Electronic structure and photoemission studies of late transition-metal oxides — Mott insulators and high-temperature superconductors

Shen, Z.‐X.; Dessau, D. S.

doi:10.1016/0370-1573(95)80001-a

Cited by 592 publications

(149 citation statements)

References 259 publications

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“…The peak-dip-hump structure in the antinodal direction (at (π, 0) in the Brillouin zone) has a long history (Dessau et al 1991, Shen and Dessau 1995, and Ding et al 1996. It was interpreted by many to be distinctly related to the coupling to the spin-one resonance seen in inelastic magnetic neutron scattering experiments.…”

Section: Angle Resolved Photoemission Spectroscopymentioning

confidence: 99%

Bosons in high-temperature superconductors: an experimental survey

Ćarbotte¹,

Timusk²,

Hwang³

2011

Rep. Prog. Phys.

116

164

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Abstract. We review a number of experimental techniques that are beginning to reveal fine details of the bosonic spectrum α 2 F (Ω) that dominates the interaction between the quasiparticles in high temperature superconductors. Angle-resolved photo emission (ARPES) shows kinks in electronic dispersion curves at characteristic energies that agree with similar structures in the optical conductivity and tunnelling spectra. Each technique has its advantages. ARPES is momentum resolved and offers independent measurements of the real and imaginary part of the contribution of the bosons to the self energy of the quasiparticles. The optical conductivity can be used on a larger variety of materials and with the use of maximum entropy techniques reveals rich details of the spectra including their evolution with temperature and doping. Scanning tunnelling spectroscopy offers spacial resolution on the unit cell level. We find that together the various spectroscopies, including recent Raman results, are pointing to a unified picture of a broad spectrum of bosonic excitations at high temperature which evolves, as the temperature is lowered into a peak in the 30 to 60 meV region and a featureless high frequency background in most of the materials studied. This behaviour is consistent with the spectrum of spin fluctuations as measured by magnetic neutron scattering. However, there is evidence for a phonon contribution to the bosonic spectrum as well.arXiv:1105.0726v1 [cond-mat.supr-con]

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Section: Angle Resolved Photoemission Spectroscopymentioning

confidence: 99%

Bosons in high-temperature superconductors: an experimental survey

Ćarbotte¹,

Timusk²,

Hwang³

2011

Rep. Prog. Phys.

116

164

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“…The 'pseudogap' is the superconducting energy gap, which seems [16,17] in underdoped materials to persist in a wide range of temperatures above the resistively defined T c . In these materials the superconducting transition corresponds to the onset of long ranged phase coherence [18][19][20].…”

Section: Modelmentioning

confidence: 99%

“…Refs [12,13,17] argue that the combination of a large Γ and an Ω = 0 in the superconducting state but not in the normal state accounts for the peaks observed in photoemission experiments at T < T c but not for T > T c [16,17].…”

Section: Modelmentioning

confidence: 99%

Quantum fluctuations and thec-axis optical conductivity of high-Tcsuperconductors

Ioffe

Millis

2000

Phys. Rev. B

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A theory of the frequency dependence of the interplane conductivity of a strongly anisotropic superconductor is presented. The form of the conductivity is shown to be a sensitive probe of the strength of quantum and thermal fluctuations of the phase of the superconducting order parameter. The temperature dependence of the superfluid stiffness and of the form of the absorbtion at frequencies of the order of twice the superconducting gap is shown to depend on the interplay between superconducting pairing, phase coherence and the mechanism by which electrons are scattered. Measurements of the c-axis conductivity of high-Tc superconductors are interpreted in terms of the theory.

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“…At low temperature, the EDCs clearly show a peak-dip-hump structure, where the peak and the hump would nominally be considered the coherent part (quasiparticle) and 'incoherent' part of the single-particle spectrum respectively, as has been discussed for the spectra of the high-T C cuprate superconductors [9][10][11] . One sees that the near-E F spectral weight diminishes with increasing temperature, whereas the high-binding-energy (>700 meV) part is less affected by temperature.…”

mentioning

confidence: 91%

A local metallic state in globally insulating La1.24Sr1.76Mn2O7 well above the metal–insulator transition

et al. 2007

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The distinction between metals, semiconductors and insulators depends on the behaviour of the electrons nearest the Fermi level E F , which separates the occupied from the unoccupied electron energy levels. For a metal, E F lies in the middle of a band of electronic states, whereas E F in insulators and semiconductors lies in the gap between states. The temperatureinduced transition from a metallic to an insulating state in a solid is generally connected to a vanishing of the low-energy electronic excitations 1 . Here we show the first direct evidence of a counter-example, in which a significant electronic density of states at the Fermi energy exists in the insulating regime. In particular, angle-resolved photoemission data from the colossal magnetoresistive oxide La 1.24 Sr 1.76 Mn 2 O 7 show clear Fermi-edge steps, both below the metal-insulator transition temperature T C , when the sample is globally metallic, and above T C , when it is globally insulating. Further, small amounts of metallic spectral weight survive up to temperatures more than twice T C . Such behaviour may also have close ties to a variety of exotic phenomena in correlated electron systems, including the pseudogap temperature in underdoped cuprates 2 .As shown in Fig. 1a, the colossal magnetoresistive (CMR) oxide La 2−2x Sr 1+2x Mn 2 O 7 (x = 0.36,0.38) shows a metal-insulator transition at a T C just below 130 K, at which point the system also switches from being a ferromagnet (low temperature T) to a paramagnet (high T) 3 . We carried out angle-resolved photoemission spectroscopy (ARPES) experiments on cleaved single crystals of these materials, with an experimental arrangement as described elsewhere 4 . ARPES is an ideal experimental probe of the electronic structure because it gives the momentum-resolved single-particle excitation spectrum. As discussed in ref. 4, the x = 0.36, 0.38 compounds studied here do not contain the lowenergy pseudogap of the x = 0.4 samples 5-8 (see the Methods section for more details on this, the possible issue of surface sensitivity of ARPES and of possible intergrowths at the surface). The much larger metallic spectral weight of these nonpseudogapped compounds also allows us to study the electronic behaviour in greater detail. Although we find only minimal differences between the x = 0.36 and x = 0.38 compounds, all ARPES spectra shown here are from x = 0.38 samples. Figure 1b shows a large-energy-scale experimental picture of a low-temperature d x 2 −y 2 symmetry band taken along the blue cut near the zone boundary, as shown in the inset. We are able to get clean data by isolating the various bilayer-split bands using different photon energies, as described in ref. 4. In particular, in this paper we show only data from the antibonding bilayer-split band, which has Fermi crossings at k x = ±0.17π/a, k y = 0.9π/a, corresponding to the solid Fermi surface of the inset of Fig. 1b. The energy-distribution curves (EDCs) at the Fermi wavevector k F (indicated by the red line in Fig. 1b) taken at a series of temper...

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Electronic structure and photoemission studies of late transition-metal oxides — Mott insulators and high-temperature superconductors

Cited by 592 publications

References 259 publications

Bosons in high-temperature superconductors: an experimental survey

Bosons in high-temperature superconductors: an experimental survey

Quantum fluctuations and thec-axis optical conductivity of high-Tcsuperconductors

A local metallic state in globally insulating La1.24Sr1.76Mn2O7 well above the metal–insulator transition

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