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Pressure-Induced Dome-Like Superconductivity and Unusual Charge-Density-Wave-Like Transition in Th2Cu4As5.
Yuqing Zhang1, Ye Yang2, Xikai Wen1
1Hefei National Laboratory for Physical Sciences at Microscale and Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
Journal of the American Chemical Society
|May 14, 2025
Summary
High pressure reveals complex electronic states in Th2Cu4As5. Superconductivity is enhanced then suppressed by charge density waves (CDW), with a new CDW state emerging at high pressures.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Solid-State Chemistry
Background:
- The Th2Cu4As5 material exhibits both superconductivity and charge density wave (CDW) orders.
- These phenomena may arise from distinct structural units, offering a unique platform to study their interplay.
Purpose of the Study:
- To investigate the evolution of CDW and superconductivity in Th2Cu4As5 under high pressure.
- To explore the relationship between pressure-induced CDW states and superconductivity.
Main Methods:
- High-pressure electrical transport measurements.
- High-pressure X-ray diffraction measurements.
Main Results:
- Superconductivity initially enhances with CDW suppression, then decreases, showing dome-like behavior.
- A novel 2 × 2 × 5 superlattice, indicative of an unusual CDW state, emerges above 8 GPa.
- This new CDW state coincides with a sudden loss of superconductivity.
Conclusions:
- Th2Cu4As5 displays versatile CDW states under pressure.
- The findings provide a rare opportunity to study the interplay between multiple electronic ordered states.
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