Bi掺杂La0.95Sr0.05CoO3强相关钙钛矿中自旋轨道熵驱动的热能增强

IF 3.6 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-06-20 DOI:10.1063/5.0252672

K. P. Mohamed Jibri, R. Amuthan, J. Archana, S. Harish, M. Navaneethan

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引用次数: 0

摘要

在303-753 K的温度下，我们测量了纯多晶和掺Bi的La0.95Sr0.05CoO3的热功率和电阻率。由于LS Co3+离子的稳定和晶体场分裂能的增加，铋掺杂样品的电阻率提高了3.30 Ωcm，热功率为442 μVK−1。加权迁移率μW为2.24 ~ 2.74 cm2V−1s−1，加权载流子浓度nW为8.44 × 1017 ~ 3.87 × 1020 cm−3，与增大的电阻率基本一致。除了载流子对热功率αp的贡献外，自旋态涨落引起的自旋轨道熵贡献αSO= 154 μVK−1的增加导致Bi掺杂La0.95Sr0.05CoO3的热功率异常增强。结果表明，自旋轨道熵是影响强相关氧化物热电性质的关键参数。

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Spin-orbital entropy driven enhanced thermopower in Bi doped La0.95Sr0.05CoO3 strongly correlated perovskite

In this work, we have measured the thermopower and resistivity of polycrystalline pure and Bi doped La0.95Sr0.05CoO3 in the temperature of 303–753 K. The Bi doped sample shows an increased electrical resistivity of 3.30 Ωcm and a positive thermopower of 442 μVK−1 due to the increased crystal field splitting energy and stabilization of LS Co3+ ions. The calculated weighted mobility μW of 2.24 to 2.74 cm2V−1s−1 and weighted carrier concentration nW of 8.44 × 1017 to 3.87 × 1020 cm−3 align well with the increased electrical resistivity. Apart from the carrier contribution to the thermopower αp, the increased spin-orbital entropy contribution αSO= 154 μVK−1 from the spin state fluctuation leads to the anomalous enhancement in thermopower of Bi doped La0.95Sr0.05CoO3. The obtained results indicate that the spin-orbital entropy is a key parameter in driving the thermoelectric properties of strongly correlated oxides.

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.