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Jeudi 27 Fevrier 2014, 14h
Amphi Holweck, Esc C, 1ème etage
Interplay between structure, chemistry and physical properties in the
iron superconductors and related materials
Alaska Subedi
CPHT, Ecole Polytechnique, Palaiseau
The iron superconductors and related materials exhibit diverse
phenomena. I will discuss the use of first principles calculations to
sort out the interplay between the structure and chemistry of these
materials and their physical properties. I will examine the electronic
structure of the iron superconductors and its relevance to the
magnetism and unconventional superconductivity observed in these
compounds. I will then study how the macroscopic properties change
when Ni and Ge are substituted in the place of Fe and pnictides,
respectively, by considering the illustrative cases of BaNi$_2$As$_2$
and YFe$_2$Ge$_2$. I will provide microscopic bases for the
conventional electron-phonon superconductivity in BaNi$_2$As$_2$ and
unconventional spin fluctuation mediated superconductivity in
YFe$_2$Ge$_2$.
The last part of the talk will be devoted to a presentation of my
recent work and ongoing research on the theory of nonlinear phononics
for coherent light-control of solids.