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Pressure-induced metallization in layered ReSe2
P G Naumov1,2, M A ElGhazali1,3, H Mirhosseini1
1Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany.
Journal of Physics. Condensed Matter : an Institute of Physics Journal
|December 20, 2017
Summary
High pressure transforms rhenium diselenide (ReSe2) into a metallic phase around 35 GPa. Superconductivity may arise from internal stresses, not intrinsic ReSe2 properties, under extreme compression.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Solid State Chemistry
Background:
- Rhenium diselenide (ReSe2) is a layered transition metal dichalcogenide with a distorted crystal structure.
- Understanding its behavior under extreme conditions is crucial for novel electronic applications.
Purpose of the Study:
- To investigate the high-pressure structural and electrical properties of ReSe2.
- To determine the pressure-induced phase transitions and metallization in ReSe2.
- To explore the potential for superconductivity in compressed ReSe2.
Main Methods:
- High-pressure Raman spectroscopy up to ~90 GPa.
- Electrical resistivity measurements under varying loading conditions.
- Ab initio electronic band structure calculations.
Main Results:
- An isostructural phase transition due to layer sliding observed at ~7 GPa, stabilizing the distorted 1T-phase.
- Pressure-induced metallization of ReSe2 occurs around 35 GPa, transitioning from a direct band gap semiconductor.
- Emergence of superconductivity was observed, but likely attributed to internal stresses rather than intrinsic ReSe2 properties.
Conclusions:
- ReSe2 exhibits significant structural and electronic property changes under high pressure.
- The observed metallization and potential superconductivity are strongly influenced by pressure-induced stresses.
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