2014
DOI: 10.1103/physrevb.90.064405
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Influence of nonmagnetic Zn substitution on the lattice and magnetoelectric dynamical properties of the multiferroic material CuO

Abstract: Dynamic magnetoelectric coupling in the improper ferroelectric Cu 1−x Zn x O (x = 0, x = 0.05) was investigated using terahertz time-domain spectroscopy to probe electromagnon and magnon modes. Zinc substitution was found to reduce the antiferromagnetic ordering temperature and widen the multiferroic phase, under the dual influences of spin dilution and a reduction in unit-cell volume. The impact of Zn substitution on lattice dynamics was elucidated by Raman and Fourier-transform spectroscopy, and shell-model … Show more

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Cited by 11 publications
(28 citation statements)
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“…4(a) as ψ in approaches ±90°, where it is close to the [010] direction, Δ α is observed to be negative, corresponding to more transmission in the AF2 phase. This occurs due to the static polarization along [010] in the multiferroic phase altering the absorption of the higher-lying phonon modes 22 .
Figure 4 ( a ) Temperature-induced change in terahertz absorption coefficient, Δ α , versus incident orientation angle ψ in and frequency.
…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…4(a) as ψ in approaches ±90°, where it is close to the [010] direction, Δ α is observed to be negative, corresponding to more transmission in the AF2 phase. This occurs due to the static polarization along [010] in the multiferroic phase altering the absorption of the higher-lying phonon modes 22 .
Figure 4 ( a ) Temperature-induced change in terahertz absorption coefficient, Δ α , versus incident orientation angle ψ in and frequency.
…”
Section: Resultsmentioning
confidence: 99%
“…The method does not rely upon THz waveplates, and is therefore broadband, and does not require wire-grid polarizers, circumventing the problem of their poor extinction ratio. We demonstrate the applicability of this technique by investigating: (i) the finite ellipticity created by a wire-grid polarizer; (ii) the anisotropic behavior of two uniaxial materials, zinc oxide (ZnO) 21 and lanthanum aluminate (LaAlO 3 ) 5 ; and (iii) anisotropy in the refractive index and absorption for the biaxial compound cupric oxide (CuO) 7 , 22 . Rotating the THz polarization state not only allows convenient access to the anisotropic optical properties at cryogenic temperatures or in high magnetic fields, but also ensures that the same area on the sample is probed at each angle, solving both of these issues related to rotating the sample.…”
Section: Introductionmentioning
confidence: 99%
“…The unusually high temperature of the AF2 multiferroic phase has been a strong driving force for experimental and theoretical activity [29,[33][34][35][36][37][38][39][40] on cupric oxide, CuO. In this phase the canted magnetism drives improper ferroelectricity [28,29,[33][34][35][36].…”
Section: Magnetic Properties Of Cuomentioning
confidence: 99%
“…Electromagnons in CuO have been previously characterized by THz time-domain spectroscopy (THz-TDS) 15,[17][18][19] . Reference 15 provides a detailed report of the measurement and analysis of this excitation.…”
Section: Introductionmentioning
confidence: 99%