Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-11-13
Phys. Rev. B 80, R140516 (2009) (Rapid Communication)
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 5 figures
Scientific paper
10.1103/PhysRevB.80.140516
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 Delta shaped peak is observed with the maximum at 0.23eV which is attributed to spinons along Cu-O chains. At low temperatures in the antiferromagnetic phase another peak appears at 0.16eV 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.
Choi Eun Jip
Jung SeongHoon
Kim Jooyeon
Kimura Tadahiko
Lorenzana Jose
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