Theory and experiment of the ESR of Co$^{2+}$ in Zn$_2$ % (OH)PO$_4$ and Mg$_2$(OH)AsO$_4$

M. E. Foglio; M. C dos Santos; G. E. Barberis; J. M. Rojo; J. L. Mesa; L. Lezama; T. Rojo

doi:10.1016/S0921-4526(02)00765-2

paper

Theory and experiment of the ESR of Co $^{2 +}$ in Zn $_{2}$ % (OH)PO $_{4}$ and Mg $_{2}$ (OH)AsO $_{4}$

arXiv:cond-mat/0110563 · doi:10.1016/S0921-4526(02)00765-2

Abstract

Experiments of Electron Spin Resonance (ESR) were performed on Co substituting Zn $^{2 +}$ or Mg $^{2 +}$ in powder samples of Zn $_{2}$ (OH)PO $_{4}$ and Mg $_{2}$ (OH)AsO $_{4}$ . The observed resonances are described with a theoretical model that considers the departures from the two perfect structures. It is shown that the resonance in the penta-coordinated complex is allowed, and the crystal fields that would describe the resonance of the Co $^{2 +}$ in the two environments are calculated. The small intensity of the resonance in the penta-coordinated complex is explained assuming that this site is much less populated than the octahedral one; this assumption was verified by a molecular calculation of the energies of the two environments, with both Co and Zn as central ions in Zn $_{2}$ (OH)PO $_{4}$ .

43 pages, LaTex file, 6 figures, EPS. submitted to Journal of Physics Condense

Theory and experiment of the ESR of Co2+ in Zn2​ % (OH)PO4​ and Mg2​(OH)AsO4​

Abstract

Theory and experiment of the ESR of Co $^{2 +}$ in Zn $_{2}$ % (OH)PO $_{4}$ and Mg $_{2}$ (OH)AsO $_{4}$