  We present theoretical and experimental studies of superconductivity and low
temperature structural phase boundaries in lithium. We mapped the structural
phase diagram of 6Li and 7Li under hydrostatic conditions between 5 top 55GPa
and within the temperature range of 15 to 75K, observing the FCC-hR1-cI16 phase
transitions. 6Li and 7Li show some differences at the structural boundaries,
with a potential shift of the phase boundaries of 6Li to lower pressures.
Density functional theory calculations and topological analysis of the electron
density elucidates the superconducting properties and interatomic interactions
within these phases of lithium.
