Abstract
The recently discovered BaPt2As2 shows a structural distortion at around 275 K, followed by the emergence of superconductivity at lower temperatures. Here we identify the presence of charge-density-wave order at room temperature and ambient pressure using single-crystal x-ray diffraction, with both a superlattice and an incommensurate modulation, where there is a change of the superlattice structure below ≃275 K. Upon applying pressure, BaPt2As2 shows a rich temperature-pressure phase diagram with multiple pressure-induced transitions at high temperatures, the emergence or disappearance of which are correlated with sudden changes in the superconducting transition temperature Tc. These findings demonstrate that BaPt2As2 is a promising system for studying competing interactions and the relationship between high-temperature electronic instabilities and superconductivity.
| Original language | English (US) |
|---|---|
| Article number | 184506 |
| Journal | Physical Review B |
| Volume | 94 |
| Issue number | 18 |
| DOIs | |
| State | Published - 2016 |
Funding
We thank C. Cao for interesting discussions. The work at Zhejiang University was supported by the National Natural Science Foundation of China (Grants No. 11474251 and No. 11374257), the National Key R&D Program of China (Grant No. 2016YFA0300202) and the Science Challenge Program of China. The work at Argonne was supported by the Office of Science, Office of Basic Energy Sciences, Division of Materials Sciences, US Department of Energy, under Contract No. DE-AC02-06CH11357 (BES-DMSE).
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics