Infrared phonon anomaly and magnetic excitations in single-crystal Cu${}_{3}$Bi(SeO${}_{3}$)${}_{2}$O${}_{2}$Cl

Infrared phonon anomaly and magnetic excitations in single-crystal Cu $_{3}$ Bi(SeO $_{3}$ ) $_{2}$ O $_{2}$ Cl

K. H. Miller, P. W. Stephens, C. Martin, E. Constable, R. A. Lewis, H. Berger, G. L. Carr, and D. B. Tanner

Phys. Rev. B 86, 174104 – Published 8 November 2012

Abstract

Infrared reflection and transmission as a function of temperature have been measured on single crystals of Cu $_{3}$ Bi(SeO $_{3}$ ) $_{2}$ O $_{2}$ Cl. The complex dielectric function and optical properties along all three principal axes of the orthorhombic cell were obtained via Kramers-Kronig analysis and by fits to a Drude-Lorentz model. Below 115 K, 16 additional modes [8(E $∥ \hat{a}$ )+6(E $∥ \hat{b}$ )+2(E $∥ \hat{c}$ )] appear in the phonon spectra; however, powder x-ray diffraction measurements do not detect a new structure at 85 K. Potential explanations for the new phonon modes are discussed. Transmission in the far infrared as a function of temperature has revealed magnetic excitations originating below the magnetic ordering temperature ( $T_{c} \sim 24$ K). The origin of the excitations in the magnetically ordered state will be discussed in terms of their response to different polarizations of incident light, behavior in externally applied magnetic fields, and the anisotropic magnetic properties of Cu $_{3}$ Bi(SeO $_{3}$ ) $_{2}$ O $_{2}$ Cl as determined by dc susceptibility measurements.

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Received 7 June 2012

DOI:https://doi.org/10.1103/PhysRevB.86.174104

Authors & Affiliations

K. H. Miller¹, P. W. Stephens^2,3, C. Martin¹, E. Constable⁴, R. A. Lewis⁴, H. Berger⁵, G. L. Carr³, and D. B. Tanner¹

¹Department of Physics, University of Florida, Gainesville, Florida 32611-8440, USA
²Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794-3800, USA
³Photon Sciences, Brookhaven National Laboratory, Upton, New York 11973, USA
⁴Institute for Superconducting and Electronic Materials, University of Wollongong, New South Wales 2522, Australia
⁵Institute of Physics of Complex Matter, Ecole Polytechnique Federal de Lausanne, CH-1015 Lausanne, Switzerland

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Issue

Vol. 86, Iss. 17 — 1 November 2012

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