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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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From Mott state to superconductivity in 1T-TaS2.

B Sipos1, A F Kusmartseva, A Akrap

  • 1Ecole Polytechnique Fédérale de Lausanne, IPMC, CH-1015 Lausanne, Switzerland. bsipos@gmail.com

Nature Materials
|November 11, 2008
PubMed
Summary

Superconductivity emerges in 1T-TaS(2) under pressure, coexisting with a charge-density wave (CDW) and persisting even after the CDW vanishes. This discovery opens new avenues for understanding electronic states in layered materials.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • Investigating the coexistence of superconductivity with other electronic states is key to discovering novel quantum materials.
  • 1T-TaS(2), a transition-metal dichalcogenide (TMD), is unique for exhibiting a Mott phase, but its electronic phase diagram under pressure remains underexplored.

Purpose of the Study:

  • To explore the low-temperature electronic phase diagram of 1T-TaS(2) under applied pressure.
  • To investigate the emergence and coexistence of superconductivity with other electronic orders, specifically charge-density waves (CDWs).

Main Methods:

  • High-pressure experimental techniques were applied to study the electronic properties of 1T-TaS(2).
  • Analysis focused on the evolution of the Mott phase, CDW state, and superconductivity as a function of pressure.

Main Results:

  • Under pressure, the Mott phase in 1T-TaS(2) transitions into a textured charge-density wave (CDW) state.
  • Superconductivity emerges within the CDW state and persists to high pressures, even after the CDW disappears.
  • This marks the first observation of superconductivity in a pristine 1T-TMD material, showing robustness against normal state changes.

Conclusions:

  • Superconductivity in 1T-TaS(2) originates within a phase-separated electronic state driven by commensurability and Coulomb frustration.
  • The findings provide critical insights into the interplay between CDW, Mott physics, and superconductivity in layered materials.