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dc.contributor.authorTiwari, Nidhien
dc.contributor.authorPramanik, P.en
dc.contributor.authorJoshi, D. C.en
dc.contributor.authorSarkar, T.en
dc.contributor.authorPittala, S.en
dc.contributor.authorSalman, O. O.en
dc.contributor.authorManga, M.-M.en
dc.contributor.authorThota, S.en
dc.identifier.citationPramanik, P., Joshi, D. C., Tiwari, N., Sarkar, T., Pittala, S., Salman, O. O., . . . Thota, S. (2019). Cationic distribution, exchange interactions, and relaxation dynamics in Zn-diluted MnCo2O4 nanostructures. Journal of Applied Physics, 125(12), 124302-. doi:10.1063/1.5079800en
dc.description.abstractWe report an experimental investigation of the electronic structure and magnetic properties of bulk and nanosized MnCo2O4 diluted with Zn. The cationic distribution for tetrahedral A-site dilution is (Co2+1−yAZn2+yA)A[Mn3+Co3+]BO4±δ, whereas B-site dilution results in (Co2+)A[Mn3+1−xBZn2+xBCo3+]BO4−δ. The strength of exchange interaction Jij between the magnetic ions in a bulk spinel lattice decreases by ∼15% for A-site dilution relative to the undiluted compound; however, B-site dilution results in an enhancement in Jij by 17%. The frequency and temperature dependence of dynamic-susceptibility [χac(f,T)] studies of nanostructured compounds reveals the existence of spin-glass like behavior below the freezing temperature TF∼125.7K (for xB=0.2) and 154.3 K (yA=0.1). Relaxation time τ follows the Power-Law variation with a dynamical critical exponent zν=6.17 and microscopic spin relaxation time τo=4.4×10−15s for xB=0.2 (for yA=0.1, zν=5.2 and τo=5.4×10−13s). The amplitude and peak position in χac(T) decreases with an increase in the DC bias field, which indicates that the spin-glass phase can survive in the presence of low fields forming a critical line with an exponent 2/3. This behavior is similar to the de Almeida-Thouless (AT-line) analysis in the T-H phase diagram which supports the existence of spin-glass like behavior below TF in these Zn diluted spinels.en
dc.format.extent11 p.en
dc.relation.ispartofseriesJournal of Applied Physicsen
dc.rights© 2019 The Author(s). All rights reserved. This paper was published by AIP in Journal of Applied Physics and is made available with permission of The Author(s).en
dc.subjectCationic Distributionen
dc.subjectExchange Interactionsen
dc.titleCationic distribution, exchange interactions, and relaxation dynamics in Zn-diluted MnCo2O4 nanostructuresen
dc.typeJournal Articleen
dc.contributor.researchEnergy Research Institute @NTUen
dc.description.versionPublished versionen
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