LAUSR

Abstract We have investigated magnetic and ferroelectric (dielectric) properties of multiferroic CuFe0.982Ga0.018O2, CuFe0.965Ga0.035O2 and CuFe0.95Al0.05O2 under applied uniaxial pressure p up to 600 MPa. Unlike the results of the almost same experiments on CuFeO2 [Tamatsukuri et al. Phys. Rev. B 94 174402 (2016)], we have found that the application of p induces a new ferroelectric phase, which is different from the well-studied spin-driven ferroelectric phase with helical magnetic ordering, in all the doped samples investigated here. We have also constructed the temperature versus p magnetoelectric phase diagrams of the three samples. The ferroelectric polarization in the p-induced ferroelectric phase lies along the [110] direction as in the helical magneto-ferroelectric phase, and its value is comparable with or larger than that in the helical magneto-ferroelectric phase. The magnetic structure in the p-induced ferroelectric phase seems to be of a collinear sinusoidal type. Although this magnetic structure itself does not break the inversion symmetry, it is considered to play an important role in the origin of ferroelectricity in the p-induced ferroelectric phase through the spin-lattice coupling in this system.