Ferrielectricity in a metal-organic ferroelectric tris-sarcosine calcium chloride
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We report a paradigm of ferrielectricity in a single-phase crystal, tris-sarcosine calcium chloride [TSCC; (CH3NHCH2COOH)3CaCl2]. Ferrielectricity is well known in smectic liquid crystals but almost unknown in true crystalline solids. C. F. Pulvari [Ferrielectricity, Phys. Rev. 120 , 1670 (1960)] reported it in 1960 in mixtures of ferroelectrics and antiferroelectrics (AFEs), but only at high fields. Tris-sarcosine calcium chloride exhibits a second-order displacive phase transition near Tc=130K that can be lowered to a quantum critical point at 0 K via Br or I substitution and phases previously predicted to be AFE at high pressure and low temperatures. Unusually, the size of the primitive unit cell does not increase in the so-called AFE phase. We measure hysteresis loops and polarization below T=64K and provide clear Raman evidence for this paraelectric-ferrielectric transition.
Scott , J F , Morrison , F D , Slawin , A M Z , Clulow , R , Gherson , A , Bumstead , A , Gardner , J , Capelli , S , Probert , M , Sahoo , S , Young , J , Katiyar , R & Salje , E 2017 , ' Ferrielectricity in a metal-organic ferroelectric tris-sarcosine calcium chloride ' , Physical Review. B, Condensed matter and materials physics , vol. 95 , no. 9 , 094119 . https://doi.org/10.1103/PhysRevB.95.094119
Physical Review. B, Condensed matter and materials physics
© 2017, American Physical Society. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at journals.aps.org/prb / https://doi.org/10.1103/PhysRevB.95.094119
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