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Related Experiment Video

Updated: May 29, 2026

Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride

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Multiple Superconducting Phases in m-TaS₃ under Extreme Compression.

Xindeng Lv¹, Zhenfang Xing^2,3, Si Wu¹

¹Institute of High-Pressure Physics, School of Physical Science and Technology, Ningbo University, Ningbo 315211, People's Republic of China.

Journal of the American Chemical Society

|May 28, 2026

Summary

Monoclinic tantalum trisulfide (m-TaS3) exhibits pressure-induced superconductivity up to 17.4 K. This record transition temperature is linked to a structural transformation enhancing electron-phonon coupling in high-pressure phases.

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Area of Science:

Condensed Matter Physics
Materials Science
Superconductivity

Background:

Quasi-one-dimensional transition metal trichalcogenides (TMTCs) are promising for studying superconductivity under extreme conditions.
Reported superconducting transition temperatures (Tc) in TMTCs are typically below 10 K.
Monoclinic TaS3 (m-TaS3) was theoretically predicted to exhibit pressure-induced superconductivity.

Purpose of the Study:

To construct the complete superconducting phase diagram of m-TaS3 under high pressure.
To investigate the mechanism behind pressure-induced superconductivity in m-TaS3.
To explore superconductivity in low-dimensional systems.

Main Methods:

In situ high-pressure transport measurements.
Synchrotron X-ray diffraction (XRD) measurements.
Construction of the superconducting phase diagram over a broad pressure range (5.7–210 GPa).

Main Results:

Three distinct superconducting regions were identified in m-TaS3.
A record superconducting transition temperature (Tc) of 17.4 K was observed in the high-pressure P21/m (HP-P21/m) phase.
An isosymmetric transformation near 88.5 GPa was associated with superconductivity enhancement.

Conclusions:

The elevated Tc in the HP-P21/m phase is attributed to structural reconfiguration and enhanced electron-phonon coupling.
The structural transformation flattens the TaS6 triangular prism, promoting uniformity and d-p orbital hybridization.
Findings provide insights into the electronic behavior of TMTCs under extreme conditions and a framework for exploring superconductivity in low-dimensional materials.