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Theory of Metalinsulator Transition

#0829


Theoretical Investigation of Metal-Insulator Phase Transitions in Strongly Corrected Metals and Analysis of their Feasible Applications

Tech Area / Field

  • PHY-SSP/Solid State Physics/Physics

Status
8 Project completed

Registration date
30.12.1996

Completion date
10.04.2002

Senior Project Manager
Karabashev S G

Leading Institute
VNIIEF, Russia, N. Novgorod reg., Sarov

Collaborators

  • Los-Alamos National Laboratory, USA, NM, Los-Alamos

Project summary

Goals of the Project:
- Developing of microscopic models for calculations of properties of strongly correlated metals.
- Analysis of dynamics of metal-insulator phase transition under magnetic field or heat pulse for different configurations (plane, cylindrical).
- Analysis of feasible applications of metal-insulator phase transitions in pulsed power technique (opening switches, sharpening of magnetic field pulses).

Technical approach and Methodology

To build a new variation model, a trial wave function of Gutzwiller type will be used. By contrast to the Gutzwiller trial wave function, the new one will comprise variation parameters related to nearest-neighbor correlation in addition to a parameter of intrasite correlations. To determine quasi-particle spectrum two methods will be applied-namely, Fermi liquid one used for the Gutzwiller approach and microscopic one based on auxiliary boson technique. The new model will be applied to an analysis of the phase transitions in V2O3 and related materials under magnetic field at nonzero temperatures.

The investigation of magnetic properties of Slater's AFM will be carried out. Behavior in transverse magnetic field, phase transitions of the first order will be determined. All the results will be applied to phase diagram of NiS.

An analytical estimations and numerical calculations of movement of a phase transition wave in polycrystalline V2O3 under pulsed magnetic field with consideration for heating and pressure of magnetic field. The results will be used in an analysis of applicability of strongly correlated metals in opening switches and for pulse sharpening.

Participation of foreign collaborators

(1) Prof. James Brooks is a consultant on material science and participates in discussions of results of the work, (2) Dr. Wilfred Lewis is a consultant on pulsed power installations and discusses feasible pulsed power applications.


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