YBaCo4O7 + x (x = 0, 0.1) System: From Antiferromagnetism to Ferromagnetism

IF 1 4区 物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY
Z. A. Kazei, M. M. Markina, V. V. Snegirev, M. S. Stolyarenko
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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 = MFCMZFC 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.

Abstract Image

YBaCo4O7 + x (x = 0,0.1)体系:从反铁磁性到铁磁性
研究了YBaCo4O7 + x (x = 0,0.1)钴酸盐的磁性和弹性在与化学计量量(x)的轻微可控偏差下的改性。化学计量YBaCo4O7的磁性表现出非平凡的行为,这与普遍接受的具有长程磁序的相变概念不一致。在磁相变温度TN1和TN2下,只有由外磁场(类似于热磁化)引起的磁矩ΔM = MFC - MZFC表现出与杨氏模量异常相一致的异常,而在FC和ZFC模式下的磁化率曲线中,没有发现相变。当偏离化学计量量较小(x = 0.1)时,感应矩ΔM上升了一个数量级,磁化曲线上出现了约10-3 μB的残余铁磁矩。讨论了随着钴离子Co3+含量的增加,钴子系统磁性行为的两种情况。研究发现,当YBaCo4O7 + x钴酸盐偏离化学计量时,其磁性能的演变与基钴酸盐向ca基钴酸盐转变时相似。
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来源期刊
CiteScore
1.90
自引率
9.10%
发文量
130
审稿时长
3-6 weeks
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.
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