Dielectric-constant logarithmic correction in RbH 2 PO 4 </mml:math…
1985; American Physical Society; Volume: 32; Issue: 1 Linguagem: Inglês
10.1103/physrevb.32.400
ISSN1095-3795
AutoresJ. L. Martı́nez, Julio A. Gonzalo,
Tópico(s)Acoustic Wave Resonator Technologies
ResumoDielectric-constant measurements in rubidium dihydrogen phosphate at frequencies from 20 Hz to 10 kHz, within an interval of about \ifmmode\pm\else\textpm\fi{}30 K from the Curie point, have been performed with a digital universal bridge. The relative accuracy of capacitance readings was better than 0.1%. Asymptotically close to ${T}_{c}$=145.90\ifmmode\pm\else\textpm\fi{}0.02 K and within an interval of 20 K above ${T}_{c}$, the data appear to follow reasonably well a Curie-Weiss law with logarithmic corrections, first predicted by Larkin and Khmel'nitskii for uniaxial ferroelectrics, and then change over gradually to normal Curie-Weiss behavior.
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