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Gapless Quantum Spin Liquid in the Triangular System Sr_{3}CuSb_{2}O_{9}.

S Kundu1, Aga Shahee1, Atasi Chakraborty2

  • 1Department of Physics, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India.

Physical Review Letters
|January 15, 2021
PubMed
Summary
This summary is machine-generated.

We discovered gapless quantum spin liquid behavior in Sr_{3}CuSb_{2}O_{9}. This material exhibits dynamic S=1/2 moments down to 65 mK, suggesting Dirac spinon excitations.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials Science

Background:

  • Quantum spin liquids (QSLs) are exotic states of matter with long-range quantum entanglement but no magnetic order.
  • Understanding QSLs is crucial for advancing quantum computing and condensed matter physics.
  • The triangular lattice geometry is a promising platform for realizing QSL states.

Purpose of the Study:

  • To investigate the magnetic properties of the layered triangular Sr_{3}CuSb_{2}O_{9} system.
  • To determine if this material exhibits quantum spin liquid behavior.
  • To characterize the nature of magnetic excitations in the system.

Main Methods:

  • X-ray diffraction to determine crystal structure and atomic ordering.
  • Muon spin relaxation (μSR) to probe magnetic dynamics at low temperatures.
  • Specific heat measurements to detect magnetic ordering and excitations.

Main Results:

  • Sr_{3}CuSb_{2}O_{9} exhibits atomic site ordering into triangular Cu planes.
  • Muon spin relaxation and specific heat measurements show no long-range magnetic order down to 65 mK.
  • Magnetic specific heat data below 5 K is consistent with Dirac spinon excitations with linear dispersion.

Conclusions:

  • The Sr_{3}CuSb_{2}O_{9} system displays gapless quantum spin liquid behavior.
  • The observed behavior supports a phenomenology of Dirac spinon excitations.
  • The estimated exchange scale aligns with theoretical calculations and high-temperature susceptibility analysis.