Electron paramagnetic resonance of Cu 2+ in PbTiO 3

Abstract

The electron paramagnetic resonance spectrum of Cu 2+ in tetragonal-phase single-crystal lead titanate has been studied at 9.8 GHz. An axial spectrum with ¦g ∥¦ = 2.340(1) and ¦g ⊥¦ = 2.058(1) was measured and fitted using the spin-Hamiltonian parameters ¦ 63A ∥¦ = 155(2) × 10 −4 cm −1 , ¦ 63A ⊥¦ = 5.4(2.0) × 10 −4 cm −1, ¦ 65A ∥¦ = 166(2) × 10 −4 cm −1, and ¦ 65A ∥¦ = 5.8(2.0) × 10 −4 cm −1 . The observed g-values are consistent with a d 9-configuration ion at a tetragonally distorted octahedral site from which it is inferred that Cu 2+ substitutes at the Ti-site.