High-transition-temperature superconductivity in the absence of the magnetic-resonance mode

Hwang, Jungseek; Timusk, T.; Gu, Genda

doi:10.1038/nature02347

Cited by 221 publications

(335 citation statements)

References 32 publications

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“…1f, with the extracted superconducting gap value ∆ = 5.9 ± 0.1 meV and scattering rate Γ TDoS = 2.6 ± 0.1 meV. The Γ TDoS values extracted here are consistent with what has been measured by tunnelling 24 and optics 25 , although previous ARPES-based methods to extract electronic scattering rates relied on EDC or Momentum Distribution Curve (MDC) widths that give values roughly an order of magnitude larger 26 -see, for example, the EDCs of a, which have widths of order 20 meV. This difference arises because Γ TDoS is sensitive only to pair-breaking interactions whereas the EDCs and MDCs are sensitive to all electronic scattering processes (see Supplementary Fig.…”

supporting

confidence: 76%

The origin and non-quasiparticle nature of Fermi arcs in Bi2Sr2CaCu2O8+δ

et al. 2012

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A Fermi arc 1,2 is a disconnected segment of a Fermi surface observed in the pseudogap phase 3,4 of cuprate superconductors. This simple description belies the fundamental inconsistency in the physics of Fermi arcs, specifically that such segments violate the topological integrity of the band 5 . Efforts to resolve this contradiction of experiment and theory have focused on connecting the ends of the Fermi arc back on itself to form a pocket, with limited and controversial success 6-9 . Here we show the Fermi arc, although composed of real spectral weight, lacks the quasiparticles to be a true Fermi surface 5 . To reach this conclusion we developed a new photoemission-based technique that directly probes the interplay of pair-forming and pair-breaking processes with unprecedented precision. We find the spectral weight composing the Fermi arc is shifted from the gap edge to the Fermi energy by pair-breaking processes 10 . Although real, this weight does not form a true Fermi surface, because the quasiparticles, although significantly broadened, remain at the gap edge. This non-quasiparticle weight may account for much of the unexplained behaviour of the pseudogap phase of the cuprates.

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supporting

confidence: 76%

The origin and non-quasiparticle nature of Fermi arcs in Bi2Sr2CaCu2O8+δ

et al. 2012

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“…These kinks have also been linked to maxima in the spin susceptibility [70]. Of course, additional kinks in the electronic dispersion may also arise from the coupling of electrons to bosonic degrees of freedom, such as phonons [71,72] or spin fluctuations [73,74]. Interestingly, recent experiments [75] have found evidence for kinks in Ni (110), which may be due to the electronic mechanism discussed here.…”

Section: Dmft and The Three-peak Structure Of The Spectral Functionmentioning

confidence: 92%

Dynamical Mean-Field Theory

Vollhardt

Byczuk

Kollar

2011

Springer Series in Solid-State Sciences

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Abstract. The dynamical mean-field theory (DMFT) is a widely applicable approximation scheme for the investigation of correlated quantum many-particle systems on a lattice, e.g., electrons in solids and cold atoms in optical lattices. In particular, the combination of the DMFT with conventional methods for the calculation of electronic band structures has led to a powerful numerical approach which allows one to explore the properties of correlated materials. In this introductory article we discuss the foundations of the DMFT, derive the underlying self-consistency equations, and present several applications which have provided important insights into the properties of correlated matter. Motivation Electronic CorrelationsAlready in 1937, at the outset of modern solid state physics, de Boer and Verwey [1] drew attention to the surprising properties of materials with incompletely filled 3d-bands. This observation prompted Mott and Peierls [2] to discuss the interaction between the electrons. Ever since transition metal oxides (TMOs) were investigated intensively [3]. It is now well-known that in many materials with partially filled electron shells, such as the 3d transition metals V and Ni and their oxides, or 4f rare-earth metals such as Ce, electrons occupy narrow orbitals. The spatial confinement enhances the effect of the Coulomb interaction between the electrons, making them "strongly correlated". Correlation effects can lead to profound quantitative and qualitative changes of the physical properties of electronic systems as compared to non-interacting particles. In particular, they often respond very strongly to changes in external parameters. This is expressed by large renormalizations of the response functions of the system, e.g., of the spin susceptibility and the charge compressibility. In particular, the interplay between the spin, charge and orbital degrees of freedom of the correlated d and f electrons and with the lattice degrees of freedom leads to an amazing multitude of ordering phenomena and other fascinating properties, including high temperature superconductivity, colossal magnetoresistance and Mott metal-insulator transitions [3].arXiv:1109.4833v1 [cond-mat.str-el]

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“…Without taking into account the possibility of phase separation, the authors of refs. [80] and [81] argued that the existence of superconductivity at the hole concentration x > p c could rule out a positive role played by the pseudogap state for superconductivity. Our phase separation picture, however, presents a counter-example to this argument and shows that the superconducting state can exist at x > p c with T * representing the onset of an interaction necessary for superconductivity.…”

Section: Phase Diagrams and The Nernst Effect A Phase Diagramsmentioning

confidence: 99%

Condensation, excitation, pairing, and superfluid density in high-T_c superconductors: the magnetic resonance mode as a roton analogue and a possible spin-mediated pairing

Uemura¹

2004

J. Phys.: Condens. Matter

100

123

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To find out a primary determing factor of Tc and a pairing mechanism in high-Tc cuprates, we combine the muon spin relaxation results on ns/m * (superconducting carrier density / effective mass), accumulated over the last 15 years, with the results from neutron and Raman scattering, STM, specific heat, Nernst effect and ARPES measurements. We identify the neutron magnetic resonance mode as an analogue of roton minimum in the superfluid 4 He, and argue that ns/m * and the resonance mode energy ωres play a primary role in determining Tc in the underdoped region. We propose a picture that roton-like excitations in the cuprates appear as a coupled mode, which has the resonance mode for spin and charge responses at different momentum transfers but the same energy transfers, as detected respectively, by the neutron S=1 mode and the Raman S=0 A1g mode. We shall call this as the "hybrid spin/charge roton". After discussing the role of dimensionality in condensation, we propose a generic phase diagram of the cuprates with spatial phase separation in the overdoped region as a special case of the BE-BCS crossover conjecture where the superconducting coupling is lost rapidly in the overdoped region. Using a microscopic model of charge motion resonating with antiferomagnetic spin fluctuations, we propose a possibility that the hybrid spin/charge roton and higher-energy spin fluctuations mediate the superconducting pairing. In this model, the resonance modes can be viewed as a meson-analogue and the "dome" shape of the phase diagram can be understood as a natural consequence of departure from the competing Mott insulator ground state via carrier doping.

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High-transition-temperature superconductivity in the absence of the magnetic-resonance mode

Cited by 221 publications

References 32 publications

The origin and non-quasiparticle nature of Fermi arcs in Bi2Sr2CaCu2O8+δ

The origin and non-quasiparticle nature of Fermi arcs in Bi2Sr2CaCu2O8+δ

Dynamical Mean-Field Theory

Condensation, excitation, pairing, and superfluid density in high-T_c superconductors: the magnetic resonance mode as a roton analogue and a possible spin-mediated pairing

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High-transition-temperature superconductivity in the absence of the magnetic-resonance mode

Cited by 221 publications

References 32 publications

The origin and non-quasiparticle nature of Fermi arcs in Bi2Sr2CaCu2O8+δ

The origin and non-quasiparticle nature of Fermi arcs in Bi2Sr2CaCu2O8+δ

Dynamical Mean-Field Theory

Condensation, excitation, pairing, and superfluid density in high-Tc superconductors: the magnetic resonance mode as a roton analogue and a possible spin-mediated pairing

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Product

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Condensation, excitation, pairing, and superfluid density in high-T_c superconductors: the magnetic resonance mode as a roton analogue and a possible spin-mediated pairing