Unusual magnetic excitations in the weakly ordered spin-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mfrac><mml:mn>1</mml:mn><mml:mn>2</mml:mn></mml:mfrac></mml:math>chain antiferromagnet<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Sr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>CuO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>: Possible evidence for Goldstone magnon coupled with the amplitude mode

Sergeicheva, E. G.; Sosin, S. S.; Prozorova, L. A.; Gu, Genda; Zaliznyak, Igor

doi:10.1103/physrevb.95.020411

Cited by 11 publications

(22 citation statements)

References 43 publications

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“…when the magnetization is small). Therefore, this interaction cannot explain an unusually strong magnetic field dependence of the magnon gaps in Sr 2 CuO 3 observed by ESR [17], which authors have attributed to magnon interaction with the putative Higgs mode. …”

Section: Discussionmentioning

confidence: 94%

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Heisenberg necklace model in a magnetic field

Tsvelik

Zaliznyak

2016

Phys. Rev. B

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We study the low-energy sector of the Heisenberg Necklace model. Using the field theory methods, we estimate how the coupling of the electronic spins with the paramagnetic Kondo spins affects the overall spins dynamics and evaluate its dependence on a magnetic field. We are motivated by the experimental realizations of the spin-1/2 Heisenberg chains in SrCuO 2 and Sr 2 CuO 3 cuprates, which remain one-dimensional Luttinger liquids down to temperatures much lower than the inchain exchange coupling, J. We consider the perturbation of the energy spectrum caused by the interaction, γ, with nuclear spins (I = 3/2) present on the same sites. We find that the resulting Necklace model has a characteristic energy scale, Λ ∼ J 1/3 (γI) 2/3 , at which the coupling between (nuclear) spins of the necklace and the spins of the Heisenberg chain becomes strong. This energy scale is insensitive to a magnetic field, B. For µ B B > Λ we find two gapless bosonic modes that have different velocities, whose ratio at strong fields approaches a universal number, √ 2 + 1.

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Section: Discussionmentioning

confidence: 94%

“…Recently, a very unusual dependence of the magnon gaps on a magnetic field has been reported in Sr 2 CuO 3 , which was attributed to the interaction with the putative Higgs mode [17]. However, a possibility that it could be explained by the necklace-type coupling to the nuclear, or the impurity spins, has not been considered.…”

Section: Introductionmentioning

confidence: 98%

Heisenberg necklace model in a magnetic field

Tsvelik

Zaliznyak

2016

Phys. Rev. B

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“…The interchain exchange coupling is significantly reduced due to very small orbital overlaps between Cu-O ensembles in the directions perpendicular to the b axis, thus resulting in an almost ideal spin-chain system. It was found that Sr 2 CuO 3 undergoes an ordering transition into a collinear antiferromagnetic state with ordered moments aligned with the b axis at T N = 5.5(1) K (T N J) [7][8][9]. The exchange interaction between two nested collinear spin sublattices on a body-centered lattice is fully frustrated, so that on the mean-field level these two subsystems are exchange decoupled.…”

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confidence: 99%

“…An electron-spin resonance (ESR) study [7] uncovered two different types of magnetic excitations in the ordered state of Sr 2 CuO 3 . In addition to conventional pseudo-Goldstone magnons with small gaps induced by weak biaxial anisotropy, a novel spin resonance mode was observed below T N , which was assigned to a specific gapped longitudinal (amplitude) mode.…”

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Unexpected magnetic phase in the weakly ordered spin- 12 chain cuprate Sr2CuO3

et al. 2020

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The magnetic phase diagram of a spin-1 2 chain antiferromagnet Sr 2 CuO 3 is studied by an ultrasound phasesensitive detection technique. The system is in the extreme proximity of the Luttinger-liquid quantum-critical point and we observe an unusually strong effect of magnetic field, which is very weak compared to the in-chain interaction, on the Néel ordering temperature. Inside the ordered phase, we detect an unexpected, field-induced continuous phase transition. The transition is accompanied by softening of magnetic excitation observed by electron-spin resonance, which in previous work [E. G. Sergeicheva et al., Phys. Rev. B 95, 020411(R) ( 2017)] was associated with a longitudinal (amplitude) mode of the order parameter. These results suggest a transition from a transverse collinear antiferromagnet to an amplitude-modulated spin-density-wave phase in a very weak magnetic field, which is unexpected for a system of weakly coupled Heisenberg spin-1 2 chains.

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Magnetic field tuning of quantum spin excitations in a weakly coupled S=12 Heisenberg spin chain as seen from NMR

Wang

et al. 2019

Phys. Rev. B

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We report our NMR study of the spin excitations in the quasi-one dimensional (1D) S = 1/2 quantum magnet CH3NH3Cu(HCOO)3 lying in the 1D-3D dimensional crossover regime with Dzyaloshinskii-Moriya(DM) interactions. Above TN , the spinon excitation is observed from the constant 1/T1 at low temperatures contributed from the staggered spin susceptibility. At low temperatures well below TN , the 1/T1 begins to flatten out under weak magnetic fields. With the increasing field intensity, 1/T1 tends to show a power-law temperature dependence gradually, with the index increasing from zero to ∼ 3, and finally ∼ 5, which are the respective typical characteristic for the dominating two-magnon Raman process and three-magnon scattering contributions to the nuclear relaxation in a conventional 3D magnet. A possible physical mechanism for this novel magnetic field tuning of quantum spin excitations related with the enhanced effective staggered field created by the DM interactions under magnetic field is discussed.

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Unusual magnetic excitations in the weakly ordered spin-12chain antiferromagnetSr2CuO3: Possible evidence for Goldstone magnon coupled with the amplitude mode

Cited by 11 publications

References 43 publications

Heisenberg necklace model in a magnetic field

Heisenberg necklace model in a magnetic field

Unexpected magnetic phase in the weakly ordered spin- 12 chain cuprate Sr2CuO3

Magnetic field tuning of quantum spin excitations in a weakly coupled S=12 Heisenberg spin chain as seen from NMR

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