Softening of the characteristic Einstein vibrational frequency of rare-earth atoms in the isostructural hexaborate series LnB6 Chernyshev, D. Yu. ; Korsukova, M. M. ; Malyshev, A. L. ; Gurin, V. N. ; Trunov, V. A. ; Chernyshev, V. V. ; Aslanov, L. A. Abstract Publication: Physics of the Solid State Pub Date: April 1994 Bibcode: 1994PhSS...36..585C