Dielectric Dispersion in KH₂PO₄ below 10 K

Abstract

Complex dielectric constants of KH₂PO₄ along the c- and a-axes have been measured in the frequency range from 10 Hz to 20 kHz. Dielectric dispersions of relaxation type with small loss peaks have been observed at temperatures below 10 K in both directions. Arrhenius plots of the relaxation frequencies give extremely small values of activation energies, 0.014 eV for the c-axis and 0.004 eV for the a-axis, respectively.