One-Third Magnetization Plateau with a Preceding Novel Phase in Volborthite

Ishikawa, Hajime; Yoshida, Masahiro; Nawa, K.; Jeong, Minki; Krämer, Steffen; Horvatić, M.; Berthier, C.; Takigawa, Masaharu; Akaki, Mitsuru; Miyake, Atsushi; Tokunaga, Masashi; Kindo, Koichi; Yamaura, Jun‐ichi; Okamoto, Yoshio; Hiroi, Zenji

doi:10.1103/physrevlett.114.227202

Cited by 74 publications

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References 47 publications

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“…In the single crystals, the high-field NMR and magnetization measurements revealed two features remarkably different from those previously observed in the polycrystalline samples; one is the 1/3 magnetization plateau (P state) above 28 T and the other is the novel phase (phase N) at 23-26 T [ Fig. 1(d)] [32].Quite recently, the DFT study of the low temperature structure of P 2 1 /a indicated that the strongest AFM J should lead to an effective model of pseudospin-1/2 on trimers [33]. The other couplings eventually lead to the realization of a spatially anisotropic triangular lattice as shown in Fig.…”

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“…The circles represent the boundaries determined by NMR [32,34]. method described in Refs [31,32]. Because volborthite shows a large sample dependence, we discuss this issue in the Supplemental Material (see Supplemental Materials A, B, and C [34]).…”

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“…The other component has smaller B int and larger 1/T 2 (disorder component). The latter one has a broad Gaussian-like shape, suggesting an inhomogeneous distribution of the internal field due to imperfection of the sample [25,32]. Because the disorder component is nearly absent in crystal A, the crystal must be of higher quality [32].…”

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Spin dynamics in the high-field phases of volborthite

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We report single-crystal 51 V NMR studies on volborthite Cu3V2O7(OH)2·2H2O, which is regarded as a quasi-two-dimensional frustrated magnet with competing ferromagnetic and antiferromagnetic interactions. In the 1/3 magnetization plateau above 28 T, the nuclear spin-lattice relaxation rate 1/T1 indicates an excitation gap with a large effective g factor in the range of 4.6-5.9, pointing to magnon bound states. Below 26 T where the gap has closed, the NMR spectra indicate small internal fields with a Gaussian-like distribution, whereas 1/T1 shows a power-law-like temperature dependence in the paramagnetic state, which resembles a slowing down of spin fluctuations associated with magnetic order. We discuss the possibility of an exotic spin state caused by the condensation of magnon bound states below the magnetization plateau.PACS numbers: 75.30. Kz, 75.40.Gb, The possibilities of exotic states in quantum spin systems with frustrated interactions have attracted strong attention [1,2]. For example, the ground state of the spin-1/2 kagome antiferromagnet is believed to show no long-range magnetic order. Theories have proposed various ground states such as spin liquids [3][4][5] or valencebond-crystal states [6]. Other interesting states such as spin nematic states [7][8][9][10][11] and magnetization plateaus [12][13][14][15][16] are also expected in frustrated spin systems. Theories have predicted that a spin nematic state is realized near a fully polarized state of a frustrated spin system with competing ferromagnetic (FM) interactions J 1 and antiferromagnetic (AFM) interactions J 2 , [7][8][9][10][11]. In such systems, a spin nematic state is characterized by the condensation of two-magnon bound states. The search for a spin nematic phase has been performed by using high-field NMR near the fully polarized state of a quasione-dimensional J 1 -J 2 chain magnet LiCuVO 4 , although definitive results are not obtained yet [17,18].Volborthite Cu 3 V 2 O 7 (OH) 2 ·2H 2 O is a unique antiferromagnet with frustrated interactions [19], which contains layers of distorted kagome nets formed by Cu 2+ ions as shown in Fig. 1(a). Early high-field magnetization and NMR measurements in polycrystalline samples revealed three distinct magnetic phases I (B < 4.5 T), II (4.5 < B < 26 T), and III (26 T < B ) [20][21][22][23][24][25]. The magnetic properties were examined on the basis of the distorted kagome model [25][26][27][28], while the density func- * Present address: Max Plank Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart, Germany tional theory (DFT) study of the C2/m structure proposed that frustration should be attributed to the competition between a FM J 1 and an AFM J 2 between second neighbors along the b axis [ Fig. 1(b)] [29]. Recently, single crystals were prepared and they have provided a further opportunity to study the unique magnetism of volborthite [30,31]. In the single crystals, the high-field NMR and magnetization measurements revealed two features remarkably different from those previou...

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Spin dynamics in the high-field phases of volborthite

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“…In a recent experiment [57], a nonzero κ xy has been observed in a frustrated distorted kagomé volborthite at a strong magnetic field of 15 T with no signs of the DM spin-orbit interaction and no discernible thermal Hall signal was observed at zero magnetic field [58]. The authors attributed the presence of κ xy to nontrivial elementary excitations in the gapless QSL phase, however a strong field of 15 T causes low-temperature magnetic phases in volborthite [26][27][28]. Nevertheless, the exact nature of the low-temperature magnetic phases at 15 T is poorly understood, but the intrinsic DM spinorbit anisotropy suggests a Q = 0 coplanar/noncollinear Néel order.…”

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Topological magnetic excitations on the distorted kagomé antiferromagnets: Applications to volborthite, vesignieite, and edwardsite

Owerre¹

2017

EPL

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In this Letter, we identify a noncoplanar chiral spin texture on the distorted kagomé-lattice antiferromagnets induced by the presence of a magnetic field applied perpendicular to the distorted kagomé plane. The noncoplanar chiral spin texture has a nonzero scalar spin chirality similar to a chiral quantum spin liquid with broken time-reversal symmetry. In the noncoplanar regime we observe nontrivial topological magnetic excitations and thermal Hall response through the emergent field-induced scalar spin chirality in contrast to collinear ferromagnets in which the DzyaloshinskiiMoriya (DM) spin-orbit interaction is the driving force. Our results shed light on recent observation of thermal Hall conductivity in distorted kagomé volborthite at nonzero magnetic field with no signal of DM spin-orbit interaction, and the results also apply to other distorted kagomé antiferromagnets such as vesignieite and edwardsite.

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“…From the experimental point of view, the fractional plateaux have been detected in magnetization curves of a variety of insulating magnetic materials, which mostly provide real-world representatives of zero-dimensional Heisenberg spin clusters 4-10 , one-dimensional Heisenberg spin chains [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] or twodimensional Heisenberg spin lattices [28][29][30][31][32][33][34][35][36] . The fractional magnetization plateaux of onedimensional quantum Heisenberg chains should satisfy the quantization condition p(S u − m u ) ∈ Z (p is a period of the ground state, S u and m u are the total spin and total magnetization per elementary unit, Z is a set of the integer numbers), which has been derived by Oshikawa, Yamanaka, Affleck (OYA) by extending the Lieb-SchultzMattis theorem [37][38][39] .…”

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Fractional magnetization plateaus of the spin-12Heisenberg orthogonal-dimer chain: Strong-coupling approach developed from the exactly solved Ising-Heisenberg model

Verkholyak

Strečka

2016

Phys. Rev. B

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The spin-1/2 Heisenberg orthogonal-dimer chain is considered within the perturbative strongcoupling approach, which is developed from the exactly solved spin-1/2 Ising-Heisenberg orthogonaldimer chain with the Heisenberg intradimer and the Ising interdimer couplings. Although the spin-1/2 Ising-Heisenberg orthogonal-dimer chain exhibits just intermediate plateaux at zero, onequarter and one-half of the saturation magnetization, the perturbative treatment up to second order stemming from this exactly solvable model additionally corroborates the fractional one-third plateau as well as the gapless Luttinger spin-liquid phase. It is evidenced that the approximate results obtained from the strong-coupling approach are in an excellent agreement with the stateof-the-art numerical data obtained for the spin-1/2 Heisenberg orthogonal-dimer chain within the exact diagonalization and density-matrix renormalization group method. The nature of individual quantum ground states is comprehensively studied within the developed perturbation theory.

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One-Third Magnetization Plateau with a Preceding Novel Phase in Volborthite

Cited by 74 publications

References 47 publications

Spin dynamics in the high-field phases of volborthite

Spin dynamics in the high-field phases of volborthite

Topological magnetic excitations on the distorted kagomé antiferromagnets: Applications to volborthite, vesignieite, and edwardsite

Fractional magnetization plateaus of the spin-12Heisenberg orthogonal-dimer chain: Strong-coupling approach developed from the exactly solved Ising-Heisenberg model

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