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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

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Decompression-Driven Superconductivity Enhancement in In₂ Se₃.

Feng Ke¹, Haini Dong^1,2, Yabin Chen³

¹Center for High Pressure Science and Technology Advanced Research, Shanghai, 201203, China.

Advanced Materials (Deerfield Beach, Fla.)

|July 11, 2017

Summary

This summary is machine-generated.

Superconductivity in indium selenide (In2Se3) was unexpectedly enhanced upon decompression, reaching a critical temperature of 8.2 K. This discovery suggests maintaining superconductivity at lower pressures.

Keywords:

layered materials phonon-modulated superconductivity pressure structural transition superconductivity enhancement

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Published on: July 8, 2021

Area of Science:

Condensed Matter Physics
Materials Science
Superconductivity Research

Background:

Indium selenide (In2Se3) is a layered chalcogenide material.
Superconductivity is a phenomenon observed in certain materials at low temperatures and high pressures.
Understanding pressure-induced phase transitions is crucial for discovering new superconducting materials.

Purpose of the Study:

To investigate the superconducting properties of indium selenide (In2Se3) under varying pressure conditions.
To explore the effect of pressure-induced structural transitions on superconductivity.
To determine if superconductivity can be enhanced or maintained during pressure release.

Main Methods:

High-pressure experiments were conducted on In2Se3.
Superconductivity was measured by monitoring critical temperature (Tc) as a function of pressure.
Structural transitions were analyzed in conjunction with superconducting properties during compression and decompression.

Main Results:

Superconductivity onset in In2Se3 was observed at 41.3 GPa with a Tc of 3.7 K, peaking at 47.1 GPa.
A significant enhancement of superconductivity was observed during decompression, with Tc reaching 8.2 K at 10.7 GPa.
The pressure-quenched superconducting state persisted in the same crystal structure (I-43d) as observed under compression.

Conclusions:

The enhancement of superconductivity during decompression is attributed to pressure-induced structural transitions (R-3m to I-43d), phonon softening, and carrier concentration variations.
This study demonstrates a novel route to enhance superconductivity through controlled decompression.
The findings suggest the possibility of achieving enhanced superconducting performance at lower or ambient pressures.