Long-range magnetic ordering in the spin ladder compound LaCu<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>2.5</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>probed by muon-spin relaxation

Kadono, R.; Okajima, H.; Yamashita, A.; Ishii, Keiko; Yokoo, Tetsuya; Akimitsu, Jun; Kobayashi, Naoya; Hiroi, Zenji; Takano, Mikio; Nagamine, K.

doi:10.1103/physrevb.54.r9628

Cited by 42 publications

(12 citation statements)

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“…1. LaCuO 2.5 has also been proposed as a possible realization of a nearly critical system of coupled ladders, 16 with magnetic ordering observed below T N = 125 K by muon spin rotation 17 (µSR) and a much larger intraladder coupling J = 1340 K extracted from magnetic susceptibility data. 11 This has been supported by tight-binding calculations that predict an interladder coupling J = 0.25J, 18 close to the critical value J c = 0.115J found from quantum Monte Carlo calculations of the susceptibility for the proposed three-dimensional (3D) spin ladder system.…”

Section: Introductionmentioning

confidence: 99%

Spin dynamics of coupled spin ladders near quantum criticality in Ba2CuTeO6

et al. 2018

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We report inelastic neutron scattering measurements of the magnetic excitations in Ba2CuTeO6, proposed by ab initio calculations to magnetically realize weakly coupled antiferromagnetic two-leg spin-1 2 ladders. Isolated ladders are expected to have a singlet ground state protected by a spin gap. Ba2CuTeO6 orders magnetically, but with a small Néel temperature relative to the exchange strength, suggesting that the interladder couplings are relatively small and only just able to stabilize magnetic order, placing Ba2CuTeO6 close in parameter space to the critical point separating the gapped phase and Néel order. Through comparison of the observed spin dynamics with linear spin wave theory and quantum Monte Carlo calculations, we propose values for all relevant intra-and interladder exchange parameters, which place the system on the ordered side of the phase diagram in proximity to the critical point. We also compare high field magnetization data with quantum Monte Carlo predictions for the proposed model of coupled ladders. arXiv:1806.04052v2 [cond-mat.str-el] 7 Dec 2018 FIG. 1. (Color online) Schematic phase diagram of two-leg spin-1 2 AFM ladders as a function of the in-plane interladder exchange coupling J [see Fig. 2(b)]. Below a critical coupling J c , the ground state is an overall singlet with a spin gap ∆. The J = 0 state is schematically illustrated in the inset in the strong rung limit (Jrung J leg ), showing the Cu 2+ ions (blue circles) and spin singlet bonds (black ovals). For J > J c , AFM Néel order is expected below a finite temperature TN for nonzero interplane coupling J3D. Ba2CuTeO6 has been proposed to be located close to the quantum critical point, on the ordered side of the phase diagram. 21,22

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Section: Introductionmentioning

confidence: 99%

Spin dynamics of coupled spin ladders near quantum criticality in Ba2CuTeO6

et al. 2018

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“…The spin-ladder behaviour was first described in transition metal oxides (Cu and V) 10,18,19 and copper(II) halides, [20][21][22][23] although some of them like LaCuO 2.5 24,25 and (VO) 2 P 2 O 7 26 were latter not confirmed as real spin-ladders as they undergo ordering transitions at low temperatures. Spin-ladder behaviour based on an organic species was first identified in (DT-TTF) 2 [Au(mnt) 2 ] (1), 27 and its report stimulated the search for other molecule based spin ladder-systems.…”

Section: Realisation Of Spin-laddersmentioning

confidence: 99%

Spin-ladder behaviour in molecular materials

Silva

Almeida

2021

J. Mater. Chem. C

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“…Such a structure is represented in three dimensions by the two-chain ladder compound LaCuO 2.5 . [8] Initial experimental studies gave contradictory results on the nature of the ground state, as static susceptibility measurements [8] suggested a spin liquid state with a spin gap, while nuclear magnetic resonance (NMR) [9] and muon spin resonance (µSR) [10] measurements indicated a transition to a magnetically ordered phase. In a brief study of both electronic and magnetic properties of the material, it was proposed [11] that the conflicting observations could be reconciled if the system was located near the QCP of the transition between the two regimes, and this scenario was supported by detailed numerical simulations performed by Troyer et al [12] In this work we will analyze the properties of the system on both sides of the critical point, employing a mean-field approximation to the bond-operator technique which is generalized to the magnetically ordered regime.…”

Section: Introductionmentioning

confidence: 99%

Dynamical properties of an antiferromagnet near the quantum critical point: Application to LaCuO2.5

Normand

Rice

1997

Physica B: Condensed Matter

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For a system of two-chain spin ladders, the ground state for weak interladder coupling is the spin-liquid state of the isolated ladder, but is an ordered antiferromagnet (AF) for sufficiently large interactions. We generalize the bond-operator mean-field theory to describe both regimes, and to focus on the transition between them. In the AF phase near the quantum critical point (QCP) we find both spin waves and a low-lying but massive amplitude mode which is absent in a conventional AF. The static susceptibility has the form χ(T ) = χ 0 + aT 2 , with χ 0 small for a system near criticality. We consider the dynamical properties to examine novel features due to the presence of the amplitude mode, and compute the dynamic structure factor. LaCuO 2.5 is thought to be such an unconventional AF, whose ordered phase is located very close to the QCP of the transition to the spin liquid. From the Néel temperature we deduce the interladder coupling, the small ordered moment and the gap in the amplitude mode. The dynamical properties unique to near-critical AFs are expected to be observable in LaCuO 2.5 .

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Long-range magnetic ordering in the spin ladder compound LaCuO2.5probed by muon-spin relaxation

Cited by 42 publications

References 12 publications

Spin dynamics of coupled spin ladders near quantum criticality in Ba2CuTeO6

Spin dynamics of coupled spin ladders near quantum criticality in Ba2CuTeO6

Spin-ladder behaviour in molecular materials

Dynamical properties of an antiferromagnet near the quantum critical point: Application to LaCuO2.5

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