Multiferroicity in a spin-chain compound, Tb2BaCoO5, with exceptionally large magnetodielectric coupling in polycrystalline form

Abstract

We report the results of detailed investigations of magnetization, heat-capacity, dielectric, pyrocurrent, and magneto(di)electric measurements on Tb2BaCoO5, belonging to a hither-to-unexplored spin-chain cobaltates family, R2BaCoO5 (R= Rare-earths). The magnetic measurements reveal that this compound exhibits an antiferromagnetic transition at (T_N=) 18.8 K and there is a spin-reorientation beyond 40 kOe below T_N. Dielectric and pyrocurrent data measured as a function of temperature and magnetic-field establish that this compound is a type-II multiferroic material. The most fascinating finding which we would like to emphasize is that the observed value of the magnetodielectric effect beyond the metamagnetic transition field is the largest (close to 55%, below 10 K, for H= 100 kOe) ever reported for polycrystals of a compound in bulk form, thereby offering a hope to find a single-phase polycrystalline compound at room temperature to enable ease of applications.

arXiv commentApplied Physics Letters, in press

References in corpus (7)

• Magnetic inversion symmetry breaking and ferroelectricity in TbMnO3
• Perovskite Manganites Hosting Versatile Multiferroic Phases with Symmetric and Antisymmetric Exchange Strictions
• Multiferroicity in rare-earth nickelates RNiO3
• Magnetoelectric coupling in Haldane spin chain system, Dy2BaNiO5
• Extraordinarily large intrinsic magnetodielectric coupling of Tb member within the Haldane spin-chain family, R2BaNiO5
• Magnetic and dielectric behavior of the spin-chain compound Er2BaNiO5 well below its Néel temperature
• Multiferroicity and magneto-electric effect in Gd${}_2$BaNiO${}_5$

Cited by in corpus (3)

• High-temperature ferroelectric order and magnetic field-cooled effect driven magnetoelectric coupling in R2BaCuO5 (R= Er, Dy, Sm)
• Field-induced spin reorientation transitions in antiferromagnetic ring-shaped spin chains
• Destruction of multiferroicity in Tb2BaNiO5 by Sr doping and its implication to magnetoelectric coupling