Optical spectroscopy in CoO: Phononic, electric, and magnetic excitation spectrum within the charge-transfer gap

Kant C.
Rudolf T.
Schrettle F.
Mayr F.
Deisenhofer J.
Lunkenheimer P.
Eremin M.
Loidl A.

Publication date

January 2008

Journal

Physical Review B

Abstract

The reflectivity of single-crystalline CoO has been studied by optical spectroscopy for wave numbers ranging from 100 to 28 cm-1 and for temperatures 8<T<325 K. A splitting of the cubic IR-active phonon mode on passing the antiferromagnetic phase transition at TN =289 K has been observed. At low temperatures the splitting amounts to 15.0 cm-1. In addition, we studied the splitting of the cubic crystal-field ground state of the Co2+ ions due to spin-orbit coupling, a tetragonal crystal field, and exchange interaction. Below TN, magnetic-dipole transitions between the exchange-split levels are identified, and the energy-level scheme can be well described with a spin-orbit coupling λ=151.1 cm-1, an exchange constant J=17.5 cm-1, and a tetragon...

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Optical spectroscopy in CoO: Phononic, electric, and magnetic excitation spectrum within the charge-transfer gap

Abstract

Extracted data

Optical spectroscopy in CoO: Phononic, electric, and magnetic excitation spectrum within the charge-transfer gap

Abstract

Extracted data

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