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Journal of Physical Studies 7(1), 106–113 (2003)
DOI: https://doi.org/10.30970/jps.07.106 INFLUENCE OF THE SHEAR STRESS σ4 ON THE PHYSICAL PROPERTIES OF ROCHELLE SALTR. R. Levitskii1, I. R. Zachek2, A. P. Moina1, T. M. Verkholyak1
1Institute for Condensed Matter Physics of the National
Acad. Sci. of Ukraine, |
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We study the influence of shear stress $σ_4$ on the phase transitions, static and dynamic dielectric, piezoelectric, elastic, and thermal characteristics of Rochelle salt crystal. The stress effects are visible in the ferroelectric phase and in some temperature range below $T_{\rm C1}$ and above $T_{\rm C2}$. The stress smears out the two second order phase transitions in Rochelle salt and smoothens the peculiarities in temperature curves of the second derivatives of thermodynamic potential $χ^σ_{11}$, $χ^ε_{11}$, $d_{14}$, $e_{14}$, $c_{44}^E$ and $s_{44}^E$, as well as $ε_{11}^*$. Stress effects on these quantities are more essential near the upper Curie point. The characteristics that only exhibit bends at the transition points ($c_{44}^P$, $h_{14}$, $g_{14}$) are not affected by $σ_4$. Stress dependence of the magnitude of the specific heat peaks at the `transition points' is not monotonic and more pronounced near the lower `Curie point'.
PACS number(s): 77.22.Ch, 77.22.Gm, 77.65.Bn, 77.65.Ly, 77.80.Bh