Paramagnetic resonance and near-infrared optical absorption of SrTiO3:Ir4+

The ESR of the first 5d ion (5d5 in a strong cubic crystal field) identified in SrTiO3, Ir4+, is observed at g approximately=1.6 with a slight temperature-dependent tetragonal anisotropy. Due to high covalency, the orbital reduction factor is rather small: k=0.5 to 0.7, meaning that the amplitude of the wavefunction is higher at the ligands than at the central ion, in line with recent results for covalent semiconductors.

[1]  K. Müller,et al.  Characteristic Structural Phase Transition in Perovskite-Type Compounds , 1968 .

[2]  A. Abragam,et al.  Electron paramagnetic resonance of transition ions , 1970 .

[3]  J. Thornley,et al.  The magnetic properties of (IrX6)2- complexes , 1968 .

[4]  I. .. Douglas,et al.  Optical Spectra of IrCl62− in Single Crystals of Cs2ZrCl6, Cs2HfCl6, and K2SnCl6 at Low Temperatures , 1969 .

[5]  A. Freeman,et al.  Hyperfine Interactions in the 5d Transition Series , 1970 .

[6]  K. A. Schroeder.  Spin‐Orbit Matrices of the d5 Configuration , 1962 .

[7]  K. W. Blazey,et al.  Paramagnetic resonance and optical absorption of Co4+ in SrTiO3 , 1983 .

[8]  B. Bleaney,et al.  Paramagnetic Resonance in some Complex Cyanides of the Iron Group II. Theory , 1956 .

[9]  W. Stirling.  Neutron inelastic scattering study of the lattice dynamics of strontium titanate: harmonic models , 1972 .

[10]  K. Müller.  Paramagnetic point and pair defects in oxide perovskites , 1981 .

[11]  W. Tolksdorf,et al.  Optical Absorption, Fluorescence, and Electron Spin Resonance of Ir4+ on Octahedral Sites in Y3Ga5O12 , 1976 .

[12]  A. Raizman,et al.  Electron paramagnetic resonance of Ir 4+ ions in MgO and CaO , 1980 .

[13]  Y. Tanabe,et al.  On the absorption spectra of complex ions. II , 2002 .

[14]  T. O'reilly,et al.  Molecular Orbital Calculation for Trigonally Distorted Octahedral Complexes , 1971 .

[15]  J. G. Skinner,et al.  Raman Spectrum of Strontium Titanate , 1968 .