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Infrared phonon anomaly and magnetic excitations in single-crystal Cu3Bi(SeO3)2O2Cl

Journal Article


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Abstract


  • Infrared reflection and transmission as a function of temperature have been measured on single crystals of Cu3Bi(SeO3)2O2Cl. 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 ˆa )+6(E ˆb)+2(E ˆ 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 belowthemagnetic ordering temperature (Tc ∼ 24 K). The origin of the excitations in themagnetically 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 Cu3Bi(SeO3)2O2Cl as determined by dc susceptibility measurements.

Authors


  •   Miller, K H. (external author)
  •   Stephens, P W. (external author)
  •   Martin, C (external author)
  •   Constable, Evan (external author)
  •   Lewis, R A.
  •   Berger, H (external author)
  •   Carr, G L. (external author)
  •   Tanner, D B. (external author)

Publication Date


  • 2012

Citation


  • Miller, K. H., Stephens, P. W., Martin, C., Constable, E., Lewis, R. A., Berger, H., Carr, G. L. & Tanner, D. B. (2012). Infrared phonon anomaly and magnetic excitations in single-crystal Cu3Bi(SeO3)2O2Cl. Physical Review B: Condensed Matter and Materials Physics, 86 (17), 174104-1-174104-11.

Scopus Eid


  • 2-s2.0-84869074759

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=8196&context=engpapers

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/5264

Start Page


  • 174104-1

End Page


  • 174104-11

Volume


  • 86

Issue


  • 17

Place Of Publication


  • http://prb.aps.org/abstract/PRB/v86/i17/e174104

Abstract


  • Infrared reflection and transmission as a function of temperature have been measured on single crystals of Cu3Bi(SeO3)2O2Cl. 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 ˆa )+6(E ˆb)+2(E ˆ 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 belowthemagnetic ordering temperature (Tc ∼ 24 K). The origin of the excitations in themagnetically 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 Cu3Bi(SeO3)2O2Cl as determined by dc susceptibility measurements.

Authors


  •   Miller, K H. (external author)
  •   Stephens, P W. (external author)
  •   Martin, C (external author)
  •   Constable, Evan (external author)
  •   Lewis, R A.
  •   Berger, H (external author)
  •   Carr, G L. (external author)
  •   Tanner, D B. (external author)

Publication Date


  • 2012

Citation


  • Miller, K. H., Stephens, P. W., Martin, C., Constable, E., Lewis, R. A., Berger, H., Carr, G. L. & Tanner, D. B. (2012). Infrared phonon anomaly and magnetic excitations in single-crystal Cu3Bi(SeO3)2O2Cl. Physical Review B: Condensed Matter and Materials Physics, 86 (17), 174104-1-174104-11.

Scopus Eid


  • 2-s2.0-84869074759

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=8196&context=engpapers

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/5264

Start Page


  • 174104-1

End Page


  • 174104-11

Volume


  • 86

Issue


  • 17

Place Of Publication


  • http://prb.aps.org/abstract/PRB/v86/i17/e174104