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Quantum spin-liquid in Ba3CuSb2O9epitaxial thin films.

Aswathi Kaipamangalath1, Riya Pathak1,2, Wasim Akram1

  • 1School of Physics, Indian Institute of Science Education and Research Thiruvananthapuram, Thiruvananthapuram, Kerala 695551, India.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|November 27, 2024
PubMed
Summary

Epitaxial thin films of hexagonal perovskite Ba3CuSb2O9 exhibit quantum spin liquid behavior, showing no magnetic ordering down to 400 mK. This suggests potential for quantum technologies using these novel quantum materials.

Keywords:
quantum spin-liquidspin–orbit couplingthin film

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Information Science

Background:

  • Hexagonal perovskites are promising quantum spin liquid (QSL) systems.
  • Epitaxial thin films offer controlled structures for quantum phase applications.

Purpose of the Study:

  • To fabricate and characterize epitaxial thin films of the QSL material Ba3CuSb2O9.
  • To investigate the quantum spin liquid properties of these thin films.

Main Methods:

  • Pulsed laser deposition for fabricating epitaxial Ba3CuSb2O9 thin films on MgO (100) substrates.
  • X-ray diffraction to confirm epitaxial growth.
  • Temperature-dependent magnetization and magnetic isotherm analysis.

Main Results:

  • Epitaxial growth of Ba3CuSb2O9 thin films validated by XRD.
  • No magnetic ordering observed down to 400 mK in thin films.
  • Large antiferromagnetic Curie-Weiss temperature (θCW ≈ -11.68 K) indicating magnetic frustration and QSL behavior.

Conclusions:

  • Epitaxial Ba3CuSb2O9 thin films demonstrate quantum spin liquid characteristics.
  • These findings highlight the potential of Ba3CuSb2O9 for quantum technologies.