Exotic phases of frustrated antiferromagnet 
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Bush, A. A.; Büttgen, N.; Gippius, A. A.; Horvatić, M.; Jeong, Minki; Kraetschmer, W.; Марченко, В. И.; Sakhratov, Yu. A.; Svistov, L. E.

doi:10.1103/physrevb.97.054428

Cited by 13 publications

(9 citation statements)

References 39 publications

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“…The phenomenon is driven by sizable exchange anisotropy, which prevails in a finite temperature range where it stabilizes the dynamical spin-stripe phase that hosts an extraordinary type of excitation, driven by the fourth-order coupling term in the magnetic free energy. Our discovery draws attention to other frustrated spin-1/2 chain compounds with complicated and unresolved magnetic phase diagrams [48,49], where similar effects may be anticipated to play a role. Finally, more details of the wigglon excitation, such as their dependence on the applied magnetic field, should be explored by complementary nuclear-magnetic-resonance measurements that are highly sensitive to spin dynamics in the relevant MHz range even in a sizable applied magnetic field.…”

Section: Discussionmentioning

confidence: 99%

Elementary excitation in the spin-stripe phase in quantum chains

et al. 2019

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Elementary excitations in condensed matter capture the complex many-body dynamics of interacting basic entities in a simple quasiparticle picture. In magnetic systems the most established quasiparticles are magnons, collective excitations that reside in ordered spin structures, and spinons, their fractional counterparts that emerge in disordered, yet correlated spin states. Here we report on the discovery of elementary excitation inherent to spin-stripe order that represents a bound state of two phason quasiparticles, resulting in a wiggling-like motion of the magnetic moments. We observe these excitations, which we dub "wigglons", in the frustrated zigzag spin-1/2 chain compound β-TeVO4, where they give rise to unusual low-frequency spin dynamics in the spin-stripe phase. This provides insights into the stripe physics of strongly-correlated electron systems.

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Section: Discussionmentioning

confidence: 99%

Elementary excitation in the spin-stripe phase in quantum chains

et al. 2019

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“…8b). Intensity distribution between them is very similar to planar cycloid spectra [20][21][22] . Indeed, according to discussion in Section IV, 31 P local fields may form up to four planar cycloids with any possible local field direction within them.…”

Section: Field-sweep 31 P Nmr Of the Fep Single-crystalline Samplementioning

confidence: 57%

“…5) typical for powder samples to asymmetric double-horn shape at high fields (above 4.5 T, left column in Fig. 5) typical for NMR on non-magnetic atoms like Li in single-crystallline helimagnets LiCu 2 O 2 20,21 or Na in NaCu 2 O 2 22 seemingly indicates a spin-reorientation transition in the FeP grains which occur in the range of external fields 3.5 ÷ 4.5 T.…”

Section: Field-sweep 31 P Nmr Of the Fep Powder Samplementioning

confidence: 89%

NMR Analysis of the Magnetic Structure and Hyperfine Interactions in a FeP Binary Helimagnetic

et al. 2019

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We performed a 31 P NMR study of the metallic iron phosphide FeP in zero external magnetic field, as well as by sweeping the externally applied magnetic field H both on powder and single crystalline samples at several fixed frequencies. It was the main goal of our work to determine and explore the field dependent transformation of the magnetically ordered helical structure in FeP: the zero-field NMR spectrum for the polycrystalline sample can be easily explained assuming an incommensurate spiral ordering of Fe magnetic moments with a dominating contribution to the local field at the phosphorus nucleus from the Fe-31 P transferred hyperfine interactions. The components of the transferred hyperfine-interaction tensor were evaluated within a straightforward model approach. The NMR lineshape of the powdered FeP sample gradually changes with increasing field from the trapezoidal-like shape at low fields to a pronounced asymmetric double-horn shape at highest field. The former is typically obtained for powdered samples in applied magnetic fields while the latter is characteristic for the NMR spectra of non-magnetic atoms in single-crystalline helimagnets. The observed transformation of our 31 P NMR spectra of FeP provides strong evidence of the spin-reorientation of the spin-flop type in FeP which occurs in the range of strong external fields 4 < µ0H < 5 T confirmed also by specific-heat measurements. The line pattern of the single-crystal 31 P NMR spectra for external magnetic fields directed within the (ac)-plane exhibit a pronounced four-peak structure characteristic of an incommensurate helimagnetic ground state with two pairs of magnetically inequivalent phosphorus positions. These spectra were successfully simulated assuming a simple planar helix of Fe magnetic moments in the (ab)-plane with a phase shift of 36 degrees between Fe1-Fe3 and Fe2-Fe4 sites according to data from neutron scattering. Rotational single crystal field-sweep NMR experiments were performed both below and above the spin-reorientation transition field at fixed frequencies of νLarmor (31 P) = 33 MHz and 140 MHz, respectively. Theoretical estimations of the transferred hyperfine coupling provide an excellent quantitative description of the observed angular dependences for the experimentally determined field separations between the resonance fields of 31 P in magnetically ordered FeP and the resonance field of free Larmor precession, which serves as the diamagnetic reference field. Rotational single-crystal NMR experiments in high fields reveal an effect of varying phosphorous local fields distribution caused by an iron spin-reorientation transition in high magnetic field.

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“…Действительно, в случае индуцированного спинфлоп-перехода плоскости спирали во всех кристаллических зернах образца переориентируются в направлении внешнего поля и поведение порошкообразного образца в " магнитном отношении" напоминает монокристалл. Хорошо известно, что " двухрожковая" (double-horn) форма сигнала типична для ЯМР на ядрах немагнитных атомов в монокристаллах гелимагнетиков, таких как 6,7 Li в LiCu 2 O 2 [10,11], или 13 Na в NaCu 2 O 2 [12]. В простейшей модели спин-флоп-фазы в FeP предполагается, что магнитные моменты железа в спирали вращаются в плоскости, перпендикулярной внешнему полю H. Однако в этом случае для объяснения симметричной "…”

Section: спектр ямр 31 P в Fep во внешнем полеunclassified

ЯМР-исследование магнитной структуры и сверхтонких взаимодействий в бинарном гелимагнетике FeP

Гиппиус¹,

Журенко²,

Büttgen

et al. 2019

Физика Твердого Тела

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An NMR analysis of ^31P nuclei in metallic iron phosphide FeP has been performed both in a zero field and by sweeping the external magnetic field at several fixed frequencies with the aim of revealing and investigating the transformation of the magnetic helical structure of FeP. The NMR lineshape gradually changes with an increase in the field strength from trapezoidal (in weak fields) to pronounced asymmetric with two peaks (in strong fields). The former shape is typical of NMR spectra of powder samples under an applied magnetic field, while the latter is characteristic of NMR spectra of nonmagnetic atoms in single-crystalline helimagnetics. The observed transformation of the FeP NMR spectrum evidences in favor of the spin-reorientation transition of a spin-flop type in FeP at strong external fields.

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Exotic phases of frustrated antiferromagnet LiCu2O2

Cited by 13 publications

References 39 publications

Elementary excitation in the spin-stripe phase in quantum chains

Elementary excitation in the spin-stripe phase in quantum chains

NMR Analysis of the Magnetic Structure and Hyperfine Interactions in a FeP Binary Helimagnetic

ЯМР-исследование магнитной структуры и сверхтонких взаимодействий в бинарном гелимагнетике FeP

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