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Related Experiment Videos

Bose-glass phases in disordered quantum magnets.

Omid Nohadani1, Stefan Wessel, Stephan Haas

  • 1Department of Physics and Astronomy, University of Southern California, Los Angeles, California 90089-0484, USA.

Physical Review Letters
|December 31, 2005
PubMed
Summary

Disordered spin systems exhibit unique Bose-glass phases during transitions into and out of magnetic-field-induced order. This glassiness arises from localized triplons, leading to finite compressibility in these intermediate regimes.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Magnetism

Background:

  • Disordered spin systems with antiferromagnetic Heisenberg exchange display complex behavior under magnetic fields.
  • Transitions between magnetic phases in such systems can involve unique intermediate regimes.

Purpose of the Study:

  • To investigate the nature of intermediate phases in disordered spin systems undergoing transitions into and out of magnetic-field-induced order.
  • To determine the underlying mechanism for the observed unique regimes.

Main Methods:

  • Utilized quantum Monte Carlo simulations.
  • Studied the zero-temperature behavior of the spin systems.

Main Results:

  • Identified the intermediate regions as Bose-glass phases.

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  • Demonstrated that localized field-induced triplons are responsible for the glassiness.
  • Showed that triplon localization leads to finite compressibility.

    • Conclusions:

    • The unique regimes observed are Bose-glass phases.
    • Triplon localization in disordered spin systems induces finite compressibility and glassiness.
    • This provides a microscopic understanding of field-induced magnetic transitions.