Triplet Waves in a Quantum Spin Liquid

Xu, Gang; Broholm, C.; Reich, Daniel H.; Adams, Mark A.

doi:10.1103/physrevlett.84.4465

Cited by 96 publications

(148 citation statements)

References 24 publications

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“…1. Strong elastic scattering from incoherent nuclear processes is clearly seen as well as a peak at 0.4 meV as expected for the one magnon mode [10], close to the dimer excitation energy J = 0.45 meV. A second much weaker peak appears at roughly double the dimer energy at about 0.9 meV, which is where two-magnon scattering is expected.…”

Section: Neutron Scattering Measurementsmentioning

confidence: 65%

“…6 is that calculated using the results of [10] and it gives a reasonable account of the data. The small discrepancies from the peak-centers measured here are attributable due to the effects of the instrumental resolution which averages over a large swathe of the interchain dispersion modulation.…”

Section: One-magnon Scatteringmentioning

confidence: 99%

“…The structure of Cu(NO 3 ) 2 · 2.5H 2 O was investigated by Garaj [14] and Morosin [15], and was shown to have a monoclinic crystal structure with space group I12/c1 [16] and the lattice parameters and crystallographic copper positions given in Table II. The deuterated form Cu(NO 3 ) 2 ·2.5D 2 O we studied has low temperature (T = 3 K) lattice parameters a= 16.1, b= 4.9, c = 15.8Å and β = 92.9 • [10].…”

Section: Theorymentioning

confidence: 99%

“…The same high quality sample of copper nitrate used by Xu et al [10] was utilized. This 14.1g sample consists of four coaligned single crystals of CN, with deuterium substituting for 92% of hydrogen.…”

Section: Neutron Scattering Measurementsmentioning

confidence: 99%

“…In this paper we present results from an inelastic neutron scattering study of higher magnetic excitations in copper nitrate (Cu(NO 3 ) 2 · 2.5D 2 O), which was recently confirmed by neutron scattering [10] to be an accurate realization of a strongly alternating Heisenberg antifer-romagnetic chain. This material is especially attractive because the alternation parameter α ≈ 0.27 is close to the value predicted to maximize the separation of the spin-1 two-magnon bound state from the continuum [11].…”

Section: Introductionmentioning

confidence: 99%

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Neutron scattering study of two-magnon states in the quantum magnet copper nitrate

et al. 2003

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We report measurements of the two-magnon states in a dimerized antiferromagnetic chain material, copper nitrate (Cu(NO3)2 · 2.5D2O). Using inelastic neutron scattering we have measured the one and two magnon excitation spectra in a large single crystal. The data are in excellent agreement with a perturbative expansion of the alternating Heisenberg Hamiltonian from the strongly dimerized limit. The expansion predicts a two-magnon bound state for q ∼ (2n + 1)πd which is consistent with the neutron scattering data.

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Section: Neutron Scattering Measurementsmentioning

confidence: 65%

Section: One-magnon Scatteringmentioning

confidence: 99%

Section: Theorymentioning

confidence: 99%

Section: Neutron Scattering Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Neutron scattering study of two-magnon states in the quantum magnet copper nitrate

et al. 2003

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Quantum Magnetic Properties in Perovskite with Anderson Localized Artificial Spin‐1/2

et al. 2018

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Quantum magnetic properties in a geometrically frustrated lattice of spin‐1/2 magnet, such as quantum spin liquid or solid and the associated spin fractionalization, are considered key in developing a new phase of matter. The feasibility of observing the quantum magnetic properties, usually found in geometrically frustrated lattice of spin‐1/2 magnet, in a perovskite material with controlled disorder is demonstrated. It is found that the controlled chemical disorder, due to the chemical substitution of Ru ions by Co‐ions, in a simple perovskite CaRuO3 creates a random prototype configuration of artificial spin‐1/2 that forms dimer pairs between the nearest and further away ions. The localization of the Co impurity in the Ru matrix is analyzed using the Anderson localization formulation. The dimers of artificial spin‐1/2, due to the localization of Co impurities, exhibit singlet‐to‐triplet excitation at low temperature without any ordered spin correlation. The localized gapped excitation evolves into a gapless quasi‐continuum as dimer pairs break and create freely fluctuating fractionalized spins at high temperature. Together, these properties hint at a new quantum magnetic state with strong resemblance to the resonance valence bond system.

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Witnessing Entanglement and Quantum Correlations in Condensed Matter: A Review

Laurell,

Scheie,

Dagotto

et al. 2024

Adv Quantum Tech

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The detection and certification of entanglement and quantum correlations in materials is of fundamental and far‐reaching importance, and has seen significant recent progress. It impacts both the understanding of the basic science of quantum many‐body phenomena as well as the identification of systems suitable for novel technologies. Frameworks suitable to condensed matter that connect measurements to entanglement and coherence have been developed in the context of quantum information theory. These take the form of entanglement witnesses and quantum correlation measures.The underlying theory of these quantities, their relation to condensed matter experimental techniques, and their application to real materials are comprehensively reviewed. In addition, their usage in, e.g., protocols, the relative advantages and disadvantages of witnesses and measures, and future prospects in, e.g., correlated electrons, entanglement dynamics, and entangled spectroscopic probes, are presented. Consideration is given to the interdisciplinary nature of this emerging research and substantial ongoing progress by providing an accessible and practical treatment from fundamentals to application. Particular emphasis is placed on quantities accessible to collective measurements, including by susceptibility and spectroscopic techniques. This includes the magnetic susceptibility witness, one‐tangle, concurrence and two‐tangle, two‐site quantum discord, and quantum coherence measures such as the quantum Fisher information.

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Triplet Waves in a Quantum Spin Liquid

Abstract: We report a neutron scattering study of the spin- 1/2 alternating bond antiferromagnet Cu(NO3)(2);2.5D(2)O for 0.06 Show more

Cited by 96 publications

References 24 publications

Neutron scattering study of two-magnon states in the quantum magnet copper nitrate

Neutron scattering study of two-magnon states in the quantum magnet copper nitrate

Quantum Magnetic Properties in Perovskite with Anderson Localized Artificial Spin‐1/2

Witnessing Entanglement and Quantum Correlations in Condensed Matter: A Review

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