Measurement of nuclear local field by adiabatic demagnetization method for CdTe/CdZnTe quantum well

The magnitude of the nuclear local field in a CdTe/CdZnTe quantum well was measured. The features of this structure are a weak natural abundance of magnetic isotopes, as well as the absence of quadrupole moments of nuclear spins. These characteristics of the nuclear spin system affect the magnitude of the nuclear local field, as well as the methods of its measurement under optical experimental conditions. We used method based on adiabatic demagnetization of an optically cooled system of nuclei. A comparative analysis of the local field measured in this work with previous results on measuring the absorption spectrum of an oscillating magnetic field power was also carried out. The local field estimate from the spectrum line width gave an underestimated value compared to that obtained in adiabatic demagnetization experiments. A theoretical calculation of the local field was performed, which also took into account all possible nuclear spin-spin interactions for CdTe with known values of the constants. The calculation results are consistent with the experimental data.