Non-Debye domain wall response in $\chem{KH_2PO_4}

• Published in: Europhysics letters Vol. 57; no. 1; pp. 107 - 112
• Main Authors: Mueller, V., Shchur, Y., Beige, H., Fuith, A., Stepanow, S.
• Format: Journal Article
• Language: English
• Published: EDP Sciences 01.01.2002
• Subjects: 77.22.Gm; 77.80.Dj; 77.84.Fa
• ISSN: 0295-5075; 1286-4854
• DOI: 10.1209/epl/i2002-00548-y

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 $T_\ab{c}$. 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.