Neutron Laue Diffraction Study on the Magnetic Phase Diagram of Multiferroic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>MnWO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>under Pulsed High Magnetic Fields

Nojiri, Hiroyuki; Yoshii, Shunsuke; Yasui, Masato; Okada, Keisuke; Matsuda, M.; Jung, Ji Min; Kimura, T.; Santodonato, Louis J.; Granroth, G. E.; Ross, K. A.; Carlo, J. P.; Gaulin, B. D.

doi:10.1103/physrevlett.106.237202

Cited by 54 publications

(41 citation statements)

References 16 publications

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“…The instrument was operated in Laue mode with an epithermal neutron wavelength band λ = 0.1-0.8Å. The pulsed magnetic field was generated by a solenoid coil, mounted in an insert for a standard 4 He-flow cryostat, and connected to a capacitor bank delivering 4-5 ms pulses and a maximum field of 30 T. This setup 32,33 allows the sample temperature to be controlled by the cryostat, while the solenoid is immersed in liquid nitrogen. A high-quality single crystal (m ≈ 400 mg 29 ) was mounted inside the 12 mm magnet bore with its crystallographic a-axis vertical and the c-axis at an angle θ = 2.8…”

Section: Methodsmentioning

confidence: 99%

“…At 16 T the IC modulation of the spiral locks in to a quintupling of the crystallographic unit cell along b. Pulsed field magnetization measurements at 4.2 K indicate the existence of additional magnetic phase transitions for fields in the range 14 − 22 T. 31 . The ME properties and magnetic structures of the higher-field phases are unknown, but recent advances in pulsed-field diffraction [32][33][34][35] imply that the latter can now be investigated using neutron scattering.…”

Section: 21mentioning

confidence: 99%

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Field-induced reentrant magnetoelectric phase in LiNiPO4

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Section: Methodsmentioning

confidence: 99%

Section: 21mentioning

confidence: 99%

Field-induced reentrant magnetoelectric phase in LiNiPO4

et al. 2017

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“…MnWO 4 , with a frustrated magnetic structure below the Néel temperature of 13.7 K, presents up to three different antiferromagnetic (AF) structures with an incommensurate multiferroic phase (AF2) between 12.7 and 7.6 K [4][5][6][7][8][9][10][11]. Unfortunately, the applicability of the multiferroic properties of MnWO 4 is constrained to the low temperatures at which the magnetic order takes place.…”

Section: Introductionmentioning

confidence: 99%

High-pressure structural phase transition inMnWO4

et al. 2015

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The pressure-induced phase transition of the multiferroic manganese tungstate MnWO 4 is studied on single crystals using synchrotron x-ray diffraction and Raman spectroscopy. We observe the monoclinic P 2/c to triclinic P 1 phase transition at 20.1 GPa and get insight on the phase transition mechanism from the appearance of tilted triclinic domains. Selective Raman spectroscopy experiments with single crystals have shown that the onset of the phase transition occurs 5 GPa below the previously reported pressure obtained from experiments performed with powder samples.

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“…A ferroelectric polarization and thus magnetoelectric multiferroicity is observed in the AF2 phase [7][8][9] as well as in a further phase occurring in high magnetic fields. 11 The spontaneous polarization is parallel to the b axis. 8,9 Ferroelectricity originates from the spiral spin structure via the inverse Dzyaloshinskii-Moriya effect.…”

Section: Introductionmentioning

confidence: 99%

Infrared-active phonon modes in monoclinic multiferroicMnWO4

et al. 2014

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We report on polarized infrared reflectivity measurements of multiferroic, monoclinic MnWO4 between 10 K and 295 K. All five non-vanishing components of the dielectric tensor have been determined in the frequency range of the phonons. All infrared-active phonon modes (7 Au modes and 8 Bu modes) are unambiguously identified. In particular the strongest Bu modes have been overlooked in previous studies, in which the monoclinic symmetry was neglected in the analysis. The combined analysis of reflectance data measured in different experimental geometries (Rac and Rp) is particularly helpful for a proper identification of the Bu modes. Using a generalized Drude-Lorentz model, we determine the temperature dependence of the phonon parameters, including the orientation of the Bu modes within the ac plane. The phonon parameters and their temperature dependence were discussed controversially in previous studies, which did not include a full polarization analysis. Our data do not confirm any of the anomalies reported above 20 K. However, in the paramagnetic phase we find a drastic reduction of the spectral weights of the weakest Au mode and of the weakest Bu mode with increasing temperature. Below 20 K, the parameters of the Au phonon modes for E b show only subtle changes, which demonstrate a finite but weak coupling between lattice dynamics and magnetism in MnWO4. A quantitative comparison of our infrared data with the quasi-static dielectric constant ε b yields a rough estimate for the oscillator strength ∆εem 0.02 of a possible electromagnon for E b. Furthermore, we report on a Kramers-Kronig-consistent model which is able to describe non-Lorentzian line shapes in compounds with monoclinic symmetry.

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Neutron Laue Diffraction Study on the Magnetic Phase Diagram of MultiferroicMnWO4under Pulsed High Magnetic Fields

Cited by 54 publications

References 16 publications

Field-induced reentrant magnetoelectric phase in LiNiPO4

Field-induced reentrant magnetoelectric phase in LiNiPO4

High-pressure structural phase transition inMnWO4

Infrared-active phonon modes in monoclinic multiferroicMnWO4

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