Optical Evidence for Symmetry Changes above the Néel Temperature of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>KCuF</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>J. Deisenhofer, D. van der Marel, M. V. Erëmin et al.|Physical Review Letters|2008Cited by 50