{"title":"A-Site Order-Disorder Evolution in Double Manganites RBaMn2O6 (R = Pr, Nd)","authors":"","doi":"10.1134/s0031918x23602421","DOIUrl":null,"url":null,"abstract":"<span> <h3>Abstract</h3> <p>Structural, magnetic and optical properties of double manganites PrBaMn<sub>2</sub>O<sub>6</sub> and NdBaMn<sub>2</sub>O<sub>6</sub> are studied depending on the degree of ordering in the A-position. It is shown that, annealing induced disordering goes in an initial stage throw formation of a two-phase state: a phase with a high A-site ordering with <em>T</em><sub>C</sub> ∼ 280–300 K and a phase with a low ordering of ~30% with significantly lower <em>T</em><sub>C</sub> coexist. In partially ordered PrBaMn<sub>2</sub>O<sub>6</sub> samples there are metal-insulator transitions near <em>T</em><sub>C</sub> of the each coexisting phases. In partially ordered NdBaMn<sub>2</sub>O<sub>6</sub> in a highly A-site ordered high-temperature phase, there is no metal-insulator transition due to the destruction of the channels for metallic conductivity formed by the ordering of the <em>x</em><sup>2</sup>‒<em>y</em><sup>2</sup> orbitals. If a metal-insulator transition takes place, the application of a magnetic field leads to the effect of magnetotransmission near <em>T</em><sub>C</sub>, which is associated with a change in the concentration of delocalized charge carriers.</p> </span>","PeriodicalId":20180,"journal":{"name":"Physics of Metals and Metallography","volume":"11 1","pages":""},"PeriodicalIF":1.1000,"publicationDate":"2024-02-05","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/s0031918x23602421","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
Structural, magnetic and optical properties of double manganites PrBaMn2O6 and NdBaMn2O6 are studied depending on the degree of ordering in the A-position. It is shown that, annealing induced disordering goes in an initial stage throw formation of a two-phase state: a phase with a high A-site ordering with TC ∼ 280–300 K and a phase with a low ordering of ~30% with significantly lower TC coexist. In partially ordered PrBaMn2O6 samples there are metal-insulator transitions near TC of the each coexisting phases. In partially ordered NdBaMn2O6 in a highly A-site ordered high-temperature phase, there is no metal-insulator transition due to the destruction of the channels for metallic conductivity formed by the ordering of the x2‒y2 orbitals. If a metal-insulator transition takes place, the application of a magnetic field leads to the effect of magnetotransmission near TC, which is associated with a change in the concentration of delocalized charge carriers.
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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