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We have carried out dc magnetization (M), heat-capacity (C) and dielectricstudies down to 2K for the compound GdCrTiO5, crystallizing in orthorhombicPbam structure, in which well-known multiferroics RMn2O5 (R= Rare-earths) form.The points of emphasis are: (i) The magnetic ordering temperature of Cr appearsto be suppressed compared to that in isostructural Nd counterpart, NdCrTiO5,for which the Neel temperature is about 21 K. This finding on the Gd compoundsuggests that Nd 4f orbital plays a role on the magnetism of Cr in contrast toa proposal long ago. (ii) Dielectric constant does not exhibit any notablefeature below about 30 K in the absence of external magnetic field, but a peakappears and gets stronger with the application of external magnetic fields,supporting the existence of magnetodielectric coupling. (iii) The dielectricanomalies appear even near 100 K, which can be attributed to short-rangemagnetic-order. We also observe a gain in spectral weight below about 150 K inRaman spectra in the frequency range 150 to 400 cm-1, which could be magneticin origin supporting short-range magnetic order. It is of interest to explorewhether geometrically frustration plays any role on the dielectric propertiesof this family, as in the case of RMn2O5.

Implications of magnetic and magnetodielectric behavior of GdCrTiO5