Raman scattering from YBa2Fe3O8+d

Abstract

The results of polarized micro-Raman scattering experiments on YBa 2 Fe 3 O 8 + δ with δ=0.1 are reported. We identified seven out of the total ten by symmetry Raman-allowed phonons at 134 cm − 1 ( A 1 g ), 148 cm − 1 ( E g ), 219 cm − 1 ( A 1 g ), 300 cm − 1 ( B 1 g ), 478 cm − 1 ( A 1 g ), 493 cm − 1 ( E g ), and 691 cm − 1 ( A 1 g ). The Raman-active phonons are assigned to definite atomic vibrations in close comparison with the structurally similar YBa 2 Cu 3 O 6 , usually simple considerations based on charge and bond length. © 1994 American Physical Society