Year: 2016
Type: article
Abstract: The recently discovered ${\mathrm{BaPt}}_{2}{\mathrm{As}}_{2}$ 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 $\ensuremath{\simeq}275$ K. Upon applying pressure, ${\mathrm{BaPt}}_{2}{\mathrm{As}}_{2}$ 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 ${T}_{c}$. These findings demonstrate that ${\mathrm{BaPt}}_{2}{\mathrm{As}}_{2}$ is a promising system for studying competing interactions and the relationship between high-temperature electronic instabilities and superconductivity.
Institutions: Zhejiang University, Argonne National Laboratory, Carnegie Institution for Science, Center for High Pressure Science and Technology Advanced Research, Center for High Pressure Science & Technology Advanced Research, Geophysical Laboratory, Northwestern University, Collaborative Innovation Center of Advanced Microstructures
Language: Latvian
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
Awards: G102163711, G4579453702, G8232482163
OpenAlex ID: W2545968413