Superconducting electronic state in optimally doped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>YBa</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mtext>Cu</mml:mtext></mml:mrow><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mtext>O</mml:mtext><mml:mrow><mml:mn>7</mml:mn><mml:mo>−</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>observed with laser-excited angle-resolved photoemission spectr

Okawa, Mario; Ishizaka, K.; Uchiyama, Hiroshi; Tadatomo, H.; Masui, T.; Tajima, S.; Wang, X. Y.; Chen, C. T.; Watanabe, S.; Chainani, A.; Saitoh, T.; Shin, Shik

doi:10.1103/physrevb.79.144528

Cited by 30 publications

(46 citation statements)

References 63 publications

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“…We wish to point out that in all torque measurements a nearly reversible signal was obtained In principle, the origin of the observed temperature dependence of the anisotropy parameter in Sm123 may be related to one of at least five situations: (i) multiband superconductivity, [60][61][62][63][64][65][66][67][68][69] (ii) Fermi surface anisotropy, [70][71][72] (iii) unconventional pairing and anisotropy of the superconducting energy gap, [73][74][75][76][77][78][79][80] (iv) strong coupling, [81][82][83] (v) real limitations of AGLT in the case of highly underdoped superconductors due to their strictly layered structure. Nonlocality, which becomes observable when the mean free path becomes larger than the superconducting coherence length, may be a necessary ingredient for the situations…”

Section: Resultsmentioning

confidence: 99%

Evidence for a temperature dependent anisotropy of the superconducting state parameters in underdopedSmBa2Cu3Ox

et al. 2010

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The temperature dependence of the anisotropy of the superconducting state parameters, γ, was studied by torque magnetometry for the high temperature superconductor SmBa 2 Cu 3 O x in magnetic fields of up to 9 T. The measurements were performed on four underdoped single crystals with oxygen contents corresponding to T c 's varying from 42.8 to 63.6 K. The anisotropy was found to be strongly temperature dependent, while only a weak dependence on the magnetic field was observed. No evidence for a field dependent superfluid density was found. Possible origins of the temperature dependence of the anisotropy are discussed. PACS: 74.25.Bt, 74.25.Ha,

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Section: Resultsmentioning

confidence: 99%

Evidence for a temperature dependent anisotropy of the superconducting state parameters in underdopedSmBa2Cu3Ox

et al. 2010

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“…the experiment by Okawa et al 55 . When used to predict the intensity of the REXS signal, the band structure by Ref.…”

Section: Experiments On Cupratesmentioning

confidence: 87%

Friedel oscillations as a probe of fermionic quasiparticles

Torre

Benjamin

et al. 2016

Phys. Rev. B

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When immersed in a see of electrons, local impurities give rise to density modulations known as Friedel oscillations. In spite of the generality of this phenomenon, the exact shape of these modulations is usually computed only for non-interacting electrons with a quadratic dispersion relation. In actual materials, Friedel oscillations are a viable way to access the properties of electronic quasiparticles, including their dispersion relation, lifetime, and pairing. In this work we analyze the signatures of Friedel oscillations in STM and X-ray scattering experiments, focusing on the concrete example of cuprates superconductors. We identify signatures of Friedel oscillations seeded by impurities and vortexes, and explain experimental observations that have been previously attributed to a competing charge order. Contents

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“…It is known that the kinematic mechanism does not obey the condition of symmetry of the superconducting gap observed in the ARPES experiments [48] and scanning tunnel ing spectroscopy [49,50]. Nevertheless, it should be noted that there is some evidence for deviations of the gap function from cosk x -cosk y [51].…”

Section: Description Of the Superconducting Phasementioning

confidence: 96%

Dependence of the critical temperature of high-temperature cuprate superconductors on hoppings and spin correlations between CuO2 planes

Makarov

Овчинников

Shneider

2012

J. Exp. Theor. Phys.

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The influence of interlayer hoppings on the superconducting transition temperature (T c ) in bilayer cuprates has been studied. The parameter of hopping between layers is expressed as t ⊥ (k) = t ⊥ (cos(k x ) -cos(k y )) 2 and treated as a small perturbation for the states of two CuO 2 planes described by the t-t'-t''-J* model. In the generalized mean field approximation for symmetry of the superconducting gap, neither the interlayer hopping or exchange interaction, nor the pair hopping between CuO 2 layers provides an addi tional mechanism of Cooper pair formation or an increase in T c . In the concentration dependence of T c , the bilayer splitting of the upper Hubbard band of quasi holes is manifested as two peaks with temperatures slightly lower than the maximum T c for a single layer cuprate. Interlayer antiferromagnetic spin correlations suppress bilayer splitting.

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Superconducting electronic state in optimally dopedYBa2Cu3O7−δobserved with laser-excited angle-resolved photoemission spectr

Cited by 30 publications

References 63 publications

Evidence for a temperature dependent anisotropy of the superconducting state parameters in underdopedSmBa2Cu3Ox

Evidence for a temperature dependent anisotropy of the superconducting state parameters in underdopedSmBa2Cu3Ox

Friedel oscillations as a probe of fermionic quasiparticles

Dependence of the critical temperature of high-temperature cuprate superconductors on hoppings and spin correlations between CuO2 planes

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