A study of the magnetic properties of a quasi-one-dimensional magnet β-TeVO4 in the frame of the <i>J</i>1–<i>J</i>2 model

Savina, Yu. O.; Bludov, A. N.; Pashchenko, V. A.; Gnatchenko, S. L.; Savin, Yu V; Schäfer, Steffen; Lemmens, P.; Berger, H.

doi:10.1063/1.4928922

Cited by 8 publications

(6 citation statements)

References 9 publications

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“…Here we focus on β-TeVO 4 , 18,19 which has been recently recognized as a very good realization of a spin-1/2 frustrated ferromagnetic chain. [20][21][22][23] In this compound, the V 4+ (S = 1/2) magnetic ions are coupled by ferromagnetic nearest-neighbor J 1 ≈ −38 K and antiferromagnetic next-nearest-neighbor J 2 ≈ −J 1 exchange interactions mediated by oxygen and oxygen-tellurium-oxygen superexchange pathways, respectively (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

Magnetic ground state of the frustrated spin- 12 chain compound β–TeVO4 at high magnetic fields

et al. 2019

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Frustrated spin-1/2 chains, despite the apparent simplicity, exhibit remarkably rich phase diagram comprising vector-chiral (VC), spin-density-wave (SDW) and multipolar/spin-nematic phases as a function of the magnetic field. Here we report a study of β-TeVO4, an archetype of such compounds, based on magnetization and neutron diffraction measurements up to 25 T. We find the transition from the helical VC ground state to the SDW state at ∼3 T for the magnetic field along the a and c crystal axes, and at ∼9 T for the field along the b axis. The high-field (HF) state, existing above ∼18 T, i.e., above ∼1/2 of the saturated magnetization, is an incommensurate magnetically ordered state and not the spin-nematic state, as theoretically predicted for the isotropic frustrated spin-1/2 chain. The HF state is likely driven by sizable interchain interactions and symmetric intrachain anisotropies uncovered in previous studies. Consequently, the potential existence of the spin nematic phase in β-TeVO4 is limited to a narrow field range, i.e., a few tenths of a tesla bellow the saturation of the magnetization, as also found in other frustrated spin-1/2 chain compounds.

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Section: Introductionmentioning

confidence: 99%

Magnetic ground state of the frustrated spin- 12 chain compound β–TeVO4 at high magnetic fields

et al. 2019

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“…Here we study elementary excitations of the spin-stripe phase in the frustrated spin-1/2 chain compound β-TeVO 4 [17][18][19][20][21][22][23], which contains localized V 4+ (S = 1/2) magnetic moments [19,22]. This intriguing order involves two superimposed orthogonal incommensurate amplitude-modulated magnetic components with slightly different modulation periods (Fig.…”

Section: Introductionmentioning

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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“…Recently, Saúl and Radtke [16] performed a microscopic analysis of isotropic exchange couplings and concluded that β-TeVO 4 is a good realization of the J 1 − J 2 chain model with ferromagnetic (FM) J 1 and antiferromagnetic (AFM) J 2 . Subsequently, magnetic susceptibility of β-TeVO 4 was re-analyzed in the framework of the J 1 − J 2 model [17]. Gnezdilov et al [18] reported non-monotonic evolution of phonon frequencies and speculated on possible structural changes around 150 K and even on a change in the orbital state of V 4+ at low temperatures.…”

Section: Introductionmentioning

confidence: 99%

Magnetic anisotropy in the frustrated spin-chain compoundβ−TeVO4

et al. 2016

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Isotropic and anisotropic magnetic behavior of the frustrated spin chain compound β-TeVO4 is reported. Three magnetic transitions observed in zero magnetic field are tracked in fields applied along different crystallographic directions using magnetization, heat capacity, and magnetostriction measurements. Qualitatively different temperature-field diagrams are obtained below 10 T for the field applied along a or b and along c, respectively. In contrast, a nearly isotropic high-field phase emerges above 18 T and persists up to the saturation that occurs around 22.5 T. Upon cooling in low fields, the transitions at TN1 and TN2 toward the spin-density-wave and stripe phases are of the second order, whereas the transition at TN3 toward the helical state is of the first order and entails a lattice component. Our microscopic analysis identifies frustrated J1 − J2 spin chains with a sizable antiferromagnetic interchain coupling in the bc plane and ferromagnetic couplings along the a direction. The competition between these ferromagnetic interchain couplings and the helical order within the chain underlies the incommensurate order along the a-direction, as observed experimentally. While a helical state is triggered by the competition between J1 and J2 within the chain, the plane of the helix is not uniquely defined because of competing magnetic anisotropies. Using high-resolution synchrotron diffraction and 125 Te nuclear magnetic resonance, we also demonstrate that the crystal structure of β-TeVO4 does not change down to 10 K, and the orbital state of V 4+ is preserved.

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A study of the magnetic properties of a quasi-one-dimensional magnet β-TeVO4 in the frame of the J1–J2 model

Cited by 8 publications

References 9 publications

Magnetic ground state of the frustrated spin- 12 chain compound β–TeVO4 at high magnetic fields

Magnetic ground state of the frustrated spin- 12 chain compound β–TeVO4 at high magnetic fields

Elementary excitation in the spin-stripe phase in quantum chains

Magnetic anisotropy in the frustrated spin-chain compoundβ−TeVO4

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