Anomalous Weak Magnetism in Superconducting YBa
 2
 Cu
 3
 O
 
 6+
 x

Sonier, J. E.; Brewer, J. H.; Kiefl, R. F.; Miller, R. I.; Morris, G. D.; Stronach, C. E.; Gardner, J. S.; Dunsiger, S. R.; Bonn, D. A.; Hardy, W. N.; Liang, Ruixing; Heffner, R. H.

doi:10.1126/science.1060844

Cited by 115 publications

(106 citation statements)

References 30 publications

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“…Similar conclusion was reached earlier, using muon spin relaxation experiments, in Ref. [10]. In this Letter, we examine the PKE of the ordered DDW state, and show that it can give rise to a nonzero signal only if there is an admixture of a d xy component to the total order parameter amplitude.…”

supporting

confidence: 86%

Time-Reversal Symmetry Breaking by a (d+id) Density-Wave State in Underdoped Cuprate Superconductors

et al. 2008

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It was proposed that the id x 2 −y 2 density-wave state (DDW) may be responsible for the pseudogap behavior in the underdoped cuprates. Here we show that the admixture of a small dxy component to the DDW state breaks the symmetry between the counter-propagating orbital currents of the DDW state and, thus, violates the macroscopic time-reversal symmetry. This symmetry breaking results in a non-zero polar Kerr effect, which has recently been observed in the pseudogap phase. 74.25.Nf, 71.27.+a Introduction. The nature of the pseudogap in the cuprate high-temperature superconductors is a much-debated and still unresolved issue [1]. Many of the anomalous properties associated with the pseudogap can be best described as resulting from the order parameters [2], such as those of various density-wave states, competing with the d-wave superconductivity. If a density-wave state were to have an energy gap of the d-wave symmetry on the Fermi surface, in conformity with the pseudogap, the natural candidate would be the id x 2 −y 2 density wave (DDW) state. Indeed, much of the phenomenology of the cuprates in the underdoped regime can be unified [3,4,5] by making a single assumption that the ordered DDW state is responsible for the pseudogap. However, the situation is still controversial, because there is no convincing direct experimental evidence for a phase transition to another state in the underdoped regime, besides the antiferromagnetic order close to half-filling.

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confidence: 86%

Time-Reversal Symmetry Breaking by a (d+id) Density-Wave State in Underdoped Cuprate Superconductors

et al. 2008

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“…Such a coexistence appears rather generically in various meanfield treatments of microscopic models of cuprates [5], [6]. Several intriguing recent experiments [7], [8], [9], also suggest the coexistence of the two inimical orderings. If there is a single dSC-SDW quantum phase transition, on the other hand, what should be its universality class?…”

Section: Introductionmentioning

confidence: 82%

Theory of spin response in underdoped cuprates as strongly fluctuatingd-wave superconductors

Herbut

Lee

2003

Phys. Rev. B

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We study the spin dynamics in underdoped cuprates at low temperatures by considering them as quasi two dimensional d-wave superconductors with strong quantum phase fluctuations. An effective theory of spin degrees of freedom of nodal quasiparticles coupled to vortex defects in the phase of the superconducting order parameter is formulated. It represents the minimal extension of the QED3 theory of the pseudogap phase into the superconducting region. The theory predicts a single superconductor-spin density wave (SC-SDW) phase transition, without coexistence between the two phases. At the transition, which may be fluctuation induced first-order, vortices condense (and SC is lost) and the chiral symmetry for fermions simultaneously breaks (and SDW is formed). We compute the spin-spin correlation function in the fluctuating superconducting state, and explain the evolution of the spin response with energy in underdoped Y Ba2Cu3O6+x observed in neutron scattering experiments. In particular, we predict that at very low frequencies ω ∼ (1/10)ωres, with ωres being the energy of the 'resonance' at Q = (π, π), (weak) spin response should become narrowly peaked at four diagonally incommensurate wave vectors that span between the nodes of the superconducting order parameter. These peaks represent the inherent collective mode of the phase fluctuating d-wave superconductor, the condensation of which would bring about the SDW order in the pseudogap phase. Our interpretation of the resonance suggests that it should become more elusive in the superconductors with lower Tc, in accord with its' conspicuous absence in La2−xSrxCuO4.

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“…Experimental evidence has been lacking thus far for a divergent susceptibility characteristic of a proposed QCP under the superconducting dome [88][89][90][91][92][93][94], in part due to the robust superconductivity that obscures any such signatures [95]. While an array of thermodynamic signatures from experiments such as heat capacity, muon spin resonance, neutron scattering and others show a discontinuity above the superconducting dome [96][97][98][99], only a few hints of such a second-order phase transition under the dome have been indicated by the polar Kerr effect in YBa 2 Cu 3 O 6+x in the vicinity of optimal doping [100]. A possible scenario is a secondary symmetry-breaking transition located at the MI QCP that destroys the Fermi surface [20,34], subsequent to a symmetrybreaking transition at optimal doping that reconstructs the Fermi surface.…”

Section: Implications Of Steep Effective Mass Enhancement and Possiblmentioning

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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Anomalous Weak Magnetism in Superconducting YBa ₂ Cu ₃ O _{6+
x}

Cited by 115 publications

References 30 publications

Time-Reversal Symmetry Breaking by a (d+id) Density-Wave State in Underdoped Cuprate Superconductors

Time-Reversal Symmetry Breaking by a (d+id) Density-Wave State in Underdoped Cuprate Superconductors

Theory of spin response in underdoped cuprates as strongly fluctuatingd-wave superconductors

Quantum oscillations in the high- T _c cuprates

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Anomalous Weak Magnetism in Superconducting YBa 2 Cu 3 O 6+ x

Cited by 115 publications

References 30 publications

Time-Reversal Symmetry Breaking by a (d+id) Density-Wave State in Underdoped Cuprate Superconductors

Time-Reversal Symmetry Breaking by a (d+id) Density-Wave State in Underdoped Cuprate Superconductors

Theory of spin response in underdoped cuprates as strongly fluctuatingd-wave superconductors

Quantum oscillations in the high- T c cuprates

Contact Info

Product

Resources

About

Anomalous Weak Magnetism in Superconducting YBa ₂ Cu ₃ O _{6+
x}

Quantum oscillations in the high- T _c cuprates