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• W1970563403 abstract "We report the pressure and temperature dependence of the phonon density-of-states in superconducting ${text{Ca}}_{0.6}{text{Na}}_{0.4}{text{Fe}}_{2}{text{As}}_{2}$ $({T}_{c}=21text{ }text{K})$ 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 ${text{CaFe}}_{2}{text{As}}_{2}$ shows softening of the low-energy modes by about 1 meV when decreasing the temperature from 300 to 180 K. There is no appreciable change in the phonon density of states across the structural and antiferromagnetic phase transition at 172 K. These results, combined with our earlier temperature dependent phonon density of states measurements for ${text{Ca}}_{0.6}{text{Na}}_{0.4}{text{Fe}}_{2}{text{As}}_{2}$, indicate that the softening of low-energy phonon modes in these compounds may be due to the interaction of phonons with electron or short-range spin fluctuations in the normal state of the superconducting compound as well as in the parent compound. The phonon spectra are analyzed with ab initio and empirical potential calculations giving partial densities of states and dispersion relations." @default.
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• W1970563403 date "2009-04-20" @default.
• W1970563403 modified "2023-10-16" @default.
• W1970563403 title "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…" @default.
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• W1970563403 doi "https://doi.org/10.1103/physrevb.79.144516" @default.
• W1970563403 hasPublicationYear "2009" @default.
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