Pressure and temperature electron paramagnetic resonance studies of crystal

Abstract

The effect of temperature and hydrostatic pressure on the spin-Hamiltonian parameter for in elpasolite is studied up to a pressure of 700 MPa over the temperature range 180 - 360 K. It is found that 56% of the temperature change in is caused by the spin - phonon interaction, and the remaining 44% is related to the thermal expansion of the crystal. The temperature at which the phase transition from the cubic to the tetragonal phase occurs is a linear function of pressure, with the pressure coefficient . The dependence of on the lattice constant and hydrostatic pressure is interpreted within the rigid-sphere model. No precursive behaviour above is observed.

An investigation on the temperature dependent zero-field splitting (ZFS) of Mn2+ doped Cs2NaLaCl6

“…it was found that most of the temperature change in b 0 4 was induced by the spin-phonon interaction, while the remaining was related to the thermal expansion of the crystal [32]. The anomaly, related with both ZFSPs (b 0 2 and b 0 4 ) and distortion parameters, seen here for the both centers between 123 and 213 K is consistent with the suggested phase transition temperatures elsewhere [30][31][32].…”

“…The anomaly, related with both ZFSPs (b 0 2 and b 0 4 ) and distortion parameters, seen here for the both centers between 123 and 213 K is consistent with the suggested phase transition temperatures elsewhere [30][31][32]. It should be noted that phase transitions would result in drastic changes at the transition temperature in the EPR spectra, such as: line splitting, linewidth or spin Hamiltonian parameters [8].…”

An investigation of the spin-Hamiltonian parameters for Gd3+-doped YBa2Cu3O6+y(y= 0.06) superconductor

“…(ii) The influence of higher-order multiplets on the splittings of ground multiplets 8 S 7/2 is not considered. (iii) The spin-Hamiltonian parameters of a paramagnetic center in crystals at various temperatures stem from two contributions: one is the implicit or static contribution concerning the defect structure of the paramagnetic center and another is the explicit or vibrational contribution due to the electron-phonon interaction [39][40][41][42][43]. The latter is omitted in the calculation.…”