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Cationic distributi...
Cationic distribution, exchange interactions, and relaxation dynamics in Zn-diluted MnCo2O4 nanostructures
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- Pramanik, P. (author)
- Indian Inst Technol, Dept Phys, Gauhati 781039, Assam, India
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- Joshi, D. C. (author)
- Indian Inst Technol, Dept Phys, Gauhati 781039, Assam, India
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- Tiwari, N. (author)
- Nanyang Technol Univ, Energy Res Inst, Singapore, Singapore
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- Sarkar, Tapati (author)
- Uppsala universitet,Fasta tillståndets fysik
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- Pittala, S. (author)
- Indian Inst Sci, Dept Phys, Bangalore 560012, Karnataka, India
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- Salman, O. O. (author)
- IFW Dresden, Inst Complex Mat, Helmholtzstr 20, D-01069 Dresden, Germany
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Manga, M-M (author)
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- Thota, S. (author)
- Indian Inst Technol, Dept Phys, Gauhati 781039, Assam, India
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(creator_code:org_t)
- AMER INST PHYSICS, 2019
- 2019
- English.
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In: Journal of Applied Physics. - : AMER INST PHYSICS. - 0021-8979 .- 1089-7550. ; 125:12
- Related links:
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https://dr.ntu.edu.s...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
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- 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 (Co1-yA2+ZnyA2+)(A)[Mn3+Co3+](B)O-4 +/-delta, whereas B-site dilution results in (Co2+)(A)[Mn1-xB3+ZnxB2+Co3+](B)O4-delta. The strength of exchange interaction J(ij) between the magnetic ions in a bulk spinel lattice decreases by similar to 15% for A-site dilution relative to the undiluted compound; however, B-site dilution results in an enhancement in J(ij) by 17%. The frequency and temperature dependence of dynamic-susceptibility [chi(ac)(f, T)] studies of nanostructured compounds reveals the existence of spin-glass like behavior below the freezing temperature T-F similar to 125.7 K (for x(B) = 0.2) and 154.3 K (y(A) = 0.1). Relaxation time tau follows the Power-Law variation with a dynamical critical exponent zv = 6.17 and microscopic spin relaxation time tau(o) = 4.4 x 10(-15) s for x(B) = 0.2 (for y(A) = 0.1, zv = 5.2 and tau(o) = 5.4 x 10(-13) s). The amplitude and peak position in chi(ac)(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 T-F in these Zn diluted spinels.
Subject headings
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
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