Figure 1: Evolution of electric and magnetic phases of TbMnO3 by applying pressure.
From: Giant spin-driven ferroelectric polarization in TbMnO3 under high pressure
(a,b) Cycloidal spiral (a) and E-AFM (b) structures observed in orthorhombically distorted perovskite manganites. The upper and lower panels show views along the c and the a axes, respectively. Orange arrows denote directions of atomic displacements due to the symmetric exchange striction at the respective oxygen sites. (c–e) Temperature profiles of heat capacity Cac (c) and relative dielectric constant (εc (d) and εa (e)) scaled by the value of 60 K at several pressures. The respective data are vertically offset for clear comparison. The dielectric constant was measured at a.c. electric fields with 10 kHz. (f) Proposed temperature versus pressure phase diagram. The phase boundaries are determined by the T profiles of Cac (circles), εc (diamonds) and εa (squares) at the respective pressures. Open and closed symbols denote the data points taken on cooling and heating runs, respectively.
