Field-induced States and Excitations in the Quasicritical Spin-
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 Chain Linarite

Cemal, Eron; Enderle, Mechthild; Kremer, Reinhard K.; Fåk, B.; Ressouche, E.; Goff, J. P.; Gvozdikova, M. V.; Zhitomirsky, M. E.; Ziman, T.

doi:10.1103/physrevlett.120.067203

Cited by 18 publications

(47 citation statements)

References 46 publications

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“…In fact, in another frustrated spin-1/2 chain candidate, linarite, 31 already small anisotropies were found to induce a fan-type spin order in applied magnetic field before the complete saturation of the magnetization was reached. 32 The HF state in β-TeVO 4 might, therefore, exhibit a similar kind of a fan order that suppresses the realization of the spin-nematic phase, predicted by the simple isotropic model.…”

Section: Discussionmentioning

confidence: 96%

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: Discussionmentioning

confidence: 96%

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

et al. 2019

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“…Despite that the curves from configuration I and II appear very different at the first glance, they show a number of robust features. These allow us to reproduce the well-known phase boundaries for H b [11,[13][14][15]17].…”

Section: A Torque Curve and The Phase Transitionsmentioning

confidence: 99%

“…The solid lines correspond to the previously published phase diagram [11,14]. Phases are labeled according to [15].…”

Section: A Torque Curve and The Phase Transitionsmentioning

confidence: 99%

“…Magnetic anisotropy certainly plays a role in this material, as evidenced by the dramatic difference in the phase diagrams measured for field applied parallel and perpendicular to the chain axis [13,14]. Anisotropy effects were recently addressed in an experimental and theoretical study [15]. It was shown that the magnetically ordered structures can be understood in terms of mean field model with orthorhombic (biaxial) anisotropy included.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic phase diagram of the strongly frustrated quantum spin chain system PbCuSO4(OH)2 in tilted magnetic fields

Feng¹,

Povarov²,

Zheludev³

2018

Phys. Rev. B

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We report the H−T phase diagram of S = 1/2 strongly frustrated anisotropic spin chain material linarite PbCuSO4(OH)2 in tilted magnetic fields up to 10 T and temperatures down to 0.2 K. By means of torque magnetometry we investigate the phase diagram evolution as the magnetic field undergoes rotation in ba * and bc planes. The key finding is the robustness of the high field spin density wave-like phase, which may persist even as the external field goes orthogonal to the chain direction b. In contrast, the intermediate collinear antiferromagnetic phase collapses at moderate deflection angles with respect to b axis. * povarovk@phys.ethz.ch † http://www.neutron.ethz.ch/ a J 1 J 2

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“…A similar argument can be applied to linarite, PbCu(SO 4 )(OH) 2 , that also features buckled copper chains with an intermediate Cu-Cu distance of 2.823Å. Indeed, its J 1 −8.6 K [68] or −13.8 K [69] is smaller in magnitude than in Li 2 CuO 2 , but still on the ferromagnetic side.…”

Section: Direct Exchangementioning

confidence: 72%

Origin of up-up-down-down magnetic order in Cu2GeO4

2019

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We use density-functional band-structure calculations to explore the origin of the up-up-downdown (UUDD) magnetic order in Cu2GeO4 with the frustrated J1 − J2 spin chains coupled into layers within the spinel-like crystal structure. In contrast to earlier studies, we find that the nearestneighbor coupling J1 may be negligibly small, owing to a nearly perfect compensation of the ferromagnetic direct exchange and antiferromagnetic superexchange. Under this condition, weak symmetric anisotropy of the exchange couplings gives rise to the UUDD order observed experimentally and also elucidates the non-trivial ordering pattern between the layers, whereas a small Dzyaloshinsky-Moriya interaction causes a spin canting that may generate local electric polarization. We argue that the buckling of the copper chains plays a crucial role in the suppression of J1 in Cu2GeO4 and sets this compound apart from other J1 − J2 chain magnets. I. INTRODUCTIONCopper oxides built by chains of edge-sharing CuO 4 plaquettes serve as material prototypes of frustrated spin-1 2 chains with competing nearest-neighbor and nextnearest-neighbor interactions J 1 and J 2 , respectively. This simple spin model received ample attention [1] triggered by the prospects of chiral, multipolar, and spinnematic phases that may occur therein [2][3][4][5][6][7][8]. Whereas long-range order does not take place in one dimension (1D), interchain couplings in real materials will usually cause three-dimensional (3D) collinear or noncollinear order depending on the J 2 /J 1 ratio. On the classical level, incommensurate spiral order appears for J 2 /|J 1 | > 1 4 , whereas at J 2 /|J 1 | < 1 4 the second-neighbor coupling is not strong enough to tilt the spins, and the collinear ferromagnetic or up-down-up-down antiferromagnetic order form depending on the sign of J 1 . Quantum effects preserve the spiral state in the case of ferromagnetic (FM) J 1 [9], but destroy the order and open a spin gap for antiferromagnetic (AFM) J 1 at J 2 /J 1 > 0.241 [10][11][12].Real-world prototypes of the J 1 − J 2 spin chains will typically follow one of these scenarios. The majority of quasi-1D copper oxides reveal J 2 /|J 1 | > 1 4 with FM J 1 and develop the incommensurate spiral order [13][14][15][16]. Li 2 CuO 2 [17,18] and CuAs 2 O 4 [19] are notable exceptions, where J 1 is also FM, but J 2 /|J 1 | < 1 4 renders spin alignment along the chains purely ferromagnetic. Spin-chain compounds with AFM J 1 are more rare, although tentative indications of the spin-gap formation at J 2 /J 1 > 0.241 have been reported [20].One puzzling case in this series is Cu 2 GeO 4 [21] that reveals an unanticipated antiferromagnetic up-up-downdown (UUDD) order [22] despite the prediction of FM J 1 * altsirlin@gmail.com and AFM J 2 , both of the same magnitude [23]. This parameter regime would normally lead to the incommensurate spiral order, similar to LiCuVO 4 , CuCl 2 , and other J 1 − J 2 cuprates. Here, we address this discrepancy and first analyze whether additional terms beyond J 1 and J 2 could...

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Field-induced States and Excitations in the Quasicritical Spin- 1/2 Chain Linarite

Cited by 18 publications

References 46 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

Magnetic phase diagram of the strongly frustrated quantum spin chain system PbCuSO4(OH)2 in tilted magnetic fields

Origin of up-up-down-down magnetic order in Cu2GeO4

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