spin state transitions and structural phase transitions in [CuL2(H2O)2(pyz)](ClO4)2.

Main Methods:

  • Pulsed field magnetization
  • Optical spectroscopy
  • Magnetic circular dichroism
  • Electronic structure calculations

Main Results:

  • Observed spin flop and field-driven transition to a fully saturated spin state.
  • Untangled the green to teal color change associated with the 185 K structural phase transition.
  • Decomposed magnetic circular dichroism using Cu2+ → pyrazine charge transfer excitations.
  • Revealed that both e_g-derived Cu2+ 3d orbitals contribute to the field-driven transition.

Conclusions:

  • Both e_g-derived Cu2+ 3d orbitals are involved in high-field spin transitions, not solely those with unpaired electrons.
  • The strong dichroic signature at room temperature is attributed to uncorrelated spin.