Order-parameter coupling in the improper ferroelectric lawsonite
作者： E K H Salje , K Gofryk , D J Safarik , J C Lashley
DOI: 10.1088/0953-8984/24/25/255901
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摘要: Low-temperature specific heat and thermal expansion measurements are used to study the hydrogen-based ferroelectric lawsonite over temperature range 1.8 K ≤ T 300 K. The second-order phase transition near 125 is detected in experiments, low-temperature determined be improper co-elastic. In K, spontaneous polarization Ps proportional (1) volume strain es, (2) excess entropy ΔSe. These proportionalities confirm character of transition. We develop a structural model that allows off-centering hydrogen positions generate polarization. limit we detect Schottky anomaly (two-level system) with an energy gap Δ ~ 0.5 meV.
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