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We report the first experiments on the high pressure phonon spectra oftransition-metal nitrides HfN, ZrN, and NbN, obtained by Raman scatteringmeasurements. Two pronounced bands, which are related to the acoustic part atlow frequency around 200 cm$^{-1}$ and the optical part at high frequencyaround 550 cm$^{-1}$ of the phonon spectrum, respectively, shift to highfrequency values with increasing pressure. An analysis of the results allows usto reproduce the experimental pressure dependence of the superconductingtransition temperature $T_{c}$ of ZrN and NbN.Comment: 19 pages and 6 figure

Pressure-induced phonon frequency shifts in transition-metal nitrides