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Title: Cationic distribution, exchange interactions, and relaxation dynamics in Zn-diluted MnCo2O4 nanostructures
Authors: Tiwari, Nidhi
Pramanik, P.
Joshi, D. C.
Sarkar, T.
Pittala, S.
Salman, O. O.
Manga, M.-M.
Thota, S.
Keywords: Cationic Distribution
Exchange Interactions
Issue Date: 2019
Source: Pramanik, 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:10.1063/1.5079800
Series/Report no.: Journal of Applied Physics
Abstract: We 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.
ISSN: 0021-8979
DOI: 10.1063/1.5079800
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).
Fulltext Permission: open
Fulltext Availability: With Fulltext
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