In-plane polarized collective modes in detwinned YBa${}_2$Cu${}_3$O${}_{6.95}$ observed by spectral ellipsometry

C. Bernhard, T. Holden, J. Humlíček +8

The in-plane dielectric response of detwinned YBa${}_2$Cu${}_3$O${}_{6.95}$ has been studied by far-infared ellipsometry. A surprisingly lare number of in-plane polarized modes are o…