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- Title
四方相FeS 超导体的高压调控研究.
- Authors
孙建平; 杨芃焘; 刘少博; 周 放; 董晓莉; 闻海虎; 程金光
- Abstract
High-pressure regulation has played an important role in enhancing the superconducting transition temperature (Tc) and revealing the competing electronic orders and superconducting mechanisms of iron-based superconductors. A large number of high-pressure studies have shown that different pressure conditions (hydrostatic vs. non-hydrostatic pressure) can make great differences in the physical properties of condensed matters under high pressure. To unveil the discrepancies of different high-pressure studies on tetragonal FeS, we performed high-pressure magnetic susceptibility and resistivity measurements on tetragonal FeS single crystal up to 11 GPa by using a piston-cylinder and a cubic anvil cell that can produce good hydrostatic pressures. It is found that its Tc decreases monotonically with increasing pressure with a slope of dTc/dp≈-1.5 K/GPa, which indicates that the superconductivity can be completely suppressed at about 3 GPa. When the tetragonal-hexagonal structural phase transition occurs at about 4-5 GPa, the temperature-dependent resistivity changes from metallic to semiconducting behavior, and the resistivity shows continuous increase upon further increasing pressure. No second superconducting phase was observed up to 11 GPa, and our results thus do not support the conclusion that FeS has two superconducting phases at high pressure. Finally, in light of the structural information under pressure, we discussed briefly the underlying mechanism for the distinct pressure evolutions of the physical properties in FeS and FeSe.
- Subjects
SUPERCONDUCTING transition temperature; IRON-based superconductors; PROPERTIES of matter; PHASE transitions; HYDROSTATIC pressure; MAGNETIC susceptibility
- Publication
Chinese Journal of High Pressure Physics, 2022, Vol 36, Issue 6, p1
- ISSN
1000-5773
- Publication type
Article
- DOI
10.11858/gywlxb.20220677