Far- and mid-infrared spectrum of YBa2Cu3O6.0 in high magnetic fields

Abstract

The far- and mid-infrared spectrum of antiferromagnetic YBa{sub 2}Cu{sub 3}O{sub 6.0} was investigated by infrared transmission measurements (k{parallel} c-axis) in high magnetic fields up to 16.5 Tesla at T=1K. A peak at 1436 cm{sup {minus}1} which previously was assigned to the excitation of single optical magnons did not show a measurable shift with magnetic field. In the far-infrared, no signature of acoustic magnon absorption has been observed in the magneto transmittance. However, at 83 cm{sup {minus}1} the sixth phonon of symmetry E{sub u} in YBa{sub 2}Cu{sub 3}O{sub 6.0} has been found.