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Continuous and discontinuous quantum phase transitions in a model two-dimensional magnet.

S Haravifard1, A Banerjee, J C Lang

  • 1Advanced Photon Source, Argonne National Laboratory, 9700 S Cass Avenue, Argonne, IL 60439, USA.

Proceedings of the National Academy of Sciences of the United States of America
|February 7, 2012
PubMed
Summary

Researchers studied the Shastry-Sutherland model in SrCu(2)(BO(3))(2) under pressure. They observed a quantum phase transition where the singlet-triplet gap closes, leading to a structural distortion.

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Area of Science:

  • Condensed matter physics
  • Quantum magnetism

Background:

  • The Shastry-Sutherland model exhibits unique quantum properties at the boundary of gapped excitations and ordered states.
  • SrCu(2)(BO(3))(2) is a model material for studying the Shastry-Sutherland physics.

Purpose of the Study:

  • To investigate the effects of hydrostatic pressure on the Shastry-Sutherland material SrCu(2)(BO(3))(2).
  • To tune coupling energies and probe the quantum phase transition between magnetic states.

Main Methods:

  • High-resolution X-ray diffraction measurements were performed using a diamond anvil cell at cryogenic temperatures.
  • Spin-lattice coupling was monitored to track magnetic behavior and structural changes.

Main Results:

  • A strong spin-lattice coupling was observed, enabling precise monitoring of magnetic and structural properties.
  • The singlet-triplet gap energy continuously decreased with increasing pressure, vanishing at 2 GPa.
  • A structural distortion occurred at pressures above the quantum phase transition.

Conclusions:

  • The study demonstrates a continuous quantum phase transition in SrCu(2)(BO(3))(2) driven by pressure.
  • Pressure-induced changes in spin-lattice coupling provide insights into the material's magnetic and structural behavior.