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Related Experiment Videos

Field-induced dynamic diamagnetism in a charge-density-wave system.

N Harrison1, C H Mielke, A D Christianson

  • 1National High Magnetic Field Laboratory, LANL, MS-E536, Los Alamos, New Mexico 87545, USA.

Physical Review Letters
|April 6, 2001
PubMed
Summary

This study shows magnetic hysteresis in a charge-density-wave compound is diamagnetic, suggesting dissipationless conductivity. These findings support the presence of persistent currents in this phase.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • Charge-density-wave (CDW) compounds exhibit complex electronic properties.
  • Understanding conductivity mechanisms in CDW phases is crucial for materials science.

Purpose of the Study:

  • To investigate the nature of magnetic hysteresis in alpha-(BEDT-TTF)(2)-KHg(SCN)(4) above the Pauli paramagnetic limit.
  • To determine if observed hysteresis is consistent with diamagnetism and induced currents, indicative of dissipationless conductivity.

Main Methods:

  • AC susceptibility measurements were performed on the CDW compound alpha-(BEDT-TTF)(2)-KHg(SCN)(4).
  • Measurements were conducted at high magnetic fields (μ₀H > 23 T), exceeding the Pauli paramagnetic limit.

Main Results:

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  • Magnetic hysteresis observed in the CDW phase was unambiguously identified as diamagnetic.
  • The diamagnetic hysteresis can only be explained by the presence of induced currents within the material.
  • Experimental evidence strongly supports the occurrence of dissipationless conductivity in this phase.

    • Conclusions:

    • The diamagnetic nature of magnetic hysteresis indicates the presence of persistent, dissipationless currents.
    • The findings provide a strong case for superconductivity-like behavior in this charge-density-wave compound.