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对于H||ab的氧化YBaCuAlO单晶的磁通跳跃、团簇分布模型和涡旋相图。

Flux jumps, cluster distribution model and vortex phase diagram of oxygenated YBaCuAlO single crystals for H|| ab.

作者信息

Babu Ashna, Sruthy S P, Jaiswal-Nagar D

机构信息

School of Physics, IISER Thiruvananthapuram, Vithura, Kerala, 695551, India.

出版信息

Sci Rep. 2024 Dec 28;14(1):30693. doi: 10.1038/s41598-024-78217-5.

DOI:10.1038/s41598-024-78217-5
PMID:39730391
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11681208/
Abstract

This work reports magnetic field direction dependent second magnetisation peak (SMP) anomaly in single crystals of oxygenated [Formula: see text] for [Formula: see text] ab. Detailed investigations on crystal A revealed the direction dependence of SMP anomaly at temperatures below 25 K, above which the direction dependence vanishes. The state of spatial order of the vortex lattice was found to be correlated to the vortex lattice symmetry that underwent a change at certain fields and was captured via single flux jumps observed in the third and fifth quadrant of magnetisation hysteresis loops. Bean's critical state profiles drawn to explain the flux jumps required the presence of clusters of [Formula: see text] in the basal plane of [Formula: see text] with closely lying binding energies. Large full width at half maximum observed in Cu, O, Y and Ba photoelectron spectra confirmed the validity of the proposed cluster model. A vortex phase diagram incorporating all features in the magnetisation hysteresis loops has been made for oxygenated [Formula: see text] for [Formula: see text] || ab depicting various phases.

摘要

这项工作报道了在氧合的[化学式：见原文]单晶中，对于[化学式：见原文] ab方向，存在磁场方向依赖的二次磁化峰（SMP）异常。对晶体A的详细研究揭示了在低于25 K的温度下SMP异常的方向依赖性，高于该温度时方向依赖性消失。发现涡旋晶格的空间有序状态与涡旋晶格对称性相关，涡旋晶格对称性在某些场中发生变化，并通过在磁化滞回环的第三和第四象限中观察到的单磁通跳跃得以捕捉。为解释磁通跳跃而绘制的Bean临界态曲线要求在[化学式：见原文]的基面中存在具有紧密相邻结合能的[化学式：见原文]团簇。在Cu、O、Y和Ba光电子能谱中观察到的较大半高宽证实了所提出的团簇模型的有效性。针对氧合的[化学式：见原文]，对于[化学式：见原文] || ab方向，绘制了包含磁化滞回环中所有特征的涡旋相图，描绘了各种相。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/34d2/11681208/d50ad2e59600/41598_2024_78217_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/34d2/11681208/9bca18c79c9f/41598_2024_78217_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/34d2/11681208/fdc675d35eea/41598_2024_78217_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/34d2/11681208/e7e5b6f13801/41598_2024_78217_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/34d2/11681208/a19a6156b743/41598_2024_78217_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/34d2/11681208/692cc215b172/41598_2024_78217_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/34d2/11681208/5ae559ce5809/41598_2024_78217_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/34d2/11681208/d967380ef4d1/41598_2024_78217_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/34d2/11681208/d50ad2e59600/41598_2024_78217_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/34d2/11681208/9bca18c79c9f/41598_2024_78217_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/34d2/11681208/fdc675d35eea/41598_2024_78217_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/34d2/11681208/e7e5b6f13801/41598_2024_78217_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/34d2/11681208/a19a6156b743/41598_2024_78217_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/34d2/11681208/692cc215b172/41598_2024_78217_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/34d2/11681208/5ae559ce5809/41598_2024_78217_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/34d2/11681208/d967380ef4d1/41598_2024_78217_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/34d2/11681208/d50ad2e59600/41598_2024_78217_Fig8_HTML.jpg

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本文引用的文献

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