Z. A. Kazei, M. M. Markina, V. V. Snegirev, M. S. Stolyarenko
{"title":"YBaCo4O7 + x (x = 0, 0.1) System: From Antiferromagnetism to Ferromagnetism","authors":"Z. A. Kazei, M. M. Markina, V. V. Snegirev, M. S. Stolyarenko","doi":"10.1134/S1063776123070038","DOIUrl":null,"url":null,"abstract":"<p>The modification of magnetic and elastic properties of YBaCo<sub>4</sub>O<sub>7 +</sub> <sub><i>x</i></sub> (<i>x</i> = 0, 0.1) cobaltites at a slight controlled deviation from stoichiometry (<i>x</i>) has been investigated. The magnetic properties of stoichiometric YBaCo<sub>4</sub>O<sub>7</sub> demonstrate nontrivial behavior, which is inconsistent with the generally accepted notion of phase transitions with long-range magnetic order. Only magnetic moment Δ<i>M</i> = <i>M</i><sub><i>FC</i></sub> – <i>M</i><sub><i>ZFC</i></sub> induced by an external magnetic field (an analog of thermoremanent magnetization) exhibits anomalies at magnetic phase transition temperatures <i>T</i><sub><i>N</i>1</sub> and <i>T</i><sub><i>N</i>2</sub> that coincide with those of Young’s modulus anomalies, whereas in the magnetic susceptibility curves taken in the FC and ZFC modes, phase transitions are not discerned. At a small off-stoichiometry (<i>x</i> = 0.1), induced moment Δ<i>M</i> rises by an order of magnitude and a residual ferromagnetic moment of about 10<sup>–3</sup> μ<sub>B</sub> arises in the magnetization curves. Two scenarios of the cobalt subsystem magnetic behavior with increasing part of cobalt ions Co<sup>3+</sup> have been discussed. It has been found that when YBaCo<sub>4</sub>O<sub>7 +</sub> <sub><i>x</i></sub> cobaltites deviate from stoichiometry, the evolution of their magnetic properties is similar to that observed at the transition from Y-based to Ca-based cobaltite.</p>","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":null,"pages":null},"PeriodicalIF":1.0000,"publicationDate":"2023-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Experimental and Theoretical Physics","FirstCategoryId":"101","ListUrlMain":"https://link.springer.com/article/10.1134/S1063776123070038","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"PHYSICS, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
The modification of magnetic and elastic properties of YBaCo4O7 +x (x = 0, 0.1) cobaltites at a slight controlled deviation from stoichiometry (x) has been investigated. The magnetic properties of stoichiometric YBaCo4O7 demonstrate nontrivial behavior, which is inconsistent with the generally accepted notion of phase transitions with long-range magnetic order. Only magnetic moment ΔM = MFC – MZFC induced by an external magnetic field (an analog of thermoremanent magnetization) exhibits anomalies at magnetic phase transition temperatures TN1 and TN2 that coincide with those of Young’s modulus anomalies, whereas in the magnetic susceptibility curves taken in the FC and ZFC modes, phase transitions are not discerned. At a small off-stoichiometry (x = 0.1), induced moment ΔM rises by an order of magnitude and a residual ferromagnetic moment of about 10–3 μB arises in the magnetization curves. Two scenarios of the cobalt subsystem magnetic behavior with increasing part of cobalt ions Co3+ have been discussed. It has been found that when YBaCo4O7 +x cobaltites deviate from stoichiometry, the evolution of their magnetic properties is similar to that observed at the transition from Y-based to Ca-based cobaltite.
期刊介绍:
Journal of Experimental and Theoretical Physics is one of the most influential physics research journals. Originally based on Russia, this international journal now welcomes manuscripts from all countries in the English or Russian language. It publishes original papers on fundamental theoretical and experimental research in all fields of physics: from solids and liquids to elementary particles and astrophysics.