Superconductivity and multiple pressure-induced phases in BaPtAs
arXiv:1610.07465 · doi:10.1103/PhysRevB.94.184506
Abstract
The newly discovered BaPtAs 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 (CDW) 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, BaPtAs 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 . These findings demonstrate that BaPtAs is a promising new system for studying competing interactions and the relationship between high-temperature electronic instabilities and superconductivity.
6 pages, 5 figures
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