Electron Spin Resonance Spectra of Fe3+ Ions in SrLaAlO4 and SrLaGaO4 High-Tc Substrates |
| R. Jabłońskia and A. Pajączkowskaa,b aInstitute of Electronic Materials Technology, Wólczyńska 133, 01-919 Warsaw, Poland bInstitute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 00-668 Warsaw, Poland |
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| New results concerning paramagnetic defects in SrLaAlO4 and SrLaGaO4 high-Tc substrates connected with unavoidable impurity Fe3+ are reported. The identification was checked by measuring the spectra in SrLaAlO4 crystals intentionally doped with 0.5 at.% Fe. Angular dependences of three lines were distinguished at X-band frequency in the temperature range from 4 K to 300 K. We attribute these lines to the transitions inside the doublets ±1/2, and "forbidden" doublets ±3/2, ±5/2, respectively. By diagonalization of spin-Hamiltonian, parameters |D| > 1.2 cm-1, |E| ≈ 0.1 cm-1 and gx=gy=gz= 1.987(13) for SrLaAlO4 and SrLaGaO4 were calculated and within the margin of error they were of the same value. |
| DOI: 10.12693/APhysPolA.92.173 PACS numbers: 76.30.-v, 61.72.Hh |