Journal
PHYSICAL REVIEW B
Volume 78, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.224518
Keywords
calcium compounds; doping; electron-phonon interactions; high-temperature superconductors; iron compounds; neutron diffraction; potassium compounds; sodium compounds; soft modes; strontium compounds; superconducting transition temperature
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We report inelastic neutron scattering measurements of the phonon density of states of superconducting Sr0.6K0.4Fe2As2 (T-c=32 K) and Ca0.6Na0.4Fe2As2 (T-c=21 K). Compared with the parent compound BaFe2As2 doping affects mainly the lower and intermediate frequency part of the vibrations. Mass effects and lattice contraction cannot solely explain these changes. Softening of phonon modes below 10 meV has been observed in both samples on cooling from 300 to 140 K. In the Ca-doped compound the softening amounts to about 1 meV while for the Sr-doped compound the softening is about 0.5 meV. There is no appreciable change in the phonon density of states on crossing T-c.
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