EMMD/Oxide MBE: Difference between revisions

From CNM Wiki
Jump to navigation Jump to search
(copied from internal page, internal-only links removed)
 
m (use default template paramters)
 
(5 intermediate revisions by the same user not shown)
Line 1: Line 1:
{{inside}}
== Aim ==
== 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.
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 ==
== Team ==
[[Image:oxide_mbe.jpg|frame|right|200 px|Anand Bhattacharya, Steve May and Tiffany Santos with the oxide-MBE chamber in the CNM.]]
[[Image:oxide_mbe.jpg|frame|right|200 px|Anand Bhattacharya (front), Steve May and Tiffany Santos with the oxide-MBE chamber in the CNM.]]
* Anand Bhattacharya
; Anand Bhattacharya: ''Principal Investigator (CNM, MSD)''
: ''Principal Investigator (CNM, MSD)''
; Steven May: ''Postdoc (MSD)''
 
; Tiffany Santos: ''Postdoc (CNM)''
* Steven May
: ''Postdoc (MSD)''
 
* Tiffany Santos
: ''Postdoc (CNM)''


== Tools ==
== 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 (Finland).
We have designed and commissioned an ozone-assisted [http://en.wikipedia.org/wiki/Molecular_beam_epitaxy molecular beam epitaxy (MBE)] system, capable of synthesizing complex oxides with single-atomic layer precision. The system was built by [http://www.dca.fi/ DCA Instruments (Finland)].


* Pure ozone as the oxidizing agent
* Pure ozone as the oxidizing agent
* 10 differentially-pumped Knudsen cells
* 10 differentially-pumped [http://en.wikipedia.org/wiki/Knudsen_Cell Knudsen cells]
* 3-pocket electron-beam sources
* 3-pocket electron-beam sources
* ''In situ'' reflection high energy electron diffraction
* ''In situ'' [http://en.wikipedia.org/wiki/RHEED reflection high energy electron diffraction (RHEED)]
* Atomic flux monitoring by quartz crystal monitor
* Atomic flux monitoring by quartz crystal monitor
* Atomic Absorption Spectroscopy for real time ''in situ'' flux monitoring, ''in progress''
* [http://en.wikipedia.org/wiki/Atomic_absorption_spectroscopy Atomic Absorption Spectroscopy] for real time ''in situ'' flux monitoring
<br>
<br clear="all" />


== Highlights ==
== Highlights ==
[http://nano.anl.gov/news/highlights/2008_mbe.html CNM News: Frontiers of Complex Oxides Workshop -- Poster Prize]
[http://nano.anl.gov/news/highlights/2008_mbe.html CNM News: Frontiers of Complex Oxides Workshop -- Poster Prize]


[[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.
<br clear="all" /> <!-- http://en.wikipedia.org/wiki/Wikipedia:Extended_image_syntax#Cancelling_floating-around-image_mode -->
<!-- Link commented out -->
 
<!-- [[EMMD/Oxide MBE/Projects/AF metal|More on this project]] -->
]]
<br clear="all" />


== Recent Publications ==
== Recent Publications ==

Latest revision as of 03:07, February 5, 2009

View intranet version

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 (front), 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).


Highlights

CNM News: Frontiers of Complex Oxides Workshop -- Poster Prize

Scanning transmission electron micrograph of alternating layers of LaMnO3 (light contrast) and SrMnO3 (dark contrast), forming a superlattice that is coherently strained to a SrTiO3 substrate. Image by Amish Shah, a collaborator at UIUC.
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).