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arXiv · 1410.7210

Multiglass properties and magnetoelectric coupling in uniaxial anisotropic spin-cluster-glass Fe2TiO5

Shivani Sharma·Tathamay Basu·Aga Shahee·K. Singh·N. P. Lalla·E. V. Sampathkumaran
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Abstract

The compound, Fe2TiO5 (FTO)is a well-known uniaxial anisotropic spin-glass insulator with two successive glassy freezing temperatures i.e. transverse (TTF= 9K) and longitudinal (TLF= 55 K). In this article, we present the results of measurements of complex dielectric behavior, electric polarization as a function of temperature (T), 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 T regime T TTF.The data in addition provide evidence for the glassy dynamics of electric-dipoles; interestingly, this occurs at much higher temperature (~100-150 K) than TLF with high remnant polarization at 10 K( 4000 micro C/m2) attributable to short-range magnetic correlations, thereby offering a route to attain ME coupling above 77 K.

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Shivani Sharma, Tathamay Basu, Aga Shahee, K. Singh, N. P. Lalla, E. V. Sampathkumaran. 2014-10-27. Multiglass properties and magnetoelectric coupling in uniaxial anisotropic spin-cluster-glass Fe2TiO5. https://doi.org/10.1103/physrevb.90.144426

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