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Proximate Quantum Spin Liquid on Designer Lattice.

Xiaoran Liu1, Sobhit Singh1, Victor Drouin-Touchette1

  • 1Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, United States.

Nano Letters
|February 22, 2021
PubMed
Summary
This summary is machine-generated.

Researchers created a novel designer lattice exhibiting extreme magnetic frustration, potentially realizing a quantum spin liquid state. Experiments and calculations show no spin ordering down to 0.03 K, indicating persistent spin fluctuations and a proximate quantum spin liquid state.

Keywords:
emergent magnetismfrustrationspin liquidsultrathin films

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Magnetism

Background:

  • Quantum spin liquids (QSLs) are exotic states of matter with long-range quantum entanglement but no magnetic ordering.
  • Achieving QSLs experimentally is challenging due to the need for specific lattice geometries and strong magnetic interactions.
  • Frustrated magnetic systems offer a promising route to realizing QSL states.

Purpose of the Study:

  • To propose and experimentally realize a designer lattice with extremely high magnetic frustration.
  • To investigate the possibility of a quantum spin liquid state in this novel material.
  • To understand the magnetic properties and ground states through experimental and theoretical approaches.

Main Methods:

  • Fabrication of an ultrathin (111) CoCr2O4 slice with alternating triangular and kagome cation planes.
  • Low-temperature magnetic susceptibility measurements down to 0.03 K.
  • Low-energy muon spin relaxation (LE-μSR) to probe spin dynamics.
  • First-principles theoretical calculations to determine magnetic ground states and interactions.

Main Results:

  • The synthesized CoCr2O4 lattice exhibited no spin ordering or freezing transition down to 0.03 K.
  • Strong antiferromagnetic correlations (energy scale ~30 K) and a high frustration factor (~1000) were observed.
  • Persistent spin fluctuations were detected at low temperatures using LE-μSR.
  • Theoretical calculations revealed highly degenerate magnetic ground states at 0 K due to competing exchange interactions.

Conclusions:

  • The ultrathin CoCr2O4 lattice demonstrates characteristics consistent with a proximate quantum spin liquid state.
  • The designer lattice effectively suppresses conventional magnetic ordering through extreme frustration.
  • This work provides a promising platform for the experimental realization and study of quantum spin liquid phenomena.