Evolution of magnetic and dielectric properties in Sr-substituted high temperature multiferroic YBaCuFeO5

Abstract

We report the evolution of structural, magnetic and dielectric properties due to partial substitution of Ba by Sr in the high temperature multiferroic YBaCuFeO5. This compound exhibits ferroelectric and antiferromagnetic transitions around 200 K and these two phenomena are presumed to be coupled with each other. Our studies on magnetic and dielectric properties of the YBa1-xSrxCuFeO5 (x = 0.0, 0.25 and 0.5) show that substitution of Sr shifts magnetic transition towards higher temperature whereas dielectric transition to lower temperature. These results points to the fact that magnetic and dielectric transitions get decoupled as a result of chemical pressure in form of Sr substitution. The nature of magnetodielectric coupling changes across the series with the presence of higher order coupling terms. Additionally in these compounds glassy dynamics of electric dipoles is observed at low temperatures.

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Cited by in corpus (7)

• Design of magnetic spirals in layered perovskites: extending the stability range far beyond room temperature
• Tuning the tilting of the spiral plane by Mn doping in YBaCuFeO5 multiferroic
• Nature of the spiral state, electric polarisation and magnetic transitions in Sr-doped YBaCuFeO${}_5$: A first-principles study
• Effect of (Cu/Fe)O5 bipyramid size and separation on magnetic and dielectric properties of rare earth layered perovskite LaBaCuFeO5 and LuBaCuFeO5
• Effect of doping of Co, Ni and Ga on magnetic and dielectric properties of layered perovskite multiferroic YBaCuFeO5
• Low temperature magnetic and dielectric properties of LnBaCuFeO5 (Ln = Nd, Eu, Gd, Ho and Yb)
• Orbitally driven spin reorientation in Mn doped YBaCuFeO${}_5$