EMMD/Oxide MBE: Difference between revisions
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* Atomic flux monitoring by quartz crystal monitor | * Atomic flux monitoring by quartz crystal monitor | ||
* [http://en.wikipedia.org/wiki/Atomic_absorption_spectroscopy Atomic Absorption Spectroscopy] for real time ''in situ'' flux monitoring | * [http://en.wikipedia.org/wiki/Atomic_absorption_spectroscopy Atomic Absorption Spectroscopy] for real time ''in situ'' flux monitoring | ||
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== Highlights == | == Highlights == | ||
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[[Image:oxide_TEM.jpg|thumb|left|400px|Scanning transmission electron micrograph of alternating layers of LaMnO<sub>3</sub> (light contrast) and SrMnO<sub>3</sub> (dark contrast), forming a superlattice that is coherently strained to a SrTiO<sub>3</sub> substrate. Image by Amish Shah, a collaborator at UIUC.]] | [[Image:oxide_TEM.jpg|thumb|left|400px|Scanning transmission electron micrograph of alternating layers of LaMnO<sub>3</sub> (light contrast) and SrMnO<sub>3</sub> (dark contrast), forming a superlattice that is coherently strained to a SrTiO<sub>3</sub> substrate. Image by Amish Shah, a collaborator at UIUC.]] | ||
[[Image:ToCfigure.jpg|thumb|center|450px|X-ray reflectivity of LaMnO<sub>3</sub>/SrMnO<sub>3</sub> superlattices with different Sr content (x), made by depositing single unit cell (~0.4 nm) layers of SrMnO<sub>3</sub> and LaMnO<sub>3</sub>. The superlattice peaks in the reflectivity show that these films are exceptionally smooth, with atomically abrupt interfaces and minimal intermixing. [[EMMD/Oxide MBE/Projects/AF metal|More on this project]] ]] | [[Image:ToCfigure.jpg|thumb|center|450px|X-ray reflectivity of LaMnO<sub>3</sub>/SrMnO<sub>3</sub> superlattices with different Sr content (x), made by depositing single unit cell (~0.4 nm) layers of SrMnO<sub>3</sub> and LaMnO<sub>3</sub>. The superlattice peaks in the reflectivity show that these films are exceptionally smooth, with atomically abrupt interfaces and minimal intermixing. | ||
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Revision as of 02:20, February 5, 2009
Aim
To explore emergent behavior at the interfaces between complex oxides with distinct ground states, where reconstructions of spin, lattice and charge degrees of freedom give rise to novel collective states.
Team
Anand Bhattacharya, Steve May and Tiffany Santos with the oxide-MBE chamber in the CNM.
- Anand Bhattacharya
- Principal Investigator (CNM, MSD)
- Steven May
- Postdoc (MSD)
- Tiffany Santos
- Postdoc (CNM)
Tools
We have designed and commissioned an ozone-assisted molecular beam epitaxy (MBE) system, capable of synthesizing complex oxides with single-atomic layer precision. The system was built by DCA Instruments (Finland).
- Pure ozone as the oxidizing agent
- 10 differentially-pumped Knudsen cells
- 3-pocket electron-beam sources
- In situ reflection high energy electron diffraction (RHEED)
- Atomic flux monitoring by quartz crystal monitor
- Atomic Absorption Spectroscopy for real time in situ flux monitoring
Highlights
CNM News: Frontiers of Complex Oxides Workshop -- Poster Prize
X-ray reflectivity of LaMnO3/SrMnO3 superlattices with different Sr content (x), made by depositing single unit cell (~0.4 nm) layers of SrMnO3 and LaMnO3. The superlattice peaks in the reflectivity show that these films are exceptionally smooth, with atomically abrupt interfaces and minimal intermixing.
Recent Publications
- S. J. May, T. S. Santos and A. Bhattacharya, "Onset of Metallic Behavior in Strained (LaNiO3)n/(SrMnO3)2 Superlattices," submitted to Phys. Rev. B
- Tiffany S. Santos, Steven J. May, J. Lee Robertson and Anand Bhattacharya, "Stabilizing an Antiferromagnetic Metal in La1-xSrxMnO3 by Digital Synthesis, manuscript in preparation
- S. J. May, A. B. Shah, S. G. E. te Velthuis, M. R. Fitzsimmons, J. M. Zuo, X. Zhai, J. N. Eckstein, S. D. Bader and A. Bhattacharya, "Magnetically Asymmetric Interfaces in a LaMnO3/SrMnO3 Superlattice due to Structural Asymmetries," Phys. Rev. B 77, 174409 (2008).
- A. Bhattacharya, S. J. May, S. G. E. te Velthuis, M. Warusawithana, X. Zhai, Bin Jiang, J.-M. Zuo, M. R. Fitzsimmons, S. D. Bader and J. N. Eckstein, "Metal-Insulator Transition and Its Relation to Magnetic Structure in (LaMnO3)2n/(SrMnO3)n Superlattices," Phys. Rev. Lett. 100, 257203 (2008).
- Serban Smadici, Peter Abbamonte, Anand Bhattacharya, Xiaofang Zhai, Bin Jiang, Andrivo Rusydi, James N. Eckstein, Samuel D. Bader and Jian-Min Zuo, "Electronic Reconstruction at SrMnO3-LaMnO3 Superlattice Interfaces," Phys. Rev. Lett. 99, 196404 (2007).