Superconductivity in the Americium Metal as a Function of Pressure: Probing the Mott Transition.
High pressure measurements of the resistivity of americium metal are reported to 27 GPa and down to temperatures of 0.4 K. The unusual dependence of the superconducting temperature (Tc) on pressure is deduced. The critical field (H extrapolated to T) increases dramatically from 0.05 to 0.1 T as the
pressure is increased, suggesting that the type of superconductivity is changing as pressure increases. At pressures of 16 GPa the 5f electrons of Am are changing from localized to itinerant, and the crystal structure also transforms to a complex one. The role of a Mott type transition in the development of the peak in Tc above 16 GPa is postulated.
GRIVEAU Jean-Christophe;
REBIZANT Jean;
LANDER Gerard;
KOTLIAR G.;
2005-05-25
AMERICAN PHYSICAL SOC
JRC30004
https://publications.jrc.ec.europa.eu/repository/handle/JRC30004,
10.1103/PhysRevLett.94.097002,
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