Coupling between magnon and ligand-field excitations in magnetoelectric Tb3Fe5 O12 garnet

Document Type

Article

Publication Date

7-15-2010

Abstract

The spectra of far-infrared transmission in Tb3 Fe5 O12 magnetoelectric single crystals have been studied in the range between 15 and 100 cm-1, in magnetic fields up to 10 T, and for temperatures between 5 and 150 K. We attribute some of the observed infrared-active excitations to electric dipole transitions between ligand-field split states of Tb3+ ions. Anticrossing between the magnetic exchange excitation and the ligand-field transition occurs at the temperature between 60 and 80 K. The corresponding coupling energy for this interaction is 6cm -1. Temperature-induced softening of the hybrid IR excitation correlates with the increase in the static dielectric constant. We discuss the possibility for hybrid excitations of magnons and ligand-field states and their possible connection to the magnetoelectric effect in Tb3 Fe 5 O12. © 2010 The American Physical Society.

Identifier

77956528188 (Scopus)

Publication Title

Physical Review B Condensed Matter and Materials Physics

External Full Text Location

https://doi.org/10.1103/PhysRevB.82.014414

e-ISSN

1550235X

ISSN

10980121

Issue

1

Volume

82

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