Observation of a Saddle-Point Singularity in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Bi</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>0.97</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal"

King, David M.; Shen, Zhi‐Xun; Dessau, D. S.; Marshall, D. S.; Park, C. H.; Spicer, W. E.; Peng, J. L.; Li, Z. Y.; Greene, R. L.

doi:10.1103/physrevlett.73.3298

Cited by 188 publications

(65 citation statements)

References 20 publications

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“…4, and compare it to the Fermi surface of the 2212 compound. The Fermi surface topologies are very similar, and in general agreement with previous studies [4][5][6][7].…”

supporting

confidence: 80%

ARPES studies of Pb substituted Bi2201 compounds

Takeuchi

Ding

Campuzano

et al. 1997

Physica C: Superconductivity

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“…4, and compare it to the Fermi surface of the 2212 compound. The Fermi surface topologies are very similar, and in general agreement with previous studies [4][5][6][7].…”

supporting

confidence: 80%

ARPES studies of Pb substituted Bi2201 compounds

Takeuchi

Ding

Campuzano

et al. 1997

Physica C: Superconductivity

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“…For instance, early photoemission studies have suggested an extended saddle point singularity near the Fermi level [70]. It has been shown that this band structure anomaly leads to a peak in the joint density of states, which in turn produces a peak in the unrenormalized susceptibility χ ′′ 0 [30,46].…”

Section: Discussionmentioning

confidence: 99%

Spin susceptibility in underdopedYBa2Cu3O6+
Fong
¹
,
Bourges
²
,
Sidis
³

et al. 2000
Phys. Rev. B
224
48
364
4
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We report a comprehensive polarized and unpolarized neutron scattering study of the evolution of the dynamical spin susceptibility with temperature and doping in three underdoped single crystals of the YBa2Cu3O6+x high temperature superconductor: YBa2Cu3O6.5 (Tc = 52 K), YBa2Cu3O6.7 (Tc = 67 K), and YBa2Cu3O6.85 (Tc = 87 K). The spin susceptibility is determined in absolute units at excitation energies between 1 and 140 meV and temperatures between 1.5 and 300 K. Polarization analysis is used extensively at low energies. Transitional matrix elements, including those between spin states, in a bilayer system such as YBa2Cu3O6+x can be generally classified into even and odd, according to the sign change under a symmetry operation that exchanges the layers, and both even and odd excitations are detected in YBa2Cu3O6.5 and YBa2Cu3O6.7. While the even spin excitations show a true gap which depends on doping, the odd spectrum is characterized by a weakly dopingdependent pseudogap. Both even and odd components are substantially enhanced upon lowering the temperature from 300 K. The even excitations evolve smoothly through the superconducting transition temperature Tc, but the odd excitations develop a true gap below Tc. At the same time, the odd spin susceptibility is sharply enhanced below Tc around an energy that increases with doping. This anomaly in the magnetic spectrum is closely related to the magnetic resonance peak that appears at 40 meV in the superconducting state of the optimally doped compound (Tc = 93 K). From these data we extract the energy and the energy-integrated spectral weight of the resonance peak in absolute units as a function of doping level. Theoretical implications of these measurements are discussed, and a critique of recent attempts to relate the spin excitations to the thermodynamics of high temperature superconductors is given.

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“…A quantitative explanation for a high value of the Hall density in La 2Ϫx Sr x CuO 4 is proposed compatible with the x scaling of dc conductivity. The doping dependence of T c and of H both in underdoped and overdoped samples, the low-temperature dependence of , R H , and H c2 of overdoped Tl 2 Ba 2 CuO 6 and the robust features of ultrahigh energy resolution angle-resolved photoemission spectra 15,16 ͑ARPES͒ are explained with bipolarons.…”

Section: Introductionmentioning

confidence: 99%

Bipolaron anisotropic flat bands, Hall mobility edge, and metal-semiconductor duality of overdoped high-Tcoxides

1996

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Hole bipolaron band structure with two flat anisotropic bands is derived for oxide superconductors. Strong anisotropy leads to one-dimensional localization in a random field which explains the metal-like value of the Hall effect and the semiconductorlike doping dependence of resistivity of overdoped oxides. Doping dependence of T c and H (0) as well as the low-temperature dependence of resistivity, of the Hall effect, H c2 (T) and robust features of angle-resolved photoemission spectroscopy of several high-T c copper oxides are explained.

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Observation of a Saddle-Point Singularity inBi2(Sr0.97

Cited by 188 publications

References 20 publications

ARPES studies of Pb substituted Bi2201 compounds

ARPES studies of Pb substituted Bi2201 compounds

Spin susceptibility in underdopedYBa2Cu3O6+
Fong
¹
,
Bourges
²
,
Sidis
³

et al. 2000
Phys. Rev. B
224
48
364
4
View full text Add to dashboard Cite

Bipolaron anisotropic flat bands, Hall mobility edge, and metal-semiconductor duality of overdoped high-Tcoxides

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Observation of a Saddle-Point Singularity inBi2(Sr0.97

Cited by 188 publications

References 20 publications

ARPES studies of Pb substituted Bi2201 compounds

ARPES studies of Pb substituted Bi2201 compounds

Spin susceptibility in underdopedYBa2Cu3O6+Fong1, Bourges2, Sidis3 et al. 2000Phys. Rev. B224483644View full textAdd to dashboardCite

Bipolaron anisotropic flat bands, Hall mobility edge, and metal-semiconductor duality of overdoped high-Tcoxides

Contact Info

Product

Resources

About

Spin susceptibility in underdopedYBa2Cu3O6+
Fong
¹
,
Bourges
²
,
Sidis
³

et al. 2000
Phys. Rev. B
224
48
364
4
View full text Add to dashboard Cite