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|Title:||ALS-CXRO Seminar | Budhi Godwal (UC Berkeley)|
|When:||10/31/2012 3:00 PM - 4:00 PM|
|Description:||ALS-CXRO Seminar Series|
Wed, Oct 31, 2012
B. K. Godwal
Combined Theory and Experimental Approach to Study Condensed Matter at High Pressures
Predictions of phase transitions, resolving controversies in the experimental data and providing the underlying mechanisms of high pressure phenomena are the major goals of condensed matter theory. Experimental high pressure studies on material bring about direct connection between theory and measurements and provide scientific challenge that the observed effects are difficult to resolve experimentally. High pressure angle dispersive x-ray diffraction studies using high resolution synchrotron sources indicate that there is evidence in the compressibility data for the changes predicted by ab initio theories. Theory is found to be a powerful mean to unravel the mechanisms of phase transitions and an important tool to solve the structure of high pressure phases due to deterioration in the quality of diffraction data from powdered samples. Combined approach of theory and experiment has helped in the detection of subtle electronic phase transitions in elemental solids and compounds and in finding the structure of high pressure phases in intermetallic compounds. The talk will discuss this interaction using computational models available at high performance computing system Lawrencium at LBL for the data collected at High Pressure Beamline 12.2.2 (ALS) for materials which are of interest to Material and Planetary sciences.