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Unraveling the natu...
Unraveling the nature of ferrimagnetism and associated exchange interactions in distorted honeycomb Ni4Nb2O9
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- Thota, S. (författare)
- Indian Inst Technol, Dept Phys, Gauhati 781039, Assam, India.
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- Seehra, M. S. (författare)
- West Virginia Univ, Dept Phys & Astron, Morgantown, WV 26506 USA.
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- Chowdhury, M. R. (författare)
- Indian Inst Technol, Dept Phys, Gauhati 781039, Assam, India.
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- Singh, H. (författare)
- Indian Inst Technol, Dept Phys, Gauhati 781039, Assam, India.
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- Ghosh, S. (författare)
- Indian Inst Technol, Dept Phys, Gauhati 781039, Assam, India.
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- Jena, S. K. (författare)
- Indian Inst Technol, Dept Phys, Gauhati 781039, Assam, India.
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- Pramanik, Pratyusha (författare)
- Uppsala universitet,Institutionen för materialvetenskap
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- Sarkar, Tapati (författare)
- Uppsala universitet,Fasta tillståndets fysik
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- Rawat, R. S. (författare)
- Nanyang Technol Univ, Natl Inst Educ, Singapore 637616, Singapore.
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- Medwal, R. (författare)
- Nanyang Technol Univ, Natl Inst Educ, Singapore 637616, Singapore.
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- Weise, B. (författare)
- Leibniz IFW Dresden, Inst Complex Mat, D-01069 Dresden, Germany.
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Indian Inst Technol, Dept Phys, Gauhati 781039, Assam, India West Virginia Univ, Dept Phys & Astron, Morgantown, WV 26506 USA. (creator_code:org_t)
- American Physical Society, 2022
- 2022
- Engelska.
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Ingår i: Physical Review B. - : American Physical Society. - 2469-9950 .- 2469-9969. ; 106:13
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
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- Ferrimagnetism in orthorhombic Ni4Nb2O9 below its Neel temperature, T-FN similar to 76K is reported to result from two inequivalent Ni2+ ions having different magnetic moments. However, a clear understanding of the temperature variation of its magnetization [M(T)] for T > T-FN and T < T-FN in terms of a single set of exchange parameters is still lacking. In this work, experimental results obtained from a detailed analysis of the temperature and magnetic field dependence of magnetization [M(T, H)], ac-magnetic susceptibility [chi(ac)( f, T, H)], and heat-capacity [C-P(T, H)] measurements are combined with theoretical analysis to provide new insights into the nature of ferrimagnetism in Ni4Nb2O9. X-ray diffraction/Rietveld analysis of the prepared sample yielded the structural parameters of the orthorhombic crystal in agreement with previous studies, whereas x-ray photoelectron spectroscopy confirmed the Ni2+ and Nb5+ electronic states in Ni4Nb2O9. Analysis of chi(ac)(T) shows the paramagnetic-to-ferrimagnetic transition occurs at 76.5 K (T-FN), which increases with applied field H as T-FN proportional to H-0.35 due to the coupling of the ferromagnetic component with H. For T > T-FN, the chi(dc) versus T data are fitted to the Neel's expression for ferrimagnets, yielding the g-factors for the two Ni2+ ions as g(A) = 2.47 and g(B) = 2.10. Also, the antiferromagnetic molecular field constants between the A and B sublattices were evaluated as N-AA = 26.31, N-BB = 8.59, and N-AB = 43.06, which, in turn, yield the antiferromagnetic exchange parameters: J(AA)/k(B) = 4.27 K, J(BB)/k(B) = 1.40 K, and J(AB)/k(B) = 6.98 K. For T < T-FN, the M versus T data clearly show the magnetic compensation point at T-COM similar to 33 K. The mathematical model presented here using the magnitudes of NAA, NBB, and NAB correctly predicts the position of T-COM as well the temperature variation of M both above and below T-COM. The data of C-P(T) versus T shows a lambda-type anomaly across T-FN. After subtracting the lattice contribution, the C-P(T) data are fitted to C-P = A(T - T-N)((-alpha)) yielding the critical exponent alpha = 0.14(0.12) for T < T-FN (T > T-FN), which is a characteristic of second-order phase transition. Magnetic entropy changes determined from the M-H isotherms shows that the applied field H enhances the magnetic ordering for T > T-FN and T < T-COM, but for T-COM < T < T-FN, the spin disorder increases with the increase in H. The temperature variation of the measured coercivity H-C(T) and remanence M-R(T) from 1.9 K to T-FN initially show a decreasing trend, becoming zero at T-COM, then followed by an increase and eventually becoming zero again at T-FN.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
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Thota, S.
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Seehra, M. S.
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Chowdhury, M. R.
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Singh, H.
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Ghosh, S.
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Jena, S. K.
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Pramanik, Pratyu ...
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Sarkar, Tapati
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Rawat, R. S.
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Medwal, R.
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Weise, B.
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