Giant phonon anomaly associated with superconducting fluctuations in the pseudogap phase of cuprates

Liu, Ye-Hua; Konik, Robert; Rice, T. M.; Zhang, Fuchun

doi:10.1038/ncomms10378

Cited by 18 publications

(14 citation statements)

References 46 publications

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“…Modulation specific competition: The zero-field maximum at T c of the = 1/2 CDW diffraction intensity has previously been the subject of different interpretations [7,22,23]. Our view is that the intensity maximum is the result of phase competition between = 1/2 CDW order and superconductivity.…”

Section: Discussionmentioning

confidence: 95%

Spatially inhomogeneous competition between superconductivity and the charge density wave in YBa2Cu3O6.67

et al. 2020

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The charge density wave in the high-temperature superconductor YBa2Cu3O7−x (YBCO) is now known to have two different ordering tendencies differentiated by their c-axis correlations. These correspond to ferro-(F-CDW) and antiferro-(AF-CDW) couplings between CDW in neighbouring CuO2 bilayers. This discovery has prompted a number of fundamental questions. For example, how does superconductivity adjust to two competing orders and are either of these orders responsible for the electronic reconstruction? Here we use high-energy x-ray diffraction to study YBa2Cu3O6.67 as a function of magnetic field and temperature. We show that regions of the sample with F-CDW correlations suppress superconductivity more strongly than those with AF-CDW correlations. This implies that an inhomogeneous superconducting state exists, in which some regions show a weak or fragile form of superconductivity. By comparison of F-CDW and AF-CDW correlation lengths, it is furthermore concluded that F-CDW ordering is sufficiently long-range to modify the electronic structure. Our study thus suggests that F-CDW correlations have an important impact on superconducting and normal state properties of underdoped YBCO. * S.Hayden@bristol.ac.uk † johan.chang@physik.uzh.ch been realized [11][12][13][14]. These correspond to different ordering patterns along the c-axis [11,12]. Magnetic field (or uniaxial stress) induces an in-phase "ferro-coupled" CDW (F-CDW) along the b-axis [12, 13] on top of the original out-of-phase bi-axial "antiferro-coupled" CDW (AF-CDW) order. Quenched disorder, that in YBCO is naturally introduced through imperfections in the chain layer, may have important implications for the CDW order [13,15,16]. It is believed that disorder locally favors the AF-CDW order and that the evolution of the CDW correlations with magnetic field may be understood as a cross-over transition in which the CDW coupling along the c-axis varies [12,16].More recently, the case where competing tendencies towards CDW and SC order in the presence of topological defects due to quenched disorder and of vortices in the SC state has been considered [15]. It was demonstrated theoretically, that a "fragile" SC state can occur at low temperatures and at high magnetic field. This state is based on regions in which the CDW order is weakened due to defects where locally superconducting halos can form. These regions then can couple to form a state with global SC phase coherence. Given the richness of theoretical possibilities when superconductivity competes with arXiv:1909.09359v1 [cond-mat.supr-con]

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Section: Discussionmentioning

confidence: 95%

Spatially inhomogeneous competition between superconductivity and the charge density wave in YBa2Cu3O6.67

et al. 2020

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“…for YBa 2 Cu 3 O 6+δ [25]. This motivated proposals that non-"214" type cuprates should be understood using different paradigms than those in "214" systems [17,19,25,[51][52][53]. In Fig.…”

Section: Universal Features Of Cdws In Cupratesmentioning

confidence: 95%

Incommensurate Phonon Anomaly and the Nature of Charge Density Waves in Cuprates

et al. 2018

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While charge density wave (CDW) instabilities are ubiquitous to superconducting cuprates, the different ordering wavevectors in various cuprate families have hampered a unified description of the CDW formation mechanism. Here we investigate the temperature dependence of the low energy phonons in the canonical CDW ordered cuprate La1.875Ba0.125CuO4. We discover that the phonon softening wavevector associated with CDW correlations becomes temperature dependent in the hightemperature precursor phase and changes from a wavevector of 0.238 reciprocal space units (r.l.u.) below the ordering transition temperature up to 0.3 r.l.u. at 300 K. This high-temperature behavior shows that "214"-type cuprates can host CDW correlations at a similar wavevector to previously reported CDW correlations in non-"214"-type cuprates such as YBa2Cu3O 6+δ . This indicates that cuprate CDWs may arise from the same underlying instability despite their apparently different low temperature ordering wavevectors. arXiv:1712.04554v2 [cond-mat.supr-con]

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“…The CDW incommensurability in YBCO is 0.3 rather than 1/4 at 1/8 doping (11,12), the CDW ordering seems to compete with SDW ordering (22)(23)(24) and the CDW incommensurability decreases weakly with doping, rather than increasing (16,20,23,24). On this basis, concepts such as nesting and electron-phonon coupling for CDW formation in YBCO, BSCCO, and HBCO were discussed extensively impeding efforts to understand these cuprates using similar mechanism that were discussed for 214 systems (15,20,(25)(26)(27). Here we use new RIXS instrumentation to discover CDW correlations in the high-temperature phase of the canonical stripe-ordered cuprate LBCO 1/8 (10,(28)(29)(30)(31).…”

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High-temperature charge density wave correlations in La _1.875 Ba _0.125 CuO ₄ without spin–charge locking

Miao

Lorenzana

Seibold

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

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Although all superconducting cuprates display charge-ordering tendencies, their low-temperature properties are distinct, impeding efforts to understand the phenomena within a single conceptual framework. While some systems exhibit stripes of charge and spin, with a locked periodicity, others host charge density waves (CDWs) without any obviously related spin order. Here we use resonant inelastic x-ray scattering (RIXS) to follow the evolution of charge correlations in the canonical stripe ordered cuprate La 1.875 Ba 0.125 CuO 4 (LBCO 1/8) across its ordering transition. We find that hightemperature charge correlations are unlocked from the wavevector of the spin correlations, signaling analogies to CDW phases in various other cuprates. This indicates that stripe order at low temperatures is stabilized by the coupling of otherwise independent charge and spin density waves, with important implications for the relation between charge and spin correlations in the cuprates.Charge density waves | Stripes | Superconductivity | Cuprates W hen holes are doped into the Mott insulating parent compounds of the cuprates, multiple competing interactions conspire to form a rich phase diagram. In the underdoped regime, holes can save energy by clustering together on neighboring sites in order to minimize the number of broken magnetic bonds, but by doing so they pay an extra energy cost of the increased inter-site Coulomb repulsion and reduced kinetic energy. Several early theoretical works suggested that frustration between these different ordering tendencies generates an instability towards spin density wave (SDW) order (1-5) and low-energy incommensurate SDW correlations were indeed observed around the same time (6-8). Such considerations were key to the discovery of "stripes" in the La2−x−y(Nd/Eu)y(Sr/Ba)xCuO4 or 214 family of cuprates. These correlations were found to be strongest at a doping level of 1/8 for which static spin and charge order forms at wavevectors related by a factor of two (9, 10). This phase was often conceptualized in terms of a dominant spin degree of freedom, as the underdoped cuprates have a large magnetic energy scale and a relatively small electronic density of states at the Fermi level (1-5). Furthermore, although high-temperature spin correlations were easily seen (7,8,10), directly detecting high-temperature charge correlations proved beyond the sensitivity of standard x-ray and neutron scattering measurements. Most compellingly, charge and spin ordering appeared, until recently, to be absent in cuprates in which there was a low-energy spin gap such as YBa2Cu3O6+x (YBCO), Bi1.5Pb0.5Sr1.54CaCu2O 8+δ (BSCCO2212), and HgBa2CuO 4+δ (HBCO1201), so the discovery of CDW correlations in these systems generated great interest (11)(12)(13)(14)(15)(16)(17)(18)(19). While the similarity of CDW phase diagrams in these materials may indicate a unified CDW mechanism (20, 21), many of the CDW properties reported in these materials were, however, notably different than that in LBCO 1/8. The CDW incommensurability...

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Giant phonon anomaly associated with superconducting fluctuations in the pseudogap phase of cuprates

Cited by 18 publications

References 46 publications

Spatially inhomogeneous competition between superconductivity and the charge density wave in YBa2Cu3O6.67

Spatially inhomogeneous competition between superconductivity and the charge density wave in YBa2Cu3O6.67

Incommensurate Phonon Anomaly and the Nature of Charge Density Waves in Cuprates

High-temperature charge density wave correlations in La _1.875 Ba _0.125 CuO ₄ without spin–charge locking

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Giant phonon anomaly associated with superconducting fluctuations in the pseudogap phase of cuprates

Cited by 18 publications

References 46 publications

Spatially inhomogeneous competition between superconductivity and the charge density wave in YBa2Cu3O6.67

Spatially inhomogeneous competition between superconductivity and the charge density wave in YBa2Cu3O6.67

Incommensurate Phonon Anomaly and the Nature of Charge Density Waves in Cuprates

High-temperature charge density wave correlations in La 1.875 Ba 0.125 CuO 4 without spin–charge locking

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High-temperature charge density wave correlations in La _1.875 Ba _0.125 CuO ₄ without spin–charge locking