Spin States of Cobalt Ions and a Metal–Semiconductor Transition in Layered Cobaltites PrBaCo2O5 + δ (δ = 0.52, 0.74)

IF 1 4区 物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY
N. I. Solin, S. V. Naumov, A. V. Korolev, V. R. Galakhov
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引用次数: 0

Abstract

The spin states of Co atoms in PrBaCo2O5 + δ with regard to the paramagnetic contribution of Pr3+ ions have been determined from magnetic property studies for δ = 0.52 and 0.74. Results obtained without considering the paramagnetic contribution of Pr3+ ions are inconsistent with available experimental data. With a decrease in temperature, the metal–insulator transition in PrBaCo2O5.52 becomes sharper according to a sharp change in spin states (from HS/LS to LS/IS) of Co3+ ions. In this case, Co3+ ions occupying octahedra pass from the high-spin state (HS, S = 2) to the low-spin one (LS, S = 0) and those occupying pyramids pass from the LS-state to the intermediate spin state (IS, S = 1), as follows from the available structural data. In PrBaCo2O5.74, the metal–semiconductor transition occurs smoothly from HS/LS to the HS/IS state upon the smooth transition of the Co3+ ion state from (LS, S = 0) to the (IS, S = 1) state in pyramides without change in the spin state of ions Co3+ (HS, S = 2) and Co4+ (LS, S = 1/2) in octahedrons.

Abstract Image

Abstract Image

钴离子的自旋态和层状钴矿 PrBaCo2O5 + δ(δ = 0.52,0.74)中的金属-半导体转变
摘要 通过对 δ = 0.52 和 0.74 的磁性研究,确定了 PrBaCo2O5 + δ 中 Co 原子的自旋态与 Pr3+ 离子的顺磁贡献有关。不考虑 Pr3+ 离子顺磁作用的结果与现有实验数据不一致。随着温度的降低,PrBaCo2O5.52 中的金属-绝缘体转变变得更加尖锐,这是因为 Co3+ 离子的自旋态发生了急剧变化(从 HS/LS 到 LS/IS)。在这种情况下,根据现有的结构数据,占据八面体的 Co3+ 离子从高自旋态(HS,S = 2)进入低自旋态(LS,S = 0),而占据金字塔的 Co3+ 离子则从 LS 态进入中间自旋态(IS,S = 1)。在 PrBaCo2O5.74 中,当金字塔中的 Co3+ 离子状态从(LS,S = 0)平稳过渡到(IS,S = 1)状态时,金属-半导体从 HS/LS 状态平稳过渡到 HS/IS 状态,而八面体中的 Co3+ 离子(HS,S = 2)和 Co4+ 离子(LS,S = 1/2)的自旋状态没有发生变化。
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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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