Spin-wave spectrum of copper metaborate in the commensurate phase

Boehm, Martin; Martynov, S. N.; Roessli, B.; Petrakovskiı̌, G. A.; Kulda, J.

doi:10.1016/s0304-8853(02)00415-8

Cited by 24 publications

(10 citation statements)

References 10 publications

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“…The maximal energy gap between |g ↑ and |g ↓ is 2J, where J denotes the anitiferromagnetic exchange interaction. The observed energy shift of 7.2 meV well agrees with an inelastic neutron scattering study (2J = 7.7 meV) [28]. The spin-flopped state is however a linear combination of various one-magnon states.…”

Section: Single Crystals Of Cubsupporting

confidence: 88%

Gigantic directional asymmetry of luminescence in multiferroicCuB2O4

2016

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We report direction dependent luminescence (DDL), i.e., the asymmetry in the luminescence intensity between the opposite directions of the emission, in multiferroic CuB2O4. Although it is well known that the optical constants can change with the reversal of the propagation direction of light in multiferroic materials, the largest asymmetry in the luminescence intensity was 0.5 % so far. We have performed a measurement of photoluminescence with a He-Ne laser irradiation (633 nm). The luminescence intensity changes by about 70 % with the reversal of the magnetic field due to the interference between the electric dipole and magnetic dipole transitions. We also demonstrate the imaging of the canted antiferromagnetic domain structure of (Cu,Ni)B2O4 by using the large DDL.

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Section: Single Crystals Of Cubsupporting

confidence: 88%

Gigantic directional asymmetry of luminescence in multiferroicCuB2O4

2016

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“…3 Additionally spin-wave calculations starting from this ground state give an excellent agreement with the experiment. 12 We note that admitting small components of Cu͑A͒ spins along the c axis slightly improved the goodness-of-fit values, which suggests that the magnetic moments are not exactly confined to the tetragonal plane. Whereas at Tϭ12 K, the magnetic moment for Cu͑A͒ amounts to Cu(A) ϭ(0.86Ϯ0.01) B , we find that the Cu͑B͒ atoms only have a small magnetic moment, Cu(B) ϭ(0.20 Ϯ0.01) B .…”

Section: A Magnetic Structure In the Commensurate Phasementioning

confidence: 80%

“…In fact the analysis of inelastic neutron diffraction experiments in copper metaborate has shown that the magnetic excitation spectra, taken at Tϭ12 K, are well explained by two independent magnetic sublattices. 12 A strong isotropic antiferromagnetic exchange interaction between nearest Cu͑A͒ moments stabilizes the magnetic ordering of the cage down to T*. On the other hand it appears that the exchange interactions within Cu͑B͒ spins are frustrated which prevents a magnetic ordering above T*.…”

Section: Discussionmentioning

confidence: 99%

Complex magnetic ground state ofCuB2O4

et al. 2003

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The magnetic ground-state of copper metaborate CuB 2 O 4 was investigated with unpolarized and polarized neutron scattering. A phase transition was found at T N ϭ21 K to a commensurate weakly ferromagnetic state followed by a second transition at T*ϭ10 K to an incommensurate magnetic structure. Neutron diffraction revealed a continuously changing magnetic propagation vector below T*, and unusually asymmetric magnetic satellite reflections. Additionally, diffuse scattering is observed in the temperature range 1.5 KрTр30 K. The magnetic structure determined in both phases are shown to be consistent with results of symmetry analysis. In particular, we find that only one of the two inequivalent Cu 2ϩ sublattice fully orders down to the lowest temperature. Our results show that the complex magnetic behavior of copper metaborate is a consequence of mutual interaction between the two Cu 2ϩ sublattices with different ordering temperatures.

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“…The in-plane exchange interaction parameter J is related to the Néel temperature by For (Cu,Ni)B 2 O 4 , T N 21 K and n = 4; thus J 3.62 meV, acceptably close to the value of 3.88 meV obtained from neutron-scattering data. 28 Setting S = 1/2 and g ≈ 2, the energy of the system can be written in terms of the canting angle φ and magnitude of magnetic field H as…”

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Magnetic control of electric polarization in the noncentrosymmetric compound (Cu,Ni)B2O4

et al. 2013

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The weak ferromagnetic moment in Ni-doped CuB 2 O 4 can be rotated by applying an electric field. While this implies spin-driven ferroelectricity, no direct evidence of electric polarization has been reported to date. Here we report the induction and control of polarization in the borate in the presence of an external magnetic field. Applying a magnetic field along the [110] or [110] axis induces electric polarization along the [001] axis. The polarization is reversed by switching the magnetic-field direction between the [110] and [110] axes. The mechanism by which electric polarization emerges can be well explained in the framework of spin-dependent metal-ligand hybridization.

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Spin-wave spectrum of copper metaborate in the commensurate phase

Cited by 24 publications

References 10 publications

Gigantic directional asymmetry of luminescence in multiferroicCuB2O4

Gigantic directional asymmetry of luminescence in multiferroicCuB2O4

Complex magnetic ground state ofCuB2O4

Magnetic control of electric polarization in the noncentrosymmetric compound (Cu,Ni)B2O4

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