Origin of hour-glass magnetic dispersion in underdoped cuprate superconductors

Kharkov, Yaroslav A.; Sushkov, O. P.

doi:10.1103/physrevb.100.224510

Cited by 4 publications

(1 citation statement)

References 43 publications

(92 reference statements)

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“…Meanwhile, in the La214 system, the origin of entire magnetic excitations are discussed in terms of localized spin and charge stripes because the one-dimensionally aligned spin and charge domains are statically stabilized around x = 1/8. 10) Several theoretical models, including not only the stripe (ladder) model, 11,12) but also the spiral, 13) Lifshitz spin liquid, 14) and Fermi surface nesting models 15,16) have been proposed to reproduce hourglass-shaped excitations. However, owing to the insufficient experimental resolution and the intensity * fujita@imr.tohoku.ac.jp of the neutron beam in earlier measurements, the determination of adequate models from the observed fuzzy spectra was difficult.…”

Section: Introductionmentioning

confidence: 99%

Coexistence of Two Components in Magnetic Excitations of La$_{2-x}$Sr$_x$CuO$_4$ ($x$ = 0.10 and 0.16)

Sato,

Ikeuchi,

Kajimoto

et al. 2020

Preprint

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To elucidate the spin dynamics of La 2−x Sr x CuO 4 , which couples with the charge degree of freedom, the spin excitations spanning the characteristic energy (E cross ∼35-40 meV) are investigated for underdoped x = 0.10 and optimally doped (OP) x = 0.16 through inelastic neutron scattering measurements. Analysis based on two-component picture of high-quality data clarified the possible coexistence of uprightly standing incommensurate (IC) excitations with gapless commensurate (C) excitations in the energy-momentum space. The IC component weakens the intensity toward E cross with increasing energy transfer ( ω), whereas the C component strengthens at high-ω regions. The analysis results imply that the superposition of two components with a particular intensity balance forms an hourglass-shaped excitation in appearance. Furthermore, the temperature dependence of the intensity of each component exhibits different behaviors; the IC component disappears near the pseudo-gap temperature (T *) upon warming, whereas the C component is robust against temperature. These results suggest the itinerant electron spin nature and the localized magnetism of the parent La 2 CuO 4 in IC and C excitations, respectively, similar to the spin excitations in the OP YBa 2 Cu 3 O 6+δ and HgBa 2 CuO 4+δ with higher superconducting-transition temperatures.

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Section: Introductionmentioning

confidence: 99%

Coexistence of Two Components in Magnetic Excitations of La$_{2-x}$Sr$_x$CuO$_4$ ($x$ = 0.10 and 0.16)

Sato,

Ikeuchi,

Kajimoto

et al. 2020

Preprint

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Superconductivity in high-Tc and related strongly correlated systems from variational perspective: Beyond mean field theory

et al. 2022

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Quantum Lifshitz criticality in a frustrated two-dimensional XY model

2020

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Antiferromagnetic quantum spin systems can exhibit a transition between collinear and spiral ground states, driven by frustration. Classically this is a smooth crossover and the crossover point is termed a Lifshitz point. Quantum fluctuations change the nature of the transition. In particular it has been argued previously that in the two-dimensional (2D) case a spin liquid (SL) state is developed in the vicinity of the Lifshitz point, termed a Lifshitz SL. In the present work, using a field theory approach, we solve the Lifshitz quantum phase transition problem for the 2D frustrated XY-model. Specifically, we show that, unlike the SU(2) symmetric Lifshitz case, in the XY-model the SL exists only at the critical point. At zero temperature we calculate nonuniversal critical exponents in the Néel and in the spin spiral state and relate these to properties of the SL. We also solve the transition problem at a finite temperature and discuss the role of topological excitations.

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Origin of hour-glass magnetic dispersion in underdoped cuprate superconductors

Cited by 4 publications

References 43 publications

Coexistence of Two Components in Magnetic Excitations of La$_{2-x}$Sr$_x$CuO$_4$ ($x$ = 0.10 and 0.16)

Coexistence of Two Components in Magnetic Excitations of La$_{2-x}$Sr$_x$CuO$_4$ ($x$ = 0.10 and 0.16)

Superconductivity in high-Tc and related strongly correlated systems from variational perspective: Beyond mean field theory

Quantum Lifshitz criticality in a frustrated two-dimensional XY model

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