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Quantum-classical reentrant relaxation crossover in Dy2Ti2O7 spin ice.

J Snyder1, B G Ueland, J S Slusky

  • 1Department of Physics, Pennsylvania State University, University Park, Pennsylvania 16802, USA.

Physical Review Letters
|October 4, 2003
PubMed
Summary
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Quantum tunneling governs spin relaxation in Dy2Ti2O7 below 13 K. At lower temperatures, correlated spin dynamics emerge, influencing relaxation processes in this spin ice material.

Area of Science:

  • Condensed Matter Physics
  • Quantum Magnetism
  • Materials Science

Background:

  • Spin ice materials like Dy2Ti2O7 exhibit complex magnetic behaviors.
  • Understanding spin relaxation dynamics is crucial for their potential applications.

Purpose of the Study:

  • To investigate spin relaxation mechanisms in Dy2Ti2O7.
  • To determine the temperature and magnetic field dependence of spin relaxation time (tau).

Main Methods:

  • Measurements of ac magnetic susceptibility.
  • Analysis of spin relaxation time (tau) as a function of temperature and magnetic field.

Main Results:

  • Spin relaxation is thermally activated at high temperatures.
  • Below approximately 13 K, tau becomes temperature-independent, indicating quantum tunneling dominance.

Related Experiment Videos

  • A sharp increase in tau below approximately 4 K suggests the emergence of collective spin correlations.

    • Conclusions:

    • Quantum tunneling is the primary spin relaxation mechanism in Dy2Ti2O7 at low temperatures.
    • The development of the spin ice state below 4 K introduces collective degrees of freedom that influence relaxation.