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Metallization of Quantum Material GaTa 4 Se 8 at High Pressure.
- Source :
-
The journal of physical chemistry letters [J Phys Chem Lett] 2021 Jun 17; Vol. 12 (23), pp. 5601-5607. Date of Electronic Publication: 2021 Jun 10. - Publication Year :
- 2021
-
Abstract
- Pressure is a unique thermodynamic variable to explore the phase competitions and novel phases inaccessible at ambient conditions. The resistive switching material GaTa <subscript>4</subscript> Se <subscript>8</subscript> displays several quantum phases under pressure, such as a J <subscript>eff</subscript> = 3/2 Mott insulator, a correlated quantum magnetic metal, and d -wave topological superconductivity, which has recently drawn considerable interest. Using high-pressure Raman spectroscopy, X-ray diffraction, extended X-ray absorption, transport measurements, and theoretical calculations, we reveal a complex phase diagram for GaTa <subscript>4</subscript> Se <subscript>8</subscript> at pressures exceeding 50 GPa. In this previously unattained pressure regime, GaTa <subscript>4</subscript> Se <subscript>8</subscript> ranges from a Mott insulator to a metallic phase and exhibits superconducting phases. In contrast to previous studies, we unveil a hidden correlation between the structural distortion and band gap prior to the insulator-to-metal transition, and the metallic phase shows superconductivity with structural and magnetic properties that are distinctive from the lower-pressure phase. These discoveries highlight that GaTa <subscript>4</subscript> Se <subscript>8</subscript> is a unique material to probe novel quantum phases from a structural, metallicity, magnetism, and superconductivity perspective.
Details
- Language :
- English
- ISSN :
- 1948-7185
- Volume :
- 12
- Issue :
- 23
- Database :
- MEDLINE
- Journal :
- The journal of physical chemistry letters
- Publication Type :
- Academic Journal
- Accession number :
- 34110170
- Full Text :
- https://doi.org/10.1021/acs.jpclett.1c01069