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Users Week 2007
May 7-12, 2007

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Workshop 1

Tuesday, May 8
Bldg. 401, Rm. E1100
Afternoon: 1:30 - 5:30

WK1 - Intermediate Energy Science at the Advanced Photon Source

Organizers:
Peter Abbamonte, University of Illinois at Urbana-Champaign
Juan-Carlos Campuzano, University of Illinois at Chicago

To agenda >

(Updated May 6, 2007: Freeland replaces Fradkin)


Overview

Despite decades of intense research many deep questions remain unanswered about the properties of interacting electron systems.  Some examples of such questions are the following: (1) What is the ground state of a frustrated antiferromagnet? (2) Under what circumstances does a material form a collective condensate, such as a charge or spin density wave or superconductor, instead of a sea of Fermions? (3) What is the mechanism of high temperature superconductivity in the copper-oxides?  Such questions require new theoretical concepts for which comparison with reliable experiments is key.  The need for new data has driven swift development, over the last five years, of "low energy" resonant x-ray scattering techniques and "high" energy angle-resolved photoemission techniques, both of which are carried out with 1 keV photons and are focused on studying momentum-resolved valence band effects in condensed matter.  To push the forefront of these techniques a new intermediate energy (1 keV) x-ray collaborative development team (IEX-CDT) has been proposed at the APS and has tentatively been assigned Sector 28.

The purpose of this workshop is to discuss the new scientific and instrumentation approaches that could be enabled by IEX-CDT.  Some examples of topics likely to be addressed are (1) how to exploit the bulk-sensitivity of 1 keV ARPES, (2) how to describe resonant x-ray scattering and relate the signal to valence band effects, (3) how to reach 4K temperatures with moving goniometers, etc.  

Agenda

1:30 – 1:45

Introductory Remarks
Peter Abbamonte, University of Illinois at Urbana-Champaign, and J.C. Campuzano, University of Illinois at Chicago

1:45 – 2:25

Some Experiences with Assessing and Avoiding Surface Effects in Photoemission Spectroscopy of Correlated Electron Materials
Jim Allen, University of Michigan

2:25 – 3:05

Electronic Reconstruction at LaMnO3-SrMnO3 Superlattice Interfaces
Serban Smadici, University of Illinois at Urbana-Champaign

3:05 – 3:20

Break

3:20 – 4:00

Creating Novel Groundstates At the Interface Between Different Complex Oxides
John Freeland, Advanced Photon Source, Argonne National Laboratory

4:00 – 4:40

Charge, Magnetic, and Orbital Ordering: The View from Resonant X-ray Diffraction
Urs Staub, Paul Scherrer Institut

4:40 – 5:20

X-ray Dichroism and the Pseudogap of the Cuprates
Mike Norman, Argonne National Laboratory

5:30

Adjourn

 

 

 

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