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Phase Diagram for Light-Induced Superconductivity in κ-(ET)_{2}-X.

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|November 19, 2021
PubMed
Summary
This summary is machine-generated.

Photoinduced superconductivity was observed in a specific organic material, κ-(bis(ethylenedithio)tetrathiafulvalene)₂Cu[N(CN)₂]Br. This effect requires proximity to a Mott insulating phase, suggesting unique conditions for transient superconductivity.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Organic Electronics

Background:

  • Organic charge-transfer salts, such as κ-(bis(ethylenedithio)tetrathiafulvalene)₂Cu[N(CN)₂]Br, exhibit complex phase diagrams.
  • Superconductivity in these materials can be influenced by external stimuli like optical excitation.

Purpose of the Study:

  • To investigate the conditions necessary for photoinduced superconductivity in κ-(bis(ethylenedithio)tetrathiafulvalene)₂ (BEDT-TTF) based materials.
  • To explore the role of the Mott insulating phase and superconducting fluctuations in achieving non-equilibrium superconductivity.

Main Methods:

  • Optical excitation of molecular vibrations in κ-(BEDT-TTF)₂Cu[N(CN)₂]Br.
  • Systematic studies across the bandwidth-tuned phase diagram of related materials, including Mott insulators and metallic compounds.
  • Comparative analysis of photoinduced effects in κ-(BEDT-TTF)₂Cu[N(CN)₂]Cl and κ-(BEDT-TTF)₂Cu(NCS)₂.

Main Results:

  • Transient superconductinglike optical properties were induced in κ-(BEDT-TTF)₂Cu[N(CN)₂]Br at elevated temperatures.
  • Photoinduced superconductivity was exclusively observed in κ-(BEDT-TTF)₂Cu[N(CN)₂]Br, not in the studied Mott insulator or metallic compound.
  • The presence of the Mott insulating phase and superconducting fluctuations are critical for this non-equilibrium phenomenon.

Conclusions:

  • Proximity to the Mott insulating phase is a key prerequisite for observing photoinduced superconductivity in these organic materials.
  • The findings highlight the delicate interplay between electronic correlations and external stimuli in achieving exotic quantum states.