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Phonon spectra in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>CaFe</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mtext>As</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Ca</mml:mtext></mml:mrow><mml:mrow><mml:mn>0.6</mml:mn></mml:mrow></mml:msub><mml:msub…
We report the pressure and temperature dependence of the phonon density-of-states in superconducting ${\text{Ca}}_{0.6}{\text{Na}}_{0.4}{\text{Fe}}_{2}{\text{As}}_{2}$ $({T}_{c}=21\text{ }\text{K})$ and the parent compound ${\text{CaFe}}_{2}{\text{As}}_{2}$ using inelastic neutron scattering. We observe no significant change in the phonon spectrum for ${\text{Ca}}_{0.6}{\text{Na}}_{0.4}{\text{Fe}}_{2}{\text{As}}_{2}$ at 295 K up to pressures of 5 kbar. The phonon spectrum for ${\text{CaFe}}_{2}{\text{As}}_{2}$ …