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

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SeongHoon Jung, Jooyeon Kim, and E. J. Choi
Department of Physics, University of Seoul, Seoul 130-743, Republic of Korea

Y. Sekio and T. Kimura
Division of Materials Physics, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan

J. Lorenzana
SMC-INFM-CNR, ISC-CNR and Dipartimento di Fisica, Università di Roma “La Sapienza,” P. Aldo Moro 2, 00185 Roma, Italy

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Received 7 October 2009; published 30 October 2009; corrected 4 November 2009

Wehave obtained mid-infrared optical absorption spectra of the S=1/2 quasi-one-dimensionalCuO using polarized transmission measurement and interpreted the spectra interms of phonon-assisted magnetic excitations. When the electric field isparallel to the main antiferromagnetic direction a Delta shaped peakis observed with the maximum at omega =0.23 eV which is attributedto spinons along Cu-O chains. At low temperatures in theantiferromagnetic phase another peak appears at omega =0.16 eV which is attributedto two-magnon absorption but the spinon peak remains. This behavioris interpreted as due to a dimensional crossover where thelow-temperature three-dimensional magnetic phase keeps short-range characteristics of a one-dimensionalmagnet.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.80.140516
DOI:	10.1103/PhysRevB.80.140516
PACS:	74.72.-h; 74.25.Gz; 78.20.Ls; 71.10.Pm 74.72.-h Cuprate superconductors 74.25.Gz Optical properties of superconductors 78.20.Ls Magnetooptical effects (bulk materials/thin films) 71.10.Pm Fermions in reduced dimensions (condensed matter) YEAR: 2009
KEYWORDS:	antiferromagnetic materials, copper compounds, fermion systems, infrared spectra, magnons, phonons

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Erratum

Publisher's Note: Infrared optical absorption spectra of CuO single crystals: Fermion-spinon band and dimensional crossover of the antiferromagnetic order [Phys. Rev. B 80, 140516(R) (2009)]
SeongHoon Jung, Jooyeon Kim, E. J. Choi et al.
Phys. Rev. B 80, 189902 (E) (2009)