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Strange metal from a frustration-driven charge order instability.

T Sato1,2, K Kitai3, K Miyagawa3

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Summary
This summary is machine-generated.

Geometrical frustration in organic conductors can destabilize charge ordering (CO). This study reveals frustration-induced fluctuations leading to strange metallic behavior and potential quantum melting of charges, analogous to spin liquids.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Organic Electronics

Background:

  • Geometrical frustration in lattices can disrupt cooperative interparticle interactions.
  • This frustration can destabilize charge ordering (CO) into states like charge glass (CG) or lead to quantum melting.
  • Organic conductors with triangular lattices are susceptible to these phenomena.

Purpose of the Study:

  • To investigate charge dynamics in triangular-lattice organic conductors near charge ordering or charge glass states.
  • To explore the effects of geometrical frustration on charge states and transport properties.
  • To provide experimental evidence for frustration-induced quantum melting of charges.

Main Methods:

  • Direct current (d.c.) charge transport measurements.
  • Noise spectroscopy.
  • Application of uniaxial stress to modulate geometrical frustration.

Main Results:

  • Observed a strange metal phase with unusual charge dynamics attributed to frustration-induced fluctuations of CO or CG.
  • Demonstrated that anomalous charge fluctuations can be suppressed into an insulating state by applying uniaxial stress, reducing frustration.
  • Provided experimental evidence supporting the theoretical concept of frustration-induced quantum melting of charges.

Conclusions:

  • Geometrical frustration plays a critical role in the emergence of exotic charge states in organic conductors.
  • The observed strange metal behavior is linked to fluctuations of frustrated charge orders.
  • The findings suggest a quantum melting of charges analogous to spin liquid behavior in frustrated systems.