Browsing by Author "J. Saha"
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PublicationArticle Effect of dilution of both A-and B-sites on the multiferroic properties of spinal Mott insulators(Institute of Physics Publishing, 2015) Prashant Shahi; Rahul K. Singh; Rajesh K. Singh; Shiv Kumar; A. Tiwari; A. Tripathi; J. Saha; S. Patnaik; A.K. Ghosh; Sandip ChatterjeeThe structural, magnetic, electrical and transport properties of FeV2O4, by doping Li and Cr ions in A and B sites, respectively, have been studied. Dilution of the A site by Li doping decreases the V-V distances which in effect increases the A-V coupling. This increased coupling enhances the ferrimagnetic ordering temperature and reduces the ferroelectric transition temperature. Furthermore, since Li is non-magnetic the A-V coupling is also decreased. The increase in A-V coupling dominates over the decrease in A-V coupling with Li doping. On the other hand, Cr doping increases the ferrimagnetic ordering temperature but does not alter the ferroelectric transition temperature, which is due to the fact that the polarization originates from the presence of almost non-substituted regions. © 2015 IOP Publishing Ltd.PublicationArticle Hidden transition in multiferroic and magnetodielectric CuCrO2 evidenced by ac-susceptibility(Institute of Physics Publishing, 2017) Kaushak K. Shukla; Arkadeb Pal; Abhishek Singh; Rahul Singh; J. Saha; A.K. Sinha; A.K. Ghosh; S. Patnaik; A.M. Awasthi; Sandip ChatterjeeFerroelectric polarization, magnetic-field dependence of the dielectric constant and ac and dc magnetizations of frustrated CuCrO2 have been measured. A new spin freezing transition below 32 K is observed which is thermally driven. The nature of the spin freezing is to be a single-ion process. Dilution by the replacements of Cr ions by magnetic Mn ions showed suppression of the spin freezing transition suggesting it to be fundamentally a single-ion freezing process. The observed freezing, which is seemingly associated to geometrical spin frustration, represents a novel form of magnetic glassy behavior. © CopyrightEPLA, 2017.