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Triplet waves in a quantum spin liquid

Xu1, Broholm, Reich

  • 1Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218, USA.

Physical Review Letters
|September 16, 2000
PubMed
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We studied the spin-1/2 alternating bond antiferromagnet Cu(NO3)2;2.5D2O using neutron scattering. At low temperatures, a coherent singlet-triplet mode dominates, showing band narrowing and damping at higher temperatures.

Area of Science:

  • Condensed Matter Physics
  • Quantum Magnetism
  • Materials Science

Background:

  • Spin-1/2 alternating bond antiferromagnets are crucial for understanding quantum magnetism.
  • Neutron scattering is a powerful technique for probing magnetic excitations in materials.

Purpose of the Study:

  • To investigate the low-energy excitation spectrum of Cu(NO3)2;2.5D2O.
  • To characterize the temperature dependence of magnetic excitations.
  • To provide a comprehensive description of the scattering function.

Main Methods:

  • Neutron scattering experiments were performed on Cu(NO3)2;2.5D2O.
  • The temperature range studied was 0.06 < kBT/J1 < 1.5.
  • The single mode approximation was used to describe the zero-temperature scattering function.

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Main Results:

  • A coherent singlet-triplet mode with sinusoidal dispersion was observed, centered at J1 = 0.442(2) meV and with a bandwidth of J2 = 0.106(2) meV.
  • At finite temperatures, exponential band narrowing and damping of the excitation mode were observed.
  • The relaxation rate was found to be thermally activated and wave vector dependent.

Conclusions:

  • The study provides a detailed characterization of the magnetic excitations in a spin-1/2 alternating bond antiferromagnet.
  • The observed phenomena offer insights into the interplay between temperature and quantum fluctuations in magnetic systems.
  • The findings contribute to the fundamental understanding of exotic magnetic phases and their dynamics.