EPR MEASUREMENTS OF THE SPIN-HAMILTONIAN ZERO-FIELD SPLITTING PARAMETERS AS A FUNCTION OF TEMPERATURE IN MN2-DOPED CS2NALACL6()

The spin-Hamiltonian zero-field splitting parameter b(2)(0) is measure d as a function of temperature in Mn2+ doped Cs2NaLaCl6 single crystal s (elpasolite type). The experiments showed that the Mn2+ ion occupies two different tetragonal symmetry sites in the cubic crystalline latt ice of Cs2NaLaCl6. Both sites possess principal Zaxes along (100) crys tallographic directions. Electron spin resonance measurements were mad e at X-band frequencies (9.2 GHz) in the temperature range from 12.8 t o 300 K. The present results are taken into account in order to establ ish a possible relation between the spin-Hamiltonian parameter b(2)(0) and the temperature. A tentative determination of the Debye temperatu re is derived from the experimental data. (C) 1997 Elsevier Science Lt d.