Pressure Effects on Zero‐Field Resonance. I. Ge³⁺ in YVO₄ and SeVO₄

Abstract

The influence of hydrostatic pressure on the zero-field resonance frequencies of Gd3+ in some isostructural crystals has been measured directly. A short description of the apparatus is given and first results in the range up t o 2 kbar are reported.Mit Hilfe der Nullfeldresonanzmethode wurde der EinfluS von hydrostatischem Druck auf die Kristallfeldaufspaltung von Gd3+ in verschiedenen Kristallen gleichen Strukturtyps direkt gemessen. Die Apparatur wird kurz beschrieben und iiber erste Ergebnisse im Bereich bis 2 kbar berichtet.

EPR Investigations of Er3+, Yb3+, and Gd3+ in Zircon-Structure Silicates

“…These constants experimentally the Gd 3 + x and z extremes for the highest satisfy the third equation in Eq. (9), and accurately large off-diagonal crystal-field terms, perturbation predict the positions of the divergencies in the powder theory will not accurately describe the lower field spectra. The absolute sign of b 2 0 was determined from sites are depicted in Fig.…”

“…The stants from the powder spectra and Eqs. (9), it is measured values of these angles for Gd 3 + in ZrSi04 and simple to calculate for X-band frequencies the largest HfSi04 are given in Table VI. The complexity of the magnetic field strength at which a ~M.=±1 transition X-band spectrum made it impossible to observe a parin a single-crystal sample will be observed with H ticular transition as the magnetic field was rotated from a z to an x axis.…”

“…Therefore, perturbation theory was sufficiently accurate to allow the spin-Hamiltonian constants to be determined. (9) where cp is the angle between the magnetic field and parallel to the x, y, or z axis. (Due to the relatively the x axis.…”

“…No attempt was made to analyze the hyperfine structure, since the spectra could be observed only in a limited range of magnetic field 1 orientations. 2 The wavefunctions describing the magnetic proper- 9 ties of the Yb 3 + ground state in tetragonal symmetry ll:! u ;::: ( 110) plane of the Er3+ orthorhombic EPR spectrum in ThSiO •.…”