Raman study of the metal-insulator transition in pyroclilore Mo oxides

K. Taniguchi, T. Katsufuji, S. Iguchi, Y. Taguchi, H. Takagi, Y. Tokura

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20 Citations (Scopus)


Raman scattering spectra have been investigated for the correlated 4d-electron system, R2Mo2O7 (Tf=Nd, Sm, Gd, Tb,Dy,Nd1-xDyx), which undergoes a metal-insulator transition with changing the rare-earth ion R, or equivalently the one-electron bandwidth. It is found that several phonon peaks modulating the Mo-O-Mo bond angle appear in the metallic phase (R=Nd, Sm, Gd, Nd1-xJDy x), whereas they are remarkably suppressed in intensity in the insulating phase (R=Tb,Dy). This result indicates that the phonon modes of R2Mo2O7 are coupled with the electron-hole excitation across the Fermi level, thus probing sensitively the low-energy charge dynamics in the vicinity of the bandwidth-control Mott transition.

Original languageEnglish
Article number100401
Pages (from-to)100401-1-100401-4
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number10
Publication statusPublished - 2004 Sept


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