Re-entrant charge order in overdoped (Bi,Pb)2.12Sr1.88CuO6+δ outside the pseudogap regime

Peng, Yingying; Fumagalli, R.; Ding, Ying; Minola, M.; Caprara, S.; Betto, Davide; Bluschke, Martin; Luca, G. M. De; Kummer, K.; Lefrançois, E.; Salluzzo, M.; Suzuki, H.; Tacon, Matthieu Le; Zhou, Xianju; Brookes, N. B.; Keimer, B.; Braicovich, L.; Ghiringhelli, G.

doi:10.1038/s41563-018-0108-3

Cited by 116 publications

(114 citation statements)

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“…Regarding cuprates, polarimetric measurements have confirmed the charge nature of the ordering discovered in the overdoped region of (Bi,Pb) 2 (Sr,La) 2 CuO 6+δ 28 and have clarified the origin of interesting RIXS signals measured in electron doped cuprates: on the one hand they confirmed the charge nature of the zone-center fastdispersing excitations 33,34 in La 2−x Ce x CuO 4 35 , while,on the other, they assigned to spin-excitations the enhanced dynamic response at the charge order wave vector of Nd 2−x Ce x CuO 4 36 . Polarization analysis of the scattered radiation can give valuable insight into the doping evolution of various excitations: both dd and spin excitations get broader upon doping and this analysis can help disentangling contributions overlapping in energy due to their intrinsic width.…”

Section: Introductionmentioning

confidence: 79%

“…RIXS spectra contain a variety of excitations spanning over a wide range of energies, from phonons below 100 meV [13][14][15] , to magnetic excitations up to 500 meV in cuprates 5,6 , to orbital (dd, crystal field) 9,11,[16][17][18][19][20][21][22] and charge transfer [23][24][25][26] excitations in the eV range. Moreover, the elastic and quasi-elastic intensities collected in RIXS spectra carry information on charge density waves or charge orders and associated excitations 10,[27][28][29] .…”

Section: Introductionmentioning

confidence: 99%

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Polarization-resolved Cu L3 -edge resonant inelastic x-ray scattering of orbital and spin excitations in NdBa2Cu3O7−<

et al. 2019

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High resolution resonant inelastic x-ray scattering (RIXS) has proven particularly effective in the determination of crystal field and spin excitations in cuprates. Its strength lies in the large Cu L3 resonance and in the fact that the scattering cross section follows quite closely the single-ion model predictions, both in the insulating parent compounds and in the superconducting doped materials. However, the spectra become increasingly broader with (hole) doping, hence resolving and assigning spectral features has proven challenging even with the highest energy resolution experimentally achievable. Here we have overcome this limitation by measuring the complete polarization dependence of the RIXS spectra as function of momentum transfer and doping in thin films of NdBa2Cu3O 7−δ . Besides confirming the previous assignment of dd and spin excitations (magnon, bimagnon) in the antiferromagnetic insulating parent compound, we unequivocally single out the actual spin-flip contribution at all dopings. We also demonstrate that the softening of dd excitations is mainly attributed to the shift of the xy peak to lower energy loss. These results provide a definitive assessment of the RIXS spectra of cuprates and demonstrate that RIXS measurements with full polarization control are practically feasible and highly informative.

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Section: Introductionmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Polarization-resolved Cu L3 -edge resonant inelastic x-ray scattering of orbital and spin excitations in NdBa2Cu3O7−<

et al. 2019

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“…In particular, recent RXS experiments on overdoped bulk (Bi,Pb) 2.12 Sr 1.88 CuO 6+ δ revealed 2D-CO diffraction features with large in-plane correlation lengths that persist up to at least room temperature 39 . These findings were discussed in terms of enhanced nesting properties of the Fermi surface in proximity to the Lifshitz point, where a 2D van Hove singularity crosses the Fermi level.…”

Section: Discussionmentioning

confidence: 99%

Stabilization of three-dimensional charge order in YBa2Cu3O6+x via epitaxial growth

et al. 2018

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Incommensurate charge order (CO) has been identified as the leading competitor of high-temperature superconductivity in all major families of layered copper oxides, but the perplexing variety of CO states in different cuprates has confounded investigations of its impact on the transport and thermodynamic properties. The three-dimensional (3D) CO observed in YBa2Cu3O6+x in high magnetic fields is of particular interest, because quantum transport measurements have revealed detailed information about the corresponding Fermi surface. Here we use resonant X-ray scattering to demonstrate 3D-CO in underdoped YBa2Cu3O6+x films grown epitaxially on SrTiO3 in the absence of magnetic fields. The resonance profiles indicate that Cu sites in the charge-reservoir layers participate in the CO state, and thus efficiently transmit CO correlations between adjacent CuO2 bilayer units. The results offer fresh perspectives for experiments elucidating the influence of 3D-CO on the electronic properties of cuprates without the need to apply high magnetic fields.

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“…STM [71], NMR [72], x-ray scattering [47,[73][74][75] and ultrafast spectroscopy [48,76] probes. Recent experiments have also revealed charge order in overdoped cuprates [77]. In some cases the peak in the optical conductivity of bad metals continues to exist in underdoped and overdoped samples [21].…”

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confidence: 99%

“…Dips in the low frequency 1/τ(ω) should arise for all of the materials we have been discussing, whose optical conductivity takes the form sketched in figure 1. [77]. In some cases the peak in the optical conductivity of bad metals continues to exist in underdoped and overdoped samples [21].…”

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Bad Metals from Fluctuating Density Waves

et al. 2017

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Bad metals have a large resistivity without being strongly disordered. In many bad metals the Drude peak moves away from zero frequency as the resistivity becomes large at increasing temperatures. We catalogue the position and width of the 'displaced Drude peak' in the observed optical conductivity of several families of bad metals, showing that ω peak ∼ ∆ω ∼ k B T /ħ h. This is the same quantum critical timescale that underpins the T -linear dc resistivity of many of these materials. We provide a unified theoretical description of the optical and dc transport properties of bad metals in terms of the hydrodynamics of short range quantum critical fluctuations of incommensurate density wave order. Within hydrodynamics, pinned translational order is essential to obtain the nonzero frequency peak. Check for updates doi:10.21468/SciPostPhys.3.3.025 Bad metals are defined by the fact that if their electrical resistivity is interpreted within a conventional Drude formalism, the corresponding mean free path of the quasiparticles is so short that the Boltzmann equation underlying Drude theory is not consistent [1][2][3]. As such, bad metals pose a long-standing challenge to theory. In this work we show that the hydrodynamics of phase-fluctuating charge density waves can lead to bad metallic behavior. Hydrodynamics is a tightly constrained formalism for the low energy and long wavelength dynamics of media [4,5]. Non-quasiparticle media, in particular, exhibit fast local thermalization leading to extended hydrodynamics regimes. Phase fluctuations in the density wave can be robustly incorporated into this description and will be essential in order for the states to be metallic, rather than insulating. We will use the hydrodynamic framework to explain observed dc and optical transport behavior that is common to several families of bad metal materials.Recent work has emphasized that the absence of quasiparticles is not sufficient to obtain a bad metal [6]. If the total momentum of the charge carriers is long-lived, then the resistivity will be small even if all single-particle excitations decay rapidly. The importance of the fate of momentum for transport has long been appreciated [7,8], but has acquired renewed relevance 1 SciPost Phys. 3, 025 (2017) in the context of modern unconventional metals, e.g. [9,10]. Two previously considered scenarios for removing the long-lived momentum (sound) mode from the collective description of charge transport are as follows. Firstly, that the low energy, non-quasiparticle, description of bad metals is strongly non-translationally invariant and hence momentum is absent from the hydrodynamic description [6]. Secondly, that an emergent particle-hole symmetry at low energies decouples charge transport from momentum [11]. These mechanisms do not seem to be at work in bad metals. The resistivity of bad metals is not typically strongly dependent on the strength of disorder and some bad metals appear to be relatively clean. Emergent particle-hole symmetry does not decouple momentum ...

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Re-entrant charge order in overdoped (Bi,Pb)2.12Sr1.88CuO6+δ outside the pseudogap regime

Cited by 116 publications

References 54 publications

Polarization-resolved Cu L3 -edge resonant inelastic x-ray scattering of orbital and spin excitations in NdBa2Cu3O7−<

Polarization-resolved Cu L3 -edge resonant inelastic x-ray scattering of orbital and spin excitations in NdBa2Cu3O7−<

Stabilization of three-dimensional charge order in YBa2Cu3O6+x via epitaxial growth

Bad Metals from Fluctuating Density Waves

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