Strain effect on orbital and magnetic structures of Mn ions in epitaxial Nd 0.35 Sr 0.65 MnO 3 /SrTiO 3 films using X-ray diffraction and absorption

Y. C. Shao, N. G. Deshpande, Y. Y. Chin, S. H. Hsieh, C. H. Du, H. T. Wang, J. W. Chiou, H. M. Tsai, H. J. Lin, S. L. Cheng, J. G. Lin, K. Asokan, P. H. Yeh, W. F. Pong

研究成果: 雜誌貢獻期刊論文同行評審

摘要

This study probes the temperature-dependent strain that is strongly correlated with the orbital and magnetic structures of epitaxial films of Nd 0.35 Sr 0.65 MnO 3 (NSMO) that are fabricated by pulsed laser deposition with two thicknesses, 17 (NS17) and 103 nm (NS103) on SrTiO 3 (STO) substrate. This investigation is probed using X-ray diffraction (XRD) and absorption-based techniques, X-ray linear dichroism (XLD) and the X-ray magnetic circular dichroism (XMCD). XRD indicates a significant shift in the (004) peak position that is associated with larger strain in NS17 relative to that of NS103 at both 30 and 300 K. Experimental and atomic multiplet simulated temperature-dependent Mn L 3,2 -edge XLD results reveal that the stronger strain in a thinner NS17 film causes less splitting of Mn 3d e g state at low temperature, indicating an enhancement of orbital fluctuations in the band above the Fermi level. This greater Mn 3d orbital fluctuation can be the cause of both the enhanced ferromagnetism (FM) as a result of spin moments and the reduced Néel temperature of C-type antiferromagnetism (AFM) in NS17, leading to the FM coupling of the canted-antiferromagnetism (FM-cAFM) state in NSMO/STO epitaxial films at low temperature (T = 30 K). These findings are also confirmed by Mn L 3,2 -edge XMCD measurements.

原文???core.languages.en_GB???
文章編號5160
期刊Scientific Reports
9
發行號1
DOIs
出版狀態已出版 - 1 12月 2019

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