Structural dimerization in the commensurate magnetic phases of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>Na</mml:mi><mml:mi>Fe</mml:mi><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:msub><mml:mi>WO</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:mo>)</mml:mo></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>Mn</mml:mi><mml:msub><mml:mi>WO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math

Biesenkamp, S.; Qureshi, N.; Sidis, Y.; Becker, Petra; Bohatý, L.; Braden, M.

doi:10.1103/physrevb.102.144429

Cited by 6 publications

(6 citation statements)

References 46 publications

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“…The a, c principal axis of the spiral is now almost parallel to the propagation vector (2°). The averaged magnetic moment of the elliptical spiral amounts to 5.09 (11) µ B in perfect agreement with the Fe 3+ spin moment of S=5/2. Both magnetic structures are visualized in Fig.…”

Section: E Magnetic Structure Of Phase Ic1 and Ic2supporting

confidence: 64%

“…Many multiferroic materials exhibit additional phase transitions at low temperature either due to other magnetic constituents or due to locking into a commensurate phase. Anharmonic modulations of the spiral structure also cause sizable magnetoelastic coupling, which is different to the multiferroic one and which can lead to anomalous relaxation behavior of multiferroic domains [10,11]. Beside the demand for higher transi-tion temperatures and larger ferroelectric polarization it is also necessary to find multiferroic materials exhibiting simpler phase diagrams in order to analyze and describe multiferroic domain dynamics.…”

Section: Introductionmentioning

confidence: 99%

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Single-crystal investigations on the multiferroic material LiFe(WO$_4$)$_2$

Biesenkamp,

Gorkov,

Brüning

et al. 2021

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The crystal and magnetic structure of multiferroic LiFe(WO4)2 were investigated by temperature and magnetic-field dependent specific heat, susceptibility and neutron diffraction experiments on single crystals. Considering only the two nearest-neighbour magnetic interactions, the system forms a J1, J2 magnetic chain but more extended interactions are sizeable. Two different magnetic phases exhibiting long-range incommensurate order evolve at TN1 ≈ 22.2 K and TN2 ≈ 19 K. First, a spin-density wave develops with moments lying in the ac plane. In its multiferroic phase below TN2, LiFe(WO4)2 exhibits a spiral arrangement with an additional spin-component along b. Therefore, the inverse Dzyaloshinskii-Moriya mechanism fully explains the multiferroic behavior in this material. A partially unbalanced multiferroic domain distribution was observed even in the absence of an applied electric field. For both phases only a slight temperature dependence of the incommensurability was observed and there is no commensurate phase emerging at low temperature or at finite magnetic fields up to 6 T. LiFe(WO4)2 thus exhibits a simple phase diagram with the typical sequence of transitions for a type-II multiferroic material.

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Section: E Magnetic Structure Of Phase Ic1 and Ic2supporting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Single-crystal investigations on the multiferroic material LiFe(WO$_4$)$_2$

Biesenkamp,

Gorkov,

Brüning

et al. 2021

Preprint

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“…The relaxation behavior in both systems differs significantly as a function of temperature and electric-field amplitude [18][19][20]. In MnWO 4 domain inversion speeds up, when cooling towards the lower commensurate magnetic phase [18,19], which is attributed to depinning of multiferroic domains by anharmonic modulations [22,23]. In TbMnO 3 the domain inversion can be well described by a remarkably simple law combining an Arrhenius-like activated temperature dependence with a field dependence following the Merz law established for ferroelectrics [20].…”

Section: Introductionmentioning

confidence: 90%

“…In contrast to MnWO 4 , the incommensurate long-range order in multiferroic TbMnO 3 does not transform into a commensurate arrangement [24,25] but is only altered through the additional order of Tb 3+ moments [26]. Apparently, competing incommensurate and commensurate ordering significantly influence the relaxation behavior of multiferroic domain inversion and thus complicate its description [23]. Therefore, multiferroic materials with simple phase diagrams are desirable for further investigations of multiferroic domain dynamics.…”

Section: Introductionmentioning

confidence: 99%

Chiral Order and Multiferroic Domain Relaxation in NaFeGe$_2$O$_6$

Biesenkamp,

Gorkov,

Schmidt

et al. 2021

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The magnetic structure and the multiferroic relaxation dynamics of NaFeGe2O6 were studied by neutron scattering on single crystals partially utilizing polarization analysis. In addition to the previously reported transitions, the incommensurate spiral ordering of Fe 3+ moments in the ac plane develops an additional component along the crystallographic b direction below T ≈ 5 K, which coincides with a lock-in of the incommensurate modulation. The quasistatic control of the spin-spiral handedness, respectively of the vector chirality, by external electric fields proves the invertibility of multiferroic domains down to the lowest temperature. Time-resolved measurements of the multiferroic domain inversion in NaFeGe2O6 reveal a simple temperature and electric-field dependence of the multiferroic relaxation that is well described by a combined Arrhenius-Merz relation, as it has been observed for TbMnO3. The maximum speed of domain wall motion is comparable to the spin wave velocity.

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“…The relaxation behavior in both systems differs significantly as a function of temperature and electric-field amplitude [18][19][20]. In MnWO 4 domain inversion speeds up, when cooling towards the lower commensurate magnetic phase [18,21], which is attributed to depinning of multiferroic domains by anharmonic modulations [22,23]. In TbMnO 3 the domain inversion can be well described by a remarkably simple law combining an Arrhenius-type activated temperature dependence with a field dependence following the Merz law established for ferroelectrics [20].…”

Section: Introductionmentioning

confidence: 99%