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  Magnetic spin order in the honeycomb structured Pb6Co9(TeO6)5 compound

Muthuselvam, I. P., Saranya, K., Kasinathan, D., Bhowmik, R. N., Sankar, R., Dhenadhayalan, N., et al. (2021). Magnetic spin order in the honeycomb structured Pb6Co9(TeO6)5 compound. Physical Review B, 104(17): 174442, pp. 1-11. doi:10.1103/PhysRevB.104.174442.

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 Creators:
Muthuselvam, I. Panneer1, Author
Saranya, K.1, Author
Kasinathan, Deepa2, Author              
Bhowmik, R. N.1, Author
Sankar, R.1, Author
Dhenadhayalan, Namasivayam1, Author
Shu, G. J.1, Author
Chen, Wei-tin1, Author
Kavitha, L.1, Author
Lin, King-Chuen1, Author
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1External Organizations, ou_persistent22              
2Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              

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 Abstract: We present a comprehensive experimental and theoretical study of the structural, electronic, magnetic, and thermodynamic properties of a Pb6Co9(TeO6)(5) single crystal. The Pb6Co9(TeO6)(5) crystal has shown a unique type of magnetic spin-lattice coupling, in which the lattice structure consists of four different Co ions sites with distorted octahedral coordinations. The x-ray photoelectron spectroscopy (XPS) results confirmed the oxidation states of Pb, Co, Te, and O elements in the sample. Moreover, XPS spectra revealed the adsorbed oxygen in the defect/vacancy sites of the lattice structure. The dc magnetization measurements exhibited a complex magnetic behavior with ferrimagnetic (FIM) transition with Curie temperature T-C at similar to 21 K. At lower magnetic fields H, the zero-field-cooled and field-cooled curves showed a broad hump at similar to 10.8 K and a shoulder peak at similar to 6.2 K, which are suppressed at higher magnetic fields. The ac susceptibility data indicated spin-glass-like features. The heat capacity C-P measurements confirmed the FIM transition at T-C at similar to 21 K, but without any trace of additional peaks at lower temperatures. The estimated Curie-Weiss constant theta(CW) showed a peculiar field-dependent behavior along the H parallel to c direction of the single crystal, where theta(CW) is less field dependent for the H perpendicular to c direction. A large coercivity (13 kOe) is observed at 2 K for H parallel to c, whereas the magnetization curve of the single crystal is dominated by an antiferromagnetic feature for H perpendicular to c. The behaviors indicate the anisotropy nature of the exchange interactions in the compound. The local spin density approximation + U total energy calculations were performed for various collinear spin configurations of a classical Heisenberg model in order to obtain the magnetic exchange interactions J(i) at different distances for different neighbors.

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Language(s): eng - English
 Dates: 2021-11-292021-11-29
 Publication Status: Published in print
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 104 (17) Sequence Number: 174442 Start / End Page: 1 - 11 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008