title: Infrared investigation of the phonon spectrum in the frustrated spin cluster compound FeTe(2)O(5)Cl.
abstract: We present our optical investigations on the frustrated spin cluster compound FeTe(2)O(5)Cl, which develops a long-range antiferromagnetic order below 10 K. We measure the optical reflectivity from the far-infrared to the ultraviolet with polarized light. We focus our attention on the lattice dynamics by discussing the infrared-active modes. Our findings reveal a polarization dependence of the vibrational modes but which do not seem to be affected by structural anomalies linked to the magnetically ordered state at low temperatures.
authors.affiliation: Laboratorium für Festkörperphysik, ETH Zürich, CH-8093 Zürich, Switzerland.
authors.forename: F
authors.initials: F
authors.lastname: Pfuner
authors.forename: L
authors.initials: L
authors.lastname: Degiorgi
authors.forename: H
authors.initials: H
authors.lastname: Berger
authors.forename: L
authors.initials: L
authors.lastname: Forró