Infrared optical absorption spectra of CuO single crystals: Fermion-spinon band and dimensional crossover of the antiferromagnetic order

Seonghoon Jung, Jooyeon Kim, E. J. Choi, Y. Sekio, T. Kimura, J. Lorenzana

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10 Scopus citations

Abstract

We have obtained mid-infrared optical absorption spectra of the S=1/2 quasi-one-dimensional CuO using polarized transmission measurement and interpreted the spectra in terms of phonon-assisted magnetic excitations. When the electric field is parallel to the main antiferromagnetic direction a Δ shaped peak is observed with the maximum at ω=0.23 eV which is attributed to spinons along Cu-O chains. At low temperatures in the antiferromagnetic phase another peak appears at ω=0.16 eV which is attributed to two-magnon absorption but the spinon peak remains. This behavior is interpreted as due to a dimensional crossover where the low-temperature three-dimensional magnetic phase keeps short-range characteristics of a one-dimensional magnet.

Original languageEnglish
Article number140516
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume80
Issue number14
DOIs
StatePublished - 30 Oct 2009

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