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Haug, D.; Hinkov, V.; Suchaneck, A.; Inosov, D. S.; Christensen, Niels Bech; Niedermayer, Ch.; Bourges, P.; Sidis, Y.; Park, J. T.; Ivanov, Alexander S.; Lin, C. T.; Mesot, J.; Keimer, B.

doi:10.1103/physrevlett.103.017001

Cited by 116 publications

(156 citation statements)

References 44 publications

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“…Although the exact origin of the cuprate pseudogap is still under much debate, in recent years there are growing evidences that it may represent certain density wave orders, such as charge density wave 10,[14][15][16] or incommensurate antiferromagnetic orders 22,23 . In either case, the FS is already reconstructed in the pseudogap regime and the SC phase develops on the residual FSs at low T. The density wave and SC orders compete for FS sections but may coexist with each other in real space.…”

Section: Discussionmentioning

confidence: 99%

Visualizing the microscopic coexistence of spin density wave and superconductivity in underdoped NaFe1−xCoxAs

et al. 2013

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Although the origin of high temperature superconductivity in the iron pnictides is still under debate, it is widely believed that magnetic interactions or fluctuations have a crucial role in triggering Cooper pairing. A key issue regarding the iron pnictide phase diagram is whether long-range magnetic order can coexist with superconductivity microscopically. Here we use scanning tunnelling microscopy to investigate the local electronic structure of underdoped NaFe 1 À x Co x As near the spin density wave and superconducting phase boundary. Spatially resolved spectroscopy directly reveals both the spin density wave and superconducting gaps at the same atomic location, providing compelling evidence for the microscopic coexistence of the two phases. The strengths of the two orders are shown to anti-correlate with each other, indicating the competition between them. This work implies that Cooper pairing in the iron pnictides can occur when portions of the Fermi surface are already gapped by the spin density wave order.

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Section: Discussionmentioning

confidence: 99%

Visualizing the microscopic coexistence of spin density wave and superconductivity in underdoped NaFe1−xCoxAs

et al. 2013

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“…In these scenarios, it could be argued that neutron scattering and X-ray diffraction experiments have thus far been performed in magnetic fields too weak to suppress superconductivity significantly, although the non-magnetic impurity Zn is more effective at suppressing superconductivity. Magnetic field-dependent neutron scattering experiments find evidence of field dependence in samples YBa 2 Cu 3 O 6+x of composition x = 0.45, where a low-magnetic-field nematic phase (or glassy phase exhibiting twofold symmetry) is found to evolve progressively into a phase closely resembling an incommensurate spin-density wave in fields of about 15 T [101,104], and static magnetic order has been found in YBa 2 Cu 3 O 6.6 doped with 2 per cent Zn [105]. Other possibilities suggested for translational symmetry breaking include dynamic forms of magnetism [110][111][112], a d-density wave [63][64][65][66][67] and a charge-density wave, among others.…”

Section: (B) Possibilities For Translational Symmetry Breakingmentioning

confidence: 99%

“…An incommensurate triplet order parameter is suggested at low dopings in YBa 2 Cu 3 O 6+x (p ≤ 0.085) from neutron scattering experiments that measure spin correlations at wavevectors Q s ≈ (p ± p 4 , p) (and by symmetry Q s ≈ (p, p ± p 4 )) [101][102][103][104][105][106]. This could imply the existence of charge correlations corresponding to four wavevectors Q c = 2Q s , which translated into the first Brillouin zone yield (± p 2 , 0) (and by symmetry (0, ± p 2 )).…”

Section: (B) Possibilities For Translational Symmetry Breakingmentioning

confidence: 99%

Quantum oscillations in the high- T _c cuprates

Sebastian

Harrison

Lonzarich

2011

Phil. Trans. R. Soc. A.

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We review recent progress in the study of quantum oscillations as a tool for uniquely probing low-energy electronic excitations in high-T c cuprate superconductors. Quantum oscillations in the underdoped cuprates reveal that a close correspondence with Landau Fermi-liquid behaviour persists in the accessed regions of the phase diagram, where small pockets are observed. Quantum oscillation results are viewed in the context of momentum-resolved probes such as photoemission, and evidence examined from complementary experiments for potential explanations for the transformation from a large Fermi surface into small sections. Indications from quantum oscillation measurements of a low-energy Fermi surface instability at low dopings under the superconducting dome at the metal-insulator transition are reviewed, and potential implications for enhanced superconducting temperatures are discussed.

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“…This line marks the onset of long-range SDW order. A number of recent experiments [23,24,25] have presented strong evidence for this transition, in both LSCO and YBCO.…”

mentioning

confidence: 99%

Quantum criticality and the phase diagram of the cuprates

Sachdev

2010

Physica C: Superconductivity and its Applications

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I discuss a proposed phase diagram of the cuprate superconductors as a function of temperature, carrier concentration, and a strong magnetic field perpendicular to the layers. I show how the phase diagram gives a unified interpretation of a number of recent experiments. Superconductivity, Tokyo, Sep 7-12, 2009 Keynote talk, 9th International Conference on Materials and Mechanisms of H c2Figure 1: Proposed phase diagram of the cuprates showing the interplay between superconductivity (SC), spin density wave (SDW) order, and Fermi surface configuration as a function of carrier density (x), temperature (T ), and magnetic field (H) perpendicular to the layers. Full lines are thermal or quantum phase transitions, dashed lines are crossovers, and dotted lines are guides to the eye. The phase transitions associated with valence bond solid (VBS) (or "charge") and nematic order are not shown. The superconducting regions are colored pink. We have assumed the absence of interlayer coupling, and so the SDW order is long-ranged only at T = 0: it is present in the regions labeled "SDW" and on the thick orange line for x < x s . In the blue normal regions, the 'pseudogap' is between T c and T * , the 'Strange Metal' has an in-plane resistivity which is measured to be linear in T , and the "Large Fermi surface" has a conventional T 2 resistivity.This brief note contains a summary of the key aspects of the proposed phase diagram of the cuprate superconductors shown in Fig. 1, and the central role played by ideas of quantum criticality. A more detailed discussion can be found in another recent review by the author [1], which also contains more complete citations to the literature. Here, I will focus on the central physical ideas and highlight support from recent experiments.The phase transitions and crossovers in Fig. 1 appear quite intricate. However, they can be understood simply by focusing first on the quantum critical point (QCP) at doping density, x = x m , temperature T = 0, magnetic field H = 0. As indicated in Fig. 1, this quantum critical point is pre-empted by the onset of superconductivity.The QCP at x = x m is a transition between two metallic (hence the subscript m) Fermi liquid phases. At x > x m we have the full symmetry of the square lattice, and a "large" Fermi surface metal consisting of a hole-like Fermi surface enclosing the area 1 + x expected from the Luttinger theorem (this is for hole doping; with electron doping, x, the area enclosed is 1 − x). At x < x m we have the onset of spin density wave (SDW) order, and this breaks apart the large Fermi surface into "small" Fermi pockets. Nevertheless the Luttinger theorem continues to be obeyed, after accounting for the large unit cell created by the SDW order. The ultimate theory of this quantum critical point is not fully understood, despite much theoretical attention [2].Strong evidence for the QCP at x = x m , and its associated T > 0 crossovers comes from recent experiments on Nd-LSCO [3,4]. They detected the crossover between "Strange Metal" and "Fl...

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Magnetic-Field-Enhanced Incommensurate Magnetic Order in the Underdoped High-Temperature SuperconductorYBa2Cu3O6.45

Cited by 116 publications

References 44 publications

Visualizing the microscopic coexistence of spin density wave and superconductivity in underdoped NaFe1−xCoxAs

Visualizing the microscopic coexistence of spin density wave and superconductivity in underdoped NaFe1−xCoxAs

Quantum oscillations in the high- T _c cuprates

Quantum criticality and the phase diagram of the cuprates

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Magnetic-Field-Enhanced Incommensurate Magnetic Order in the Underdoped High-Temperature SuperconductorYBa2Cu3O6.45

Cited by 116 publications

References 44 publications

Visualizing the microscopic coexistence of spin density wave and superconductivity in underdoped NaFe1−xCoxAs

Visualizing the microscopic coexistence of spin density wave and superconductivity in underdoped NaFe1−xCoxAs

Quantum oscillations in the high- T c cuprates

Quantum criticality and the phase diagram of the cuprates

Contact Info

Product

Resources

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Quantum oscillations in the high- T _c cuprates