Tathamay Basu

Displacive-type ferroelectricity from magnetic correlations within spin-chain

Observation of ferroelectricity among non-d0 systems, which was believed for a long time an unrealistic concept, led to various proposals for the mechanisms to explain the same (i.e. magnetically induced ferroelectricity) during last decade. Here, we provide support for ferroelectricity of a displacive-type possibly involving magnetic ions due to short-range magnetic correlations within a spin-chain, through the demonstration of magnetoelectric coupling in a Haldane spin-chain compound Er2BaNiO5 well above its Néel temperature of (TN = ) 32 K. There is a distinct evidence for electric polarization setting in near 60 K around which there is an evidence for short-range magnetic correlations from other experimental methods. Raman studies also establish a softening of phonon modes in the same temperature (T) range and T-dependent x-ray diffraction (XRD) patterns also reveal lattice parameters anomalies. Density-functional theory based calculations establish a displacive component (similar to d0-ness) as the root-cause of ferroelectricity from (magnetic) NiO6 chain, thereby offering a new route to search for similar materials near room temperature to enable applications.

Multiglass properties and magnetoelectric coupling in the uniaxial anisotropic spin-cluster-glass Fe 2 Ti O 5

The compound

Anisotropic magnetodielectric coupling behavior of Ca3Co1.4Rh0.6O6 due to geometrically frustrated magnetism

{\mathrm{Fe}}_{2}\mathrm{Ti}{\mathrm{O}}_{5}

Implications of magnetic and magnetodielectric behavior of GdCrTiO5

(FTO) is a well-known uniaxial anisotropic spin-glass insulator with two successive glassy freezing temperatures, i.e., transverse

Multiferroicity and magneto-electric effect in Gd2BaNiO5

({T}_{TF}=9\phantom{\rule{0.16em}{0ex}}\mathrm{K})

Effect of rare-earth (Er and Gd) substitution on the magnetic and multiferroic properties of DyFe0.5Cr0.5O3.

and longitudinal

Magnetic and dielectric behavior of the spin-chain compound Er2BaNiO5 well below its Néel temperature

({T}_{LF}=55\phantom{\rule{0.16em}{0ex}}\mathrm{K})

Magnetic and magnetodielectric coupling anomalies in the Haldane spin-chain system Nd2BaNiO5

. In this article, we present the results of measurements of complex dielectric behavior, electric polarization as a function of temperature

Modifications in the frustrated magnetism, oxidation state of Co and magnetoelectric coupling effects induced by a partial replacement of Ca by Gd in the spin-chain compound Ca3Co2O6

(T)

Magnetodielectric coupling in a non-perovskite metal–organic framework

, in addition to characterization by magnetic susceptibility and heat capacity, primarily to explore magnetoelectric (ME) coupling and multiglass properties in uniaxial anisotropic spin-cluster-glass FTO. The existence of two magnetic transitions is reflected in the isothermal magnetodielectric (MD) behavior in the sense that the sign of MD is different in the