Effects of Non-Stoichiometry on the Ground State of the Frustrated System Li0.8Ni0.6Sb0.4O2

The non-stoichiometric system Li0.8Ni0.6Sb0.4O2 is a Li-deficient derivative of the zigzag honeycomb antiferromagnet Li3Ni2SbO6. Structural...

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Autores principales:	Evgeniya Vavilova, Timur Salikhov, Margarita Iakovleva, Tatyana Vasilchikova, Elena Zvereva, Igor Shukaev, Vladimir Nalbandyan, Alexander Vasiliev
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	honeycomb lattice magnetic frustration metal oxides Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/ddab78965ce7453e8723fbd2fa956373
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spelling	oai:doaj.org-article:ddab78965ce7453e8723fbd2fa9563732021-11-25T18:13:32ZEffects of Non-Stoichiometry on the Ground State of the Frustrated System Li<sub>0.8</sub>Ni<sub>0.6</sub>Sb<sub>0.4</sub>O<sub>2</sub>10.3390/ma142267851996-1944https://doaj.org/article/ddab78965ce7453e8723fbd2fa9563732021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/22/6785https://doaj.org/toc/1996-1944The non-stoichiometric system Li<sub>0.8</sub>Ni<sub>0.6</sub>Sb<sub>0.4</sub>O<sub>2</sub> is a Li-deficient derivative of the zigzag honeycomb antiferromagnet Li<sub>3</sub>Ni<sub>2</sub>SbO<sub>6</sub>. Structural and magnetic properties of Li<sub>0.8</sub>Ni<sub>0.6</sub>Sb<sub>0.4</sub>O<sub>2</sub> were studied by means of X-ray diffraction, magnetic susceptibility, specific heat, and nuclear magnetic resonance measurements. Powder X-ray diffraction data shows the formation of a new phase, which is Sb-enriched and Li-deficient with respect to the structurally honeycomb-ordered Li<sub>3</sub>Ni<sub>2</sub>SbO<sub>6</sub>. This structural modification manifests in a drastic change of the magnetic properties in comparison to the stoichiometric partner. Bulk static (dc) magnetic susceptibility measurements show an overall antiferromagnetic interaction (<i>Θ</i> = −4 K) between Ni<sup>2+</sup> spins (<i>S</i> = 1), while dynamic (ac) susceptibility reveals a transition into a spin glass state at a freezing temperature <i>T</i><sub>SG</sub> ~ 8 K. These results were supported by the absence of the λ-anomaly in the specific heat <i>C</i><sub>p</sub>(T) down to 2 K. Moreover, combination of the bulk static susceptibility, heat capacity and <sup>7</sup>Li NMR studies indicates a complicated temperature transformation of the magnetic system. We observe a development of a cluster spin glass, where the Ising-like Ni<sup>2+</sup> magnetic moments demonstrate a 2D correlated slow short-range dynamics already at 12 K, whereas the formation of 3D short range static ordered clusters occurs far below the spin-glass freezing temperature at T ~ 4 K as it can be seen from the <sup>7</sup>Li NMR spectrum.Evgeniya VavilovaTimur SalikhovMargarita IakovlevaTatyana VasilchikovaElena ZverevaIgor ShukaevVladimir NalbandyanAlexander VasilievMDPI AGarticlehoneycomb latticemagnetic frustrationmetal oxidesTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6785, p 6785 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	honeycomb lattice magnetic frustration metal oxides Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	honeycomb lattice magnetic frustration metal oxides Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Evgeniya Vavilova Timur Salikhov Margarita Iakovleva Tatyana Vasilchikova Elena Zvereva Igor Shukaev Vladimir Nalbandyan Alexander Vasiliev Effects of Non-Stoichiometry on the Ground State of the Frustrated System Li<sub>0.8</sub>Ni<sub>0.6</sub>Sb<sub>0.4</sub>O<sub>2</sub>
description	The non-stoichiometric system Li<sub>0.8</sub>Ni<sub>0.6</sub>Sb<sub>0.4</sub>O<sub>2</sub> is a Li-deficient derivative of the zigzag honeycomb antiferromagnet Li<sub>3</sub>Ni<sub>2</sub>SbO<sub>6</sub>. Structural and magnetic properties of Li<sub>0.8</sub>Ni<sub>0.6</sub>Sb<sub>0.4</sub>O<sub>2</sub> were studied by means of X-ray diffraction, magnetic susceptibility, specific heat, and nuclear magnetic resonance measurements. Powder X-ray diffraction data shows the formation of a new phase, which is Sb-enriched and Li-deficient with respect to the structurally honeycomb-ordered Li<sub>3</sub>Ni<sub>2</sub>SbO<sub>6</sub>. This structural modification manifests in a drastic change of the magnetic properties in comparison to the stoichiometric partner. Bulk static (dc) magnetic susceptibility measurements show an overall antiferromagnetic interaction (<i>Θ</i> = −4 K) between Ni<sup>2+</sup> spins (<i>S</i> = 1), while dynamic (ac) susceptibility reveals a transition into a spin glass state at a freezing temperature <i>T</i><sub>SG</sub> ~ 8 K. These results were supported by the absence of the λ-anomaly in the specific heat <i>C</i><sub>p</sub>(T) down to 2 K. Moreover, combination of the bulk static susceptibility, heat capacity and <sup>7</sup>Li NMR studies indicates a complicated temperature transformation of the magnetic system. We observe a development of a cluster spin glass, where the Ising-like Ni<sup>2+</sup> magnetic moments demonstrate a 2D correlated slow short-range dynamics already at 12 K, whereas the formation of 3D short range static ordered clusters occurs far below the spin-glass freezing temperature at T ~ 4 K as it can be seen from the <sup>7</sup>Li NMR spectrum.
format	article
author	Evgeniya Vavilova Timur Salikhov Margarita Iakovleva Tatyana Vasilchikova Elena Zvereva Igor Shukaev Vladimir Nalbandyan Alexander Vasiliev
author_facet	Evgeniya Vavilova Timur Salikhov Margarita Iakovleva Tatyana Vasilchikova Elena Zvereva Igor Shukaev Vladimir Nalbandyan Alexander Vasiliev
author_sort	Evgeniya Vavilova
title	Effects of Non-Stoichiometry on the Ground State of the Frustrated System Li<sub>0.8</sub>Ni<sub>0.6</sub>Sb<sub>0.4</sub>O<sub>2</sub>
title_short	Effects of Non-Stoichiometry on the Ground State of the Frustrated System Li<sub>0.8</sub>Ni<sub>0.6</sub>Sb<sub>0.4</sub>O<sub>2</sub>
title_full	Effects of Non-Stoichiometry on the Ground State of the Frustrated System Li<sub>0.8</sub>Ni<sub>0.6</sub>Sb<sub>0.4</sub>O<sub>2</sub>
title_fullStr	Effects of Non-Stoichiometry on the Ground State of the Frustrated System Li<sub>0.8</sub>Ni<sub>0.6</sub>Sb<sub>0.4</sub>O<sub>2</sub>
title_full_unstemmed	Effects of Non-Stoichiometry on the Ground State of the Frustrated System Li<sub>0.8</sub>Ni<sub>0.6</sub>Sb<sub>0.4</sub>O<sub>2</sub>
title_sort	effects of non-stoichiometry on the ground state of the frustrated system li<sub>0.8</sub>ni<sub>0.6</sub>sb<sub>0.4</sub>o<sub>2</sub>
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/ddab78965ce7453e8723fbd2fa956373
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Effects of Non-Stoichiometry on the Ground State of the Frustrated System Li<sub>0.8</sub>Ni<sub>0.6</sub>Sb<sub>0.4</sub>O<sub>2</sub>

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