Magnetic Field Dependence of AC Susceptibility of Ho2−xMxTi2O7 (M = Bi, Y) Titanates

The dependence of magnetic susceptibility in alternating fields (AC susceptibility) of rare earth titanates Ho2−xMxTi2O7 (M—Bi, Y) on the magnetic field was studied. The measurements were performed in the frequency range from 1 Hz to 1 kHz at temperatures from 1.8 K to 20 K. The conformity of the field dependence of AC susceptibility to the modified Cole–Cole formula was verified. It has been established that the characteristic field in which the real part of the AC susceptibility decreases by a factor of 2 rapidly increases with increasing temperature. A correlation was established between the field dependence of the real part of the AC susceptibility and the differential susceptibility. From the frequency dependence of the AC susceptibility, the temperature dependence of the magnetic relaxation time was determined.