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Physical Review B
The polarized Raman spectra of layered ruthenate Ca 3 Ru 2 O 7 were measured between 5 and 300 K in several exact scattering configurations. All observed Raman lines were assigned to definite phonon modes of A 1 or A 2 symmetry on the basis of their polarization properties and by comparison to the results of lattice dynamical calculations for the orthorhombic A2 1 ma structure. It is established that the Fano-shaped A 2 mode, which exhibits a strong anomaly near the metal-nonmetal transition atdoi:10.1103/physrevb.71.214305 fatcat:hlmeym52crccbbhherxbfkpome