Artificial Construction of the Layered Ruddlesden鈥揚opper Manganite La2Sr2Mn3O10 by Reflection High Energy Electron Diffraction Monitored Pulsed Laser Deposi

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• 作者：Robert G. Palgrave ; Pavel Borisov ; Matthew S. Dyer ; Sean R. C. McMitchell ; George R. Darling ; John B. Claridge ; Maria Batuk ; Haiyan Tan ; He Tian ; Jo Verbeeck ; Joke Hadermann ; Matthew J. Rosseinsky
• 刊名：The Journal of the American Chemical Society
• 出版年：2012
• 出版时间：May 9, 2012
• 年：2012
• 卷：134
• 期：18
• 页码：7700-7714
• 全文大小：753K
• 年卷期：v.134,no.18(May 9, 2012)
• ISSN：1520-5126

文摘

Pulsed laser deposition has been used to artificially construct the n = 3 Ruddlesden鈥揚opper structure La₂Sr₂Mn₃O₁₀ in epitaxial thin film form by sequentially layering La_1鈥?i>xSr_xMnO₃ and SrO unit cells aided by in situ reflection high energy electron diffraction monitoring. The interval deposition technique was used to promote two-dimensional SrO growth. X-ray diffraction and cross-sectional transmission electron microscopy indicated that the trilayer structure had been formed. A site ordering was found to differ from that expected thermodynamically, with the smaller Sr²⁺ predominantly on the R site due to kinetic trapping of the deposited cation sequence. A dependence of the out-of-plane lattice parameter on growth pressure was interpreted as changing the oxygen content of the films. Magnetic and transport measurements on fully oxygenated films indicated a frustrated magnetic ground state characterized as a spin glass-like magnetic phase with the glass temperature T_g 鈮?34 K. The magnetic frustration has a clear in-plane (ab) magnetic anisotropy, which is maintained up to temperatures of 150 K. Density functional theory calculations suggest competing antiferromagnetic and ferromagnetic long-range orders, which are proposed as the origin of the low-temperature glassy state.