A. G. Smolnikov, Yu. V. Piskunov, V. V. Ogloblichev, A. F. Sadykov, M. E. Kashnikova, N. A. Utkin, A. P. Gerashchenko, D. F. Akramov, N. V. Selezneva, N. V. Baranov
{"title":"Hyperfine Interactions in Dichalcogenides CrxNbSe2 (x = 0.33, 0.5): A 93Nb NMR Study","authors":"A. G. Smolnikov, Yu. V. Piskunov, V. V. Ogloblichev, A. F. Sadykov, M. E. Kashnikova, N. A. Utkin, A. P. Gerashchenko, D. F. Akramov, N. V. Selezneva, N. V. Baranov","doi":"10.1134/s0031918x23602524","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>For the first time, an <sup>93</sup>Nb NMR study of dichalcogenides Cr<sub><i>x</i></sub>NbSe<sub>2</sub> (<i>x</i> = 0.33, 0.5) in the paramagnetic state was performed. Analysis of the <sup>93</sup>Nb NMR spectra revealed the presence in Cr<sub><i>x</i></sub>NbSe<sub>2</sub> of three magnetically nonequivalent niobium positions, whose immediate environment contains 0, 1, and 2 chromium ions, respectively. For each Nb position with a different number of chromium atoms in the immediate environment in Cr<sub><i>x</i></sub>NbSe<sub>2</sub> (<i>x</i> = 0.33, 0.5), the values of the components of the magnetic shift and electric field gradient tensors at the position of the niobium nuclei were determined. Evidence was obtained of the formation in Cr<sub>0.33</sub>NbSe<sub>2</sub> of the ordering of chromium ion positions in the <i>ab</i> plane into a <span>\\(\\sqrt 3 \\)</span><i>a</i><sub>0</sub> × <span>\\(\\sqrt 3 \\)</span><i>a</i><sub>0</sub> superstructure. On the other hand, in Cr<sub>0.5</sub>NbSe<sub>2</sub>, no obvious indications of the formation of any superstructure of chromium ion positions were found. It has been established that the overlap of the 4<i>d</i> and 5<i>s</i> shells of niobium ions and the 3<i>d</i> orbitals of chromium leads to the appearance of a positive hyperfine field induced by the magnetic moments of chromium on Nb nuclei. From the temperature dependences of the shift and susceptibility in Cr<sub>0.5</sub>NbSe<sub>2</sub>, an estimate of these induced hyperfine fields is made.</p>","PeriodicalId":20180,"journal":{"name":"Physics of Metals and Metallography","volume":"79 1","pages":""},"PeriodicalIF":1.1000,"publicationDate":"2024-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physics of Metals and Metallography","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1134/s0031918x23602524","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"METALLURGY & METALLURGICAL ENGINEERING","Score":null,"Total":0}
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Abstract
For the first time, an 93Nb NMR study of dichalcogenides CrxNbSe2 (x = 0.33, 0.5) in the paramagnetic state was performed. Analysis of the 93Nb NMR spectra revealed the presence in CrxNbSe2 of three magnetically nonequivalent niobium positions, whose immediate environment contains 0, 1, and 2 chromium ions, respectively. For each Nb position with a different number of chromium atoms in the immediate environment in CrxNbSe2 (x = 0.33, 0.5), the values of the components of the magnetic shift and electric field gradient tensors at the position of the niobium nuclei were determined. Evidence was obtained of the formation in Cr0.33NbSe2 of the ordering of chromium ion positions in the ab plane into a \(\sqrt 3 \)a0 × \(\sqrt 3 \)a0 superstructure. On the other hand, in Cr0.5NbSe2, no obvious indications of the formation of any superstructure of chromium ion positions were found. It has been established that the overlap of the 4d and 5s shells of niobium ions and the 3d orbitals of chromium leads to the appearance of a positive hyperfine field induced by the magnetic moments of chromium on Nb nuclei. From the temperature dependences of the shift and susceptibility in Cr0.5NbSe2, an estimate of these induced hyperfine fields is made.
期刊介绍：
The Physics of Metals and Metallography (Fizika metallov i metallovedenie) was founded in 1955 by the USSR Academy of Sciences. Its scientific profile involves the theory of metals and metal alloys, their electrical and magnetic properties, as well as their structure, phase transformations, and principal mechanical properties. The journal also publishes scientific reviews and papers written by experts involved in fundamental, application, and technological studies. The annual volume of publications amounts to some 250 papers submitted from 100 leading national scientific institutions.
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