Non-Debye domain wall response in
Fachbereich Physik, Martin-Luther-Universität Halle
F.-Bach-Platz 6, D-06108 Halle, Germany
2 Institut für Experimentalphysik, Universität Wien Strudlhofgasse 4, A-1090 Wien, Austria
Accepted: 8 October 2001
Data obtained by dielectric spectroscopy reveal a strongly polydispersive, non-Debye dispersion appearing in potassium dihydrogen phosphate on cooling below the paraelectric-ferroelectric phase transition temperature . Characterized by a nearly frequency-independent dielectric loss and a real part of the permittivity decreasing in an almost linear way with frequency on a logarithmic scale, the corresponding relaxation mechanism is discussed in terms of dielectric contributions of elastic domain walls weakly pinned on quenched disorder.
PACS: 77.22.Gm – Dielectric loss and relaxation / 77.80.Dj – Domain structure; hysteresis / 77.84.Fa – KDP- and TGS-type crystals
© EDP Sciences, 2002