High field ESR measurements on the chiral spin system CuB<sub>2</sub>O<sub>4</sub>

Fujita, Toshiyuki; Fujimoto, Y.; Mitsudo, S.; Idehara, T.; Inoue, Kazuhide; Kishine, Jun‐ichiro; Kousaka, Yusuke; Yano, Shinichiro; Akimitsu, Jun; Motokawa, M.

doi:10.1088/1742-6596/51/1/024

Cited by 9 publications

(16 citation statements)

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“…Especially, we do not observe any divergence of the dielectric constant. Consequently, we conclude that there is no ferroelectric transition below T N1 contrary to the suggestion of Fujita et al 4 This observation confirms the magnetic structure reported by Boehm et al 5 who reported a transverse spin-density wave below T N1 . Indeed, in light of the recent work of Mostovoy 9 on spiral magnets, the ferroelectricity can arise only if the rotation axis of the spins is perpendicular to the propagation wave vector k. In CuB 2 O 4 , we have k = ͑0,0,k z ͒ with the rotation axis of the spins being the c axis.…”

Section: Dielectric Measurementsupporting

confidence: 85%

“…We measured the various properties along the main crystallographic axes ͑a, b, and c axes of the tetragonal symmetry͒. We show that, in contrary to the suggestion of Fujita et al 4 8 The crystals have bright blueviolet color and a maximum size of 2 ϫ 1 ϫ 1 cm 3 . We oriented and cut several single crystals from the grown boule along the different crystallographic directions.…”

Section: Introductioncontrasting

confidence: 57%

“…In addition, recent high field electron spin resonance ͑ESR͒ experiment suggested the possible presence of ferroelectricity below the incommensurate magnetic transition temperature. 4 This suggestion is supported by the reported polar magnetic phase proposed from a study of CuB 2 O 4 by second harmonic generation. 3 The crystallographic and magnetic structure of CuB 2 O 4 was already investigated by x-ray and neutron diffractions and by specific-heat, magneticsusceptibility, magnetization, and muon-spin-rotation experiments.…”

Section: Introductionmentioning

confidence: 63%

“…[1][2][3][4][5][6] Commensurate and incommensurate magnetic structures as well as frustration have been observed in this compound. Moreover, it has been reported that the Dzyaloshinskii-Moriya interactions 7 lead to the formation of a magnetic soliton lattice in this material.…”

Section: Introductionmentioning

confidence: 70%

“…4 The structural properties of magnetically induced ferroelectrics have been studied in detail. 10 Most of the recent magnetically induced ferroelectrics present magnetoelastic anomalies of the order of 10 −4 at the onset of the ferroelectric phase.…”

Section: B Structural Investigationmentioning

confidence: 99%

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Magnetic, structural, and dielectric properties ofCuB2O4

et al. 2007

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Magnetic, structural, and dielectric properties of CuB (2) Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. We have studied the magnetic, structural, and dielectric properties of a single crystal of CuB 2 O 4 . We show that both reported magnetic transitions are observable in the magnetization, irrespective of the measured direction of the crystal. This is in agreement with recent neutron data. More importantly, our study demonstrates the absence of dielectric anomalies at the various magnetic transitions despite the reported magnetoelectric symmetry. This demonstrates that the polarization remains zero at any temperature. Consequently, we interpret our data as the evidence for a very weak or the absence of linear magnetoelectric coupling in this material.

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Section: Dielectric Measurementsupporting

confidence: 85%

Section: Introductioncontrasting

confidence: 57%

Section: Introductionmentioning

confidence: 63%

Section: Introductionmentioning

confidence: 70%

Section: B Structural Investigationmentioning

confidence: 99%

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Magnetic, structural, and dielectric properties ofCuB2O4

et al. 2007

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Spectroscopic Signature of Spin–Charge–Lattice Coupling in CuB₂O₄

Mero

Lai

et al. 2021

J. Phys. Chem. C

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CuB 2 O 4 has attracted considerable attention because of its unique chemical and physical properties and potential practical applications. In this paper, we investigated the optical properties of CuB 2 O 4 single crystals through spectroscopic ellipsometry and Raman scattering spectroscopy. The optical absorption spectrum at room temperature revealed a direct band gap at approximately 3.88 ± 0.01 eV and two bands near 4.49 and 5.90 eV. The observed bands were related to charge transfer of electrons from the 2p states of the oxygen ions to the 3d states of the copper ions. The band gap exhibited unusual redshift with a decrease in temperature. Upon cooling across 21 K, which is the canted antiferromagnetic ordering temperature, the band gap, peak energy, and normalized intensity of charge-transfer bands presented anomalies. Furthermore, 38 phonon modes were identified in the room-temperature Raman scattering spectrum of CuB 2 O 4 . The phonon modes at approximately 335, 393, 403, 445, 473, 598, 706, 787, and 900 cm −1 exhibited softening below 21 K. The spin−phonon coupling constants were estimated to be 0.02−0.03 cm −1 . These findings highlight a complex nature of spin− charge−lattice interactions in CuB 2 O 4 .

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