High-pressure experimental and theoretical investigations on the fluorite structured compound AuAl{sub 2}

Diamond anvil cell (DAC) based resistance measurements are carried out in AuAl{sub 2} to the pressures of about 25 GPa for the first time. The data indicate possibility of phase transition around 12 GPa. High pressure data obtained using Elettra synchrotron source confirm the transformation of AuAl{...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2005-07, Vol.72 (2)
Main Authors: Garg, Alka B., Verma, Ashok K., Vijayakumar, V., Rao, R.S., Godwal, B.K.
Format: Article
Language:English
Subjects:
ALUMINIUM ALLOYS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
CUBIC LATTICES
ELECTRIC CONDUCTIVITY
EQUATIONS OF STATE
GOLD ALLOYS
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
PHASE TRANSFORMATIONS
PRESSURE DEPENDENCE
PRESSURE RANGE GIGA PA
SYNCHROTRON RADIATION SOURCES
TOPOLOGY
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Summary:Diamond anvil cell (DAC) based resistance measurements are carried out in AuAl{sub 2} to the pressures of about 25 GPa for the first time. The data indicate possibility of phase transition around 12 GPa. High pressure data obtained using Elettra synchrotron source confirm the transformation of AuAl{sub 2} from ambient CaF{sub 2} to orthorhombic phase. The high precision P-V data when transformed to universal equation of state does not show any deviation from linearity. The first principles electronic band structure calculations up to these pressures in the cubic phase do not reveal any change corroborating the experimental findings of nonobservation of electronic topological transition in this compound.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.72.024112