Observation of the Jahn-Teller splitting of three-valent D7 ions via orbach relaxation

B. Berre, K. Fossheim, et al.

Physical Review Letters

K.A. Müller, K.W. Blazey, et al.

Physica B+C

F. La Mattina, J.G. Bednorz, et al.

Physical Review B - CMMP

O.-M. Nes, K.A. Müller, et al.

EPL