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Maki, Makoto; Nishizaki, Terukazu; Shibata, Kenji; Kobayashi, Norio

doi:10.1103/physrevb.65.140511

Cited by 28 publications

(24 citation statements)

References 21 publications

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“…Along the b axis, the wavelength b of the observed corrugations is approximately 1.12 nm. As briefly discussed in our previous letter, 13 the value of b becomes shorter with decreasing the oxygen content 7 − ␦, and this phenomenon is well understood by considering the 2k F instability in 1D CuO chains. Charge alignments shown in Fig.…”

Section: Methodsmentioning

confidence: 57%

“…19,20 The energy-resolved charge-density modulations reported through recent scanning tunneling spectroscopy ͑STS͒ measurement are considered as the spatial oscillations of resonance states in terms of the superconducting quasi-particles scattering. 14,21 In our previous paper, 13 we have presented the oxygencontent dependence of charge-modulation wavelengths on the CuO-chain layer, which is in favor of the 2k F -CDW scenario originated in the quasi-1D Fermi surface nesting. However, the observed charge periodicity seem to remain in phase over a few hundred angstroms along the CuO-chain direction ͑i.e., the b direction͒ and over a still shorter distance in the a direction; that is still an open question.…”

Section: Introductionmentioning

confidence: 87%

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Layered charge-density waves with nanoscale coherence inYBa2Cu3O7−δ

et al. 2005

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We have used a scanning tunneling microscope to investigate the electronic state of CuO chains in YBa 2 Cu 3 O 7−␦ . The observed one-dimensional charge modulations form the nanoscale coherent domains, exhibiting an existence of the interchain correlations. For Zn-substituted crystal, the influence of the local destruction of planar superconductivity is not seen. These results are explained in terms of the very short-range charge-density waves formed in a monolayer with the atomic vacancies.

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Section: Methodsmentioning

confidence: 57%

Section: Introductionmentioning

confidence: 87%

Layered charge-density waves with nanoscale coherence inYBa2Cu3O7−δ

et al. 2005

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“…4. Common interpretations of the charge modulations on the chains are Friedel oscillations 103,109 caused by chain defects, and a Peierls-like CDW instability 110 . The correlation length of the Friedel oscillations, being a local perturbation, may not depend strongly on hole doping or ξ b (chain).…”

Section: 102mentioning

confidence: 99%

Competing charge, spin, and superconducting orders in underdopedYBa2Cu3Oy

et al. 2014

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To explore the doping dependence of the recently discovered charge density wave (CDW) order in YBa2Cu3Oy, we present a bulk-sensitive high-energy x-ray study for several oxygen concentrations, including strongly underdoped YBa2Cu3O6.44. Combined with previous data around the so-called 1/8 doping, we show that bulk CDW order exists at least for hole concentrations (p) in the CuO2 planes of 0.078132. This implies that CDW order exists in close vicinity to the quantum critical point for spin density wave (SDW) order. In contrast to the pseudogap temperature T * , the onset temperature of CDW order decreases with underdoping to TCDW ∼ 90 K in YBa2Cu3O6.44. Together with a weakened order parameter this suggests a competition between CDW and SDW orders. In addition, the CDW order in YBa2Cu3O6.44 shows the same type of competition with superconductivity as a function of temperature and magnetic field as samples closer to p = 1/8. At low p the CDW incommensurability continues the previously reported linear increasing trend with underdoping. In the entire doping range the in-plane correlation length of the CDW order in b axis direction depends only very weakly on the hole concentration, and appears independent of the type and correlation length of the oxygen-chain order. The onset temperature of the CDW order is remarkably close to a temperature T † that marks the maximum of 1/(T1T ) in planar 63 Cu NQR/NMR experiments, potentially indicating a response of the spin dynamics to the formation of the CDW. Our discussion of these findings includes a detailed comparison to the charge stripe order in La2−x Bax CuO4.

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“…6 Indeed, charge density modulations along the Cu-O chains have been extensively studied probing cleaved surfaces of Y-123 in direct space with scanning tunneling microscopy. [7][8][9][10][11][12][13][14][15] It has been shown that Y-123 crystals cleave between the CuO chains and the BaO layer, so that the chains turn out to be the nearest to the surface building block. 7,9,10,15 Both the earliest 9 and the most recent studies 14 present a consistent picture of a CDW, appearing as corrugations of the electronic density with a short correlation range of about 40 Å and a period between 9 and 14 Å, depending on the sample stoichiometry.…”

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confidence: 99%

Pseudogap in the chain states of YBa2Cu3O6.6

et al. 2012

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As established by scanning tunneling microscopy (STM) cleaved surfaces of the high temperature superconductor YBa 2 Cu 2 O 7−δ develop charge density wave (CDW) modulations in the one-dimensional (1D) CuO chains. At the same time, no signatures of the CDW have been reported in the spectral function of the chain band previously studied by photoemission. We use soft X-ray angle resolved photoemission (SX-ARPES) to detect a chain-derived surface band that had not been detected in previous work. The 2k F for the new surface band is found to be 0.55 Å −1 , which matches the wave vector of the CDW observed in direct space by STM. This reveals the relevance of the Fermi surface nesting for the formation of CDWs in the CuO chains in YBa 2 Cu 2 O 7−δ . In agreement with the short range nature of the CDW order the newly detected surface band exhibits a pseudogap, whose energy scale also corresponds to that observed by STM. PACS numbers: 71.45.Lr , 74.72.Kf, 79.60.Jv The CuO chain structure in YBa 2 Cu 2 O 7−δ (Y-123) provides a physical realization of a quasi-one-dimensional electronic system with non-vanishing coupling to the CuO 2 bilayers. 1,2 One of the reasons why 1D electronic systems remain in the focus of solid state research is that even weak interactions transform the quasi-particles of Fermi liquid theory into collective excitations of density wave type. [3][4][5] In particular, the peculiar topological structure of the chain Fermi surface (FS) makes this electronic system prone to formation of charge density wave via the Peierls instability. 6 Indeed, charge density modulations along the Cu-O chains have been extensively studied probing cleaved surfaces of Y-123 in direct space with scanning tunneling microscopy. [7][8][9][10][11][12][13][14][15] It has been shown that Y-123 crystals cleave between the CuO chains and the BaO layer, so that the chains turn out to be the nearest to the surface building block. 7,9,10,15 Both the earliest 9 and the most recent studies 14 present a consistent picture of a CDW, appearing as corrugations of the electronic density with a short correlation range of about 40 Å and a period between 9 and 14 Å, depending on the sample stoichiometry.In the case of 2D systems, the effect of CDW on the electronic states in the reciprocal space has been examined in great detail with modern angle resolved spectroscopy, which provides both momentum and energy resolution when measuring the one particle spectral function. Occurrences of the pseudogap for an incommensurate (or short range ordered) state, which finally develops into a true CDW band gap below T CDW , are well documented. [16][17][18][19] In the case of 1D systems other than Y-123, modifications to the spectral function with the onset of the CDW state have been detected as well. 20-22 the emergence of a pseudogap-like state is also expected in theory and can be understood as a result of a fluctuating Peierls order parameter. [23][24][25][26][27] At the same time, despite the abundant evidence for charge modulations in direct spa...

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Electronic structure of the CuO-chain layer inYBa2Cu3O7

Cited by 28 publications

References 21 publications

Layered charge-density waves with nanoscale coherence inYBa2Cu3O7−δ

Layered charge-density waves with nanoscale coherence inYBa2Cu3O7−δ

Competing charge, spin, and superconducting orders in underdopedYBa2Cu3Oy

Pseudogap in the chain states of YBa2Cu3O6.6

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