Brillouin Scattering Studies of La₀.₇₇Ca₀.₂₃MnO₃ Across Metal-Insulator Transition
Seikh, Md. Motin · Narayana, Chandrabhas · Sudheendra, L. · Sood, A. K. · Rao, C. N. R.
Original · EN
Temperature-dependent Brillouin scattering studies have been carried out on La₀.₇₇Ca₀.₂₃MnO₃ across the paramagnetic insulator - ferromagnetic metal (I-M) transition. The spectra show a surface Rayleigh wave (SRW) and a high velocity pseudo surface acoustic wave (HVPSAW) besides bulk acoustic waves (BAW). The Brillouin shifts associated with SRW and HVPSAW show blue-shifts, where as the frequencies of the BAW decrease below the I-M transition temperature (TC) of 230 K. These results can be understood based on the temperature dependence of the elastic constants. We also observe a central peak whose width is maximum at TC.
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