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Related Experiment Videos

Gapless spin liquid behavior in two-dimensional solid 3He.

Ryuichi Masutomi1, Yoshitomo Karaki, Hidehiko Ishimoto

  • 1The Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan.

Physical Review Letters
|February 3, 2004
PubMed
Summary

Researchers studied two-dimensional solid helium-3 (3He) using direct demagnetization. Results suggest a quantum spin liquid ground state in the antiferromagnetic phase, with a spin gap below 10 microKelvin.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Magnetism
  • Low-Temperature Physics

Background:

  • Two-dimensional (2D) solid helium-3 (3He) exhibits complex magnetic behaviors.
  • Understanding the ground state of 2D magnetic systems is crucial for quantum physics.
  • Previous studies hinted at exotic magnetic phases in adsorbed 3He.

Purpose of the Study:

  • To investigate the magnetic properties of 2D solid 3He in both paramagnetic and antiferromagnetic phases.
  • To determine the ground state of the triangular antiferromagnet with higher-order multiple exchange.
  • To explore the possibility of a quantum spin liquid state at ultra-low temperatures.

Main Methods:

  • Direct demagnetization technique applied to 2D solid 3He.
  • Measurements conducted at temperatures as low as 10 microKelvin.

Related Experiment Videos

  • Adsorption of 3He on 4He and HD preplated graphite substrates.

    • Main Results:

    • Observed magnetization in paramagnetic solid 3He consistent with temperatures around 10 microKelvin.
    • Magnetization of antiferromagnetic solid 3He gradually increased up to 10 microKelvin.
    • The 4/7 phase adsorbed on specific substrates showed this behavior.

    Conclusions:

    • The experimental data strongly suggests a quantum spin liquid ground state for the triangular antiferromagnet.
    • The spin gap is nearly zero or extremely small, less than 10 microKelvin.
    • Higher-order multiple exchange interactions are likely responsible for this quantum state.