Local increase of symmetry on cooling in KNi2Se$2
Abstract
KNi2Se2 exhibits an increase of symmetry on cooling below T50 K, as observed by Raman spectroscopy and synchrotron x-ray diffraction. X-ray absorption spectroscopy confirms that the symmetry increase is due to changes in nickel-nickel interactions and suppression of charge density wave fluctuations. Density functional theory calculations reveal a zone- boundary lattice instability that provides a model of the room-temperature x-ray pair distribution function data, but fails to describe the higher local symmetry observed for T50K. Together, these results support many- body correlation effects as drivers for the unusual heavy fermion electronic ground state in KNi2Se2.
Turn this paper into a lesson
ArcXiv compiles a structured reading guide from this paper's metadata: plain-English importance, contributions, prerequisite concepts, which sections to read first, flashcards, and a quiz. Grounded in the abstract, never invented.