Difference between the cleaved surface and the polished surface on the Raman spectra of La${}_{2-x}$Sr${}_x$CuO${}_4$

S. Sugai, Y. Takayanagi, N. Hayamizu

The Raman spectra on the cleaved surface of La${}_{2-x}$Sr${}_x$CuO${}_4$ is found to be different from those on the mechanically polished or chemically etched surface. On the cleaved su…