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Interplay of lattic...
Interplay of lattice-spin-orbital coupling and Jahn-Teller effect in noncollinear spinel Ti x Mn1-x (Fe y Co1-y )2O4 : a neutron diffraction study
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- Pramanik, Prativa (författare)
- Uppsala universitet,Institutionen för materialvetenskap,Indian Inst Technol Guwahati, Dept Phys, Gauhati 781039, Assam, India.
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- Singha, A. D. (författare)
- Indian Inst Technol Guwahati, Dept Phys, Gauhati 781039, Assam, India.
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- Reehuis, M. (författare)
- Helmholtz Zentrum Berlin Mat & Energie, D-14109 Berlin, Germany.
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- Pittala, S. (författare)
- Dayananda Sagar Univ, Sch Engn, Dept Phys, Bengaluru 562112, India.
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- Joshi, Deep C. (författare)
- Uppsala universitet,Fasta tillståndets fysik,Indian Inst Technol Guwahati, Dept Phys, Gauhati 781039, Assam, India.
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- Sarkar, Tapati (författare)
- Uppsala universitet,Fasta tillståndets fysik
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- Tovar, M. (författare)
- Helmholtz Zentrum Berlin Mat & Energie, D-14109 Berlin, Germany.
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- Hoser, A. (författare)
- Helmholtz Zentrum Berlin Mat & Energie, D-14109 Berlin, Germany.
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- Hoffmann, J-U (författare)
- Helmholtz Zentrum Berlin Mat & Energie, D-14109 Berlin, Germany.
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- Thota, S. (författare)
- Indian Inst Technol Guwahati, Dept Phys, Gauhati 781039, Assam, India.
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(creator_code:org_t)
- Institute of Physics (IOP), 2024
- 2024
- Engelska.
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Ingår i: Journal of Physics. - : Institute of Physics (IOP). - 0953-8984 .- 1361-648X. ; 36:35
- Relaterad länk:
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http://epc.ub.uu.se/...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Local magnetostructural changes and dynamical spin fluctuations in doubly diluted spinel TixMn1-x(FeyCo1-y)(2)O-4 has been reported by means of neutron diffraction and magnetization studies. Two distinct sets of compositions (i) x(Ti) = 0.20 and y(Fe) = 0.18; (ii) x(Ti) = 0.40 and y(Fe) = 0.435 have been considered for this study. The first compound of equivalent stoichiometry Ti0.20Mn0.80Fe0.36Co1.64O4 exhibits enhanced tetragonal distortion across the ferrimagnetic transition temperature T-C = 258 K in comparison to the end compound MnCo2O4 (T-C similar to 180 K) with a characteristic ratio c(t)/root 2a(t) of 0.99795(8) demonstrating robust lattice-spin-orbital coupling. However, in the second case Ti0.40Mn0.60Fe0.87Co1.13O4 with higher B-site compositions, the presence of Jahn-Teller ions with distinct behavior appears to counterbalance the strong tetragonal distortion thereby ceasing the lattice-spin-orbital coupling. Both the investigated systems show the coexistence of noncollinear antiferromagnetic and ferrimagnetic components in cubic and tetragonal settings. On the other hand, the dynamical ac-susceptibility, chi(ac)(T) reveals a cluster spin-glass state with Gabay-Toulouse (GT) like mixed phases behaviour below T-C. Such dispersive behaviour appears to be sensitive to the level of octahedral substitution. Further, the field dependence of chi(ac)(T) follows the weak anisotropic GT-line behaviour with crossover exponent Phi lies in the range 1.38-1.52 on the H-T plane which is in contrast to the B-site Ti substituted MnCo2O4 spinel that appears to follow irreversible non-mean-field AT-line behaviour (Phi similar to 3 + delta). Finally, the Arrott plots analysis indicates the presence of a pseudo first-order like transition (T < 20 K) which is in consonance with and zero crossover of the magnetic entropy change within the frozen spin-glass regime.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Nyckelord
- Jahn-Teller effect
- neutron diffraction
- noncollinear antiferromagnetism
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Pramanik, Prativ ...
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Singha, A. D.
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Reehuis, M.
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Pittala, S.
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Joshi, Deep C.
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Sarkar, Tapati
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Tovar, M.
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Hoser, A.
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Hoffmann, J-U
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Thota, S.
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