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Hreniak D.,Polish Academy of Sciences | Marciniak L.,Polish Academy of Sciences | Strek W.,Polish Academy of Sciences | Piccinelli F.,Laboratorio Of Chimica Dello Stato Solido Db | And 2 more authors.
Physical Review B - Condensed Matter and Materials Physics

In a recent paper, Mukherjee reported a colossal enhancement of dielectric constant along with magnetodielectric (MD) behavior in a SiO2-Er 2O3 system synthesized via the sol-gel route. In the opinion of the authors of the criticized paper, such a colossal MD effect in the measured samples is a direct consequence of exploiting magnetoresistance changes associated with the size and concentration of Er2O 3 nanoparticles. We point out that the disappearing MD behavior depends on the crystallite size and dopant concentration, as shown by the authors of the criticized paper, but also on the nature and the crystal structure of the compound. © 2011 American Physical Society. Source

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