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19 April 2024 |
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Article overview
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Local increase of symmetry on cooling in KNi$_2$Se$_2 | | James R. Neilson
; Natalia Drichko
; Anna Llobet
; Mali Balasubramanian
; Matthew R. Suchomel
; Tyrel M. McQueen
; | | Date: |
25 Oct 2013 | | Abstract: | KNi$_2$Se$_2$ exhibits an increase of symmetry on cooling below $Tle50$ 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 $Tle50$K. Together, these results support many- body correlation
effects as drivers for the unusual heavy fermion electronic ground state in
KNi$_2$Se$_2$. | | Source: | arXiv, 1310.6828 | | Services: | Forum | Review | PDF | Favorites | |
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