Fractional Spin Excitations in the Infinite-Layer Cuprate 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>CaCuO</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Martinelli, Leonardo; Betto, Davide; Kummer, K.; Arpaia, Riccardo; Braicovich, L.; Castro, D. Di; Brookes, N. B.; Sala, M. Moretti; Ghiringhelli, G.

doi:10.1103/physrevx.12.021041

Cited by 10 publications

(10 citation statements)

References 66 publications

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“…2 a–c. Consistent with previous reports on CaCuO 2 17 , 18 , a large zone boundary dispersion of the single magnon excitation is observed with an essentially non-dispersive section along the ( h , h ) direction. Away from the Brillouin zone center, the bi-magnon dispersion ℏ ω b m roughly mimics the single magnon dispersion ℏ ω s m .…”

Section: Resultssupporting

confidence: 92%

“…RIXS spectra were acquired in grazing-exit geometry with both linear horizontal ( π ) and linear vertical ( σ ) incident light polarizations with a fixed scattering angle 2 θ = 130 ∘ . The two-dimensional nature of the system ensures that the out-of-plane dependence of the magnon dispersion is negligible, as confirmed in a recent RIXS study on CaCuO 2 18 . The energy resolution, estimated by the full-width-at-half-maximum of the elastic scattering from an amorphous carbon sample, is 118.5 meV at Cu L 3 edge (~931.5 eV).…”

Section: Methodsmentioning

confidence: 64%

“…In fact, the renormalization factor Z c gains its momentum dependence from the higher-order exchange interactions. Enhanced quantum fluctuations may thus introduce new magnetic ground states and with that exotic magnonic quasiparticles 18 , 19 . It is thus interesting to study materials with significant higher-order exchange couplings.…”

Section: Introductionmentioning

confidence: 99%

“…It is thus interesting to study materials with significant higher-order exchange couplings. In the cuprates, A CuO 2 with A = Sr, Ca has been studied with electron spectroscopy and resonant inelastic x-ray scattering (RIXS) 17 , 18 , 20 due to its large ring exchange interaction. Yet, no experiments have demonstrated the importance of magnon-magnon interactions and quantum fluctuations through direct measurements of a momentum dependent magnon renormalization factor.…”

Section: Introductionmentioning

confidence: 99%

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Magnon interactions in a moderately correlated Mott insulator

Wang,

Mustafi,

Fogh

et al. 2024

Nat Commun

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Quantum fluctuations in low-dimensional systems and near quantum phase transitions have significant influences on material properties. Yet, it is difficult to experimentally gauge the strength and importance of quantum fluctuations. Here we provide a resonant inelastic x-ray scattering study of magnon excitations in Mott insulating cuprates. From the thin film of SrCuO2, single- and bi-magnon dispersions are derived. Using an effective Heisenberg Hamiltonian generated from the Hubbard model, we show that the single-magnon dispersion is only described satisfactorily when including significant quantum corrections stemming from magnon-magnon interactions. Comparative results on La2CuO4 indicate that quantum fluctuations are much stronger in SrCuO2 suggesting closer proximity to a magnetic quantum critical point. Monte Carlo calculations reveal that other magnetic orders may compete with the antiferromagnetic Néel order as the ground state. Our results indicate that SrCuO2—due to strong quantum fluctuations—is a unique starting point for the exploration of novel magnetic ground states.

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Section: Resultssupporting

confidence: 92%

Section: Methodsmentioning

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Magnon interactions in a moderately correlated Mott insulator

Wang,

Mustafi,

Fogh

et al. 2024

Nat Commun

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“…In the cuprates, the '(π,0) anomaly' is ubiquitously observed across many different materials 11,[37][38][39][40][41] , and from its isotropic nature the continuum has been interpreted as deconfined fractional quasiparticles (spinons) 11,12 . We note, however, that the T mode still constitutes the dominant part of the total intensity in most cases.…”

Section: Polarization-resolved Resonant Inelastic X-ray Scatteringmentioning

confidence: 99%

Hydrogeochemical anomalies associated with the 2017 MW 5.5 Pohang earthquake in South Korea

Kim¹,

Lee²

2020

Preprint

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The 2017 MW 5.5 Pohang earthquakes, which were known as triggered by enhanced geothermal system (EGS) stimulations, had significant effects on the groundwater system. This study aimed to identify the hydrogeochemical anomalies and to understand the response mechanisms of groundwater system to the earthquake. For this, the environmental isotopes (222Rn, Sr, 2H, and 18O), major ions, and time-series data (groundwater level, temperature, and electrical conductivity) were analyzed. Principal component analysis (PCA) was also employed. The results from time-series data showed the anomalies in the groundwater wells located near the epicenter. The hydrochemical parameters including stable isotopes data of 2H and 18O showed the different change patterns among groundwater wells before/after the earthquakes, which were related to the distance from epicenter, faults, and seawater. The environmental isotopes, radon and strontium, suggested the possible mechanisms underlying the effects of earthquakes by spatial distributions, such as seawater intrusion, water-rock interactions, shallow and deep aquifer mixing, deep fluid upwelling, and bedrock fracture opening. With this, the main cluster of PCA results was also distributed along these isotope concentration gradients. Our findings proved the usefulness of environmental isotopes and hydrogeochemical parameters to understand the earthquake-related changes in groundwater system. These studied parameters and the adopted methods would be positively applied for other earthquake zones.

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