Lookup NU author(s): Dr Mike Probert
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© 2017 American Physical Society. 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)10.1103/PhysRev.120.1670] 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.
Author(s): Scott JF, Morrison FD, Slawin AMZ, Lightfoot P, Clulow R, Gherson ASA, Bumstead AM, Gardner J, Capelli SC, Probert MR, Sahoo S, Young JS, Katiyar RS, Salje EKH
Publication type: Article
Publication status: Published
Journal: Physical Review B - Condensed Matter and Materials Physics
Online publication date: 28/03/2017
Acceptance date: 24/01/2017
ISSN (print): 1098-0121
ISSN (electronic): 1550-235X
Publisher: American Physical Society
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