Charge Order and Peak-dip-hump Structure in Pseudogap Phase of Cuprate Superconductors

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When the Mott insulating state is suppressed by charge carrier doping, the pseudogap phenomenon emerges, where at the low-temperature limit, superconductivity coexists with some ordered electronic states. Within the framework of the kinetic-energy-driven superconductivity, the nature of the pair-density-wave order in cuprate superconductors is studied by taking into account the pseudogap effect. It is shown that the onset of the pair-density-wave order does not produce an ordered gap, but rather a novel hidden order as a result of the interplay of the charge-density-wave order with superconductivity. As a consequence, this novel hidden pair-density-wave order as a subsidiary order parameter coexists with the charge-density-wave order in the superconducting-state, and is absent from the normal-state.

supporting

confidence: 65%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Hidden Pair-Density-Wave Order in Cuprate Superconductors

Feng

Gao

Liu

et al. 2019

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“…To discuss the correlation between the chargeorder wave vector Q CD and the second-nearest neighbor hopping t , we first need to understand the nature of EFS, which is determined by the poles of the electron Green's function. Within the t-t -J model in the charge-spin separation fermion-spin representation, the electron Green's function of cuprate superconductors in the normal-state has been evaluated in terms of the full charge-spin recombination [17][18][19] , and can be expressed ex-arXiv:1709.03674v1 [cond-mat.supr-con] 12 Sep 2017…”

mentioning

confidence: 99%

Correlation Between Charge Order and Second-Neighbor Hopping in Cuprate Superconductors

Zhao

Mou

Feng

2017

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The correlation between the charge-order wave vector QCD and second-neighbor hopping t in cuprate superconductors is studied based on the t-t -J model. It is shown that the magnitude of the charge-order wave vector QCD increases with the increase of t , and then the experimentally observed differences of the magnitudes of the charge-order wave vector QCD among the different families of cuprate superconductors at the same doping concentration can be attributed to the different values of t .PACS numbers: 71.45. Lr, 71.18.+y, 74.72.Kf, 74.25.Jb, 74.20.Mn The charge-order correlation, as a competing phenomenon to superconductivity, is a common feature of cuprate superconductors 1-9 . In particular, the electron Fermi surface (EFS) measurements in the angleresolved photoemission spectroscopy (ARPES) experiments demonstrated a close connection between the charge-order wave vector Q CD and the wave vector connecting the tips of the Fermi arcs 1,2,6 , which in this case coincide with the hot spots on EFS, providing an evidence that the charge-order correlation is a natural consequence of the EFS instability. However, the magnitudes of the charge-order wave vector Q CD are different for the different families of cuprate superconductors at the same doping concentration 1-9 . In this case, a systematic investigation of the different magnitudes of the charge-order wave vectors among the different families of cuprate superconductors is useful for the understanding of the physical origin of the charge-order formation. Very soon after the discovery of superconductivity in cuprate superconductors, Anderson 10 argued that the essential physics of cuprate superconductors is contained in the t-J model on a square lattice, with t and J that are the nearest-neighbor hopping and nearest-neighbor spin-spin antiferromagnetic exchange, respectively. However, the experimental data detected from various techniques have introduced important constraints on the microscopic model [11][12][13][14][15] . In particular, the early ARPES experiments 13-15 indicated that the electronic structure and the related overall EFS in cuprate superconductors can be properly described only by generalizing the t-J model to include the second-and third-nearest neighbor hopping terms t and t . Furthermore, the experimental analysis 15 also showed that the superconducting transition temperature T c in the different families of cuprate superconductors is strongly correlated with t . However, it has been shown experimentally that the values of t and J are almost common for the different families of cuprate superconductors, and only the values of t and t are different [11][12][13][14][15] . In this case, a question is raised: is there a correlation between the experimentally observed differences of the magnitudes of the charge-order wave vector Q CD among the different families of cuprate superconductors at the same doping concentration and the second-nearest neighbor hopping t .In the recent studies, the nature of the charge-order correlation in cuprate superco...

Lattice, Charge, and Spin Phase Inhomogeneity in Complex-Striped Quantum Matter

Bianconi

Ricci

2016

Lattice, charge and spin phase inhomogeneity in complex striped quantum matter, preface of the special issue for Superstripes 2016 conference, J .Abstract The Superstripes 2016 conference, held on June 23--29, 2016 in the island of Ischia in Italy celebrated the 20th anniversary of this series of conferences. For 20 years structural, electronic, and magnetic phase inhomogeneities in quantum matter have been the scientific focus for a growing physics community interested in complexity in quantum matter. It has been the meeting point for different scientific communities facing the challenging project to unveil the complex space and time landscapes in quantum matter. The interesting spatial inhomogeneity length scale of multiple coexisting phase ranges from atomic to mesoscopic and the time fluctuations are spread over multiple time scales. The response of these materials changes using different experimental techniques with different spatial and time resolution probing different aspects of the quantum complexity.After the discovery of high temperature superconductivity Alex Müller organized two important workshops [1,2] on phase separation and Jahn-Teller polarons in cuprates superconductors bringing together scientists active in these fields.After ten years of research on the physics of cuprate perovskites, together with Alex Muller, we decided to organize the first conference on "Stripes and high temperature superconductivity" which was held in Rome in December 1996 [3]. We invited the most active research groups reporting evidence for strong magnetic interactions resulting in the formation of spin density wave, SDW, in the form of antiferromagnetic stripes intercalated by charge rich stripes observed by neutron diffraction experiments using neutrons emitted by nuclear reactors [5]. These results showed that doped holes get self organized and segregate in stripes in spite of being uniformly distributed. Clearly these results imply an unconventional strongly correlated metallic phase with breakdown of the rigid band model [6][7][8].A.Bianconi, A. Ricci, Lattice, charge and spin phase inhomogeneity in complex striped quantum matter, preface of the special issue for Superstripes 2016 conference, J ). 2 At the same time other researchers investigated copper perovskites developing the new x-ray spectroscopy methods [8-10] using x-ray emitted by large electron storage rings. XANES (x-ray absorption near edge structure) experiments provided evidence for itinerant doped holes in the oxygen 2p orbital symmetry [9]. The EXAFS (extended xray absorption fine structure) experiments reported the evidence of charge density wave, CDW, [10] with associated periodic lattice distortions or orbital density wave giving the formation of nanoscale lattice stripes and nanoscale inhomogeneity [11] in agreement with PDF analysis of neutron scattering data [12] and transport data [13,14]. These data