Paramagnetic resonance and relaxation of Cu²⁺ and Ni³⁺ in MgO and CaO: The determination of Jahn-Teller energy splittings

S. Riegel, R. Wengenmayr, et al.

Physical Review Letters

J.G. Bednorz, T. Takashige, et al.

EPL

J.G. Bednorz, K.A. Müller

Physica B+C

P. Pfluger, K.A. Müller, et al.

Synthetic Metals