Local increase of symmetry on cooling in KNi${}_2$Se$_2

James R. Neilson, Natalia Drichko, Anna Llobet +3

KNi${}_2$Se${}_2$ exhibits an increase of symmetry on cooling below $T\le 50$ K, as observed by Raman spectroscopy and synchrotron x-ray diffraction. X-ray absorption spectroscopy confi…