Bromine nuclear magnetic resonance in antiferromagnetic MnBr2·4H2O

The Br nuclear magnetic resonance spectra have been examined in antiferromagnetic MnBr2 ·4H2O at temperatures down to 0.4 K. In the frequency range 10-90 MHz 12 Br resonances were observed. Methods are described to determine the magnitude and orientation of the internal magnetic field at the bromine nucleus

Magnetic-resonance study of the diluted magnetic semiconductor Pb1-x-ySnyMnxTe

Electron paramagnetic resonance (EPR) was investigated in samples of the magnetically diluted semiconductor Pb1-x-ySnyMnxTe in the temperature range T=1.3 100 K. The samples had compositions in the range x=0.005 0.06,y=0.12 0.72 and carrier concentrations between p=1.6×1019 and 1.4×1021 cm-3. The temperature dependence of the EPR linewidth is strongly dependent on the carrier concentration. This can be understood within the framework of the Korringa relaxation mechanism and the two-valence-band model of magnetic properties of these crystals. For samples with high carrier concentrations (ferromagnetic at low temperatures) we obtained an s-d exchange integral of Jsd=33 2 meV. The role of metal vacancies in the effect of electron bottleneck of the EPR is also discussed