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Quantum spin glass and the dipolar interaction.

Moshe Schechter1, Nicolas Laflorencie

  • 1Department of Physics and Astronomy, University of British Columbia, Vancouver, BC, Canada, V6T 1Z1.

Physical Review Letters
|October 10, 2006
PubMed
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Anisotropic dipolar systems do not exhibit true spin-glass order in a transverse magnetic field. Off-diagonal interactions destroy this order, leading to a crossover to the paramagnetic phase, not quantum criticality.

Area of Science:

  • Condensed matter physics
  • Quantum magnetism

Background:

  • Anisotropic dipolar systems serve as experimental models for the transverse field Ising model.
  • The transverse field Ising model predicts a spin glass to paramagnet phase transition with random interactions.

Purpose of the Study:

  • To investigate the effect of off-diagonal dipolar interactions on spin-glass order in anisotropic systems.
  • To explain experimental observations in LiHo(x)Y(1-x)F(4) regarding phase transitions.

Main Methods:

  • Theoretical analysis of anisotropic dipolar systems in an external magnetic field.
  • Investigating the role of off-diagonal interactions in correlation length and spin-glass order.

Main Results:

  • Off-diagonal dipolar interactions, even when reduced, induce a finite correlation length.

Related Experiment Videos

  • This finite correlation length prevents the establishment of spin-glass order at any finite transverse field.

    • Conclusions:

    • The observed behavior in LiHo(x)Y(1-x)F(4) is a crossover to the paramagnetic phase.
    • Quantum criticality is not observed due to the destructive effect of dipolar interactions on spin-glass order.