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Renner, Christoph; Revaz, B.; Genoud, Jean-Yves; Kadowaki, K.; Fischer, Ø.

doi:10.1103/physrevlett.80.149

Cited by 959 publications

(307 citation statements)

References 31 publications

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“…We note that Andreev bound states are absent at surfaces perpendicular to the c-axis direction. Therefore, no zero bias conductance peak has been observed by Renner et al in low temperature scanning tunneling spectroscopy experiments performed on (001) oriented surfaces [45,46,47]. A further possibility for the realization of SIN-junctions is the formation of planar junctions using a normal metal and a HTS electrode separated by a thin insulating layer.…”

Section: Zero Bias Conductance Peakmentioning

confidence: 99%

“…Recently, an increasing gap was found with decreasing doping concentration for BSCCO [47,95]. In the case of YBa 2 Cu 3 O 7−δ we investigated the two doping concentrations δ ≃ 0 and δ ≃ 0.4.…”

Section: Tunneling Spectroscopy Of Hts-gbjsmentioning

confidence: 99%

“…A similar behaviour has been observed by Renner al. [46,47] using low temperature scanning tunneling spectroscopy. However, in contrast to our observation these authors report a gap persisting even above T c .…”

Section: Tunneling Spectroscopy Of Hts-gbjsmentioning

confidence: 99%

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Andreev bound states in high temperature superconductors

et al. 1998

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Abstract. Andreev bound states at the surface of superconductors are expected for any pair potential showing a sign change in different k-directions with their spectral weight depending on the relative orientation of the surface and the pair potential. We report on the observation of Andreev bound states in high temperature superconductors (HTS) employing tunneling spectroscopy on bicrystal grain boundary Josephson junctions (GBJs). The tunneling spectra were studied as a function of temperature and applied magnetic field. The tunneling spectra of GBJ formed by YBa2Cu3O 7−δ (YBCO), Bi2Sr2CaCu2O 8+δ (BSCCO), and La1.85Sr0.15CuO4 (LSCO) show a pronounced zero bias conductance peak that can be interpreted in terms of Andreev bound states at zero energy that are expected at the surface of HTS having a d-wave symmetry of the order parameter. In contrast, for the most likely s-wave HTS Nd1.85Ce0.15CuO4−y (NCCO) no zero bias conductance peak was observed. Applying a magnetic field results in a shift of spectral weight from zero to finite energy. This shift is found to depend nonlinearly on the applied magnetic field. Further consequences of the Andreev bound states are discussed and experimental evidence for anomalous Meissner currents is presented.

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Section: Zero Bias Conductance Peakmentioning

confidence: 99%

Section: Tunneling Spectroscopy Of Hts-gbjsmentioning

confidence: 99%

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Andreev bound states in high temperature superconductors

et al. 1998

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“…This similarity might lead one to suspect a connection between the resonance-peak energy and the superconducting gap. However, measurements of the gap in Bi 2 Sr 2 CaCu 2 O 8+δ by tunneling [28][29][30] and photoemission [31,32] indicate that the superconducting gap increases while T c decreases on the underdoped side. While similar measurements are not yet available for YBa 2 Cu 3 O 6+x , infrared conductivity studies of the latter system suggest that the size of the gap does not decrease as x is reduced from 1 [33].…”

Section: Open Questionsmentioning

confidence: 99%

Charge segregation and antiferromagnetism in high-Tc superconductors

Tranquada¹,

Ichikawa²,

Kakurai³

et al. 1999

Journal of Physics and Chemistry of Solids

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Local antiferromagnetism coexists with superconductivity in the cuprates. Charge segregation provides a way to reconcile these properties. Direct evidence for modulated spin and charge densities has been found in neutron and X-ray scattering studies of Nd-doped La 2−x Sr x CuO 4 . Here we discuss the nature of the modulation, and present some new results for a Zn-doped sample. Some of the open questions concerning the connections between segregation and superconductivity are described.

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“…The term pseudogap has been coined to describe this kind of physics. The presence of pseudogap has been established through the measurements of the nuclear magnetic resonance (NMR) [5], the scanning tunneling spectroscopy [6][7][8][9], the analysis of the electronic Raman scattering [10][11][12], through time-resolved optical spectroscopy [13][14][15][16][17][18], and through the ARPES [19][20][21][22][23][24][25]. The observed strong Nernst effect in cuprates has been also attributed to it [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Spin Polaron-Bipolaron Scenario of Three Gap-Like Energy Scales in Superconducting Cuprates

et al. 2010

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We argue that three gaps observed in underdoped cuprates can be attributed to the formation of antiferromagnetic spin polarons and bipolarons. Within the spin polaron scenario the antinodal pseudogap at he high energy scale originates from the change of the Fermi surface topology, induced by antiferromagnetic correlations. That change gives rise to the diminishing of the spectral weight at the antinodal region near the Brillouin zone boundary. We demonstrate that effect by analyzing effective models of doped antiferromagnets. The second type of pseudogap appearing at the intermediate energy scale originates from the phenomena which are precursory to superconductivity and predominantly concern the portion of the Fermi surface near the nodal region. In order to analyze the latter phenomenon we use the negative U Hubbard model, in which many details typical to spin polaron physics are neglected, but which contains the essential ingredient of it, that is the strong short range attraction. The lowest energy scale is related to the true superconducting gap which develops with doping, although both types of pseudogap diminish with doping. This behavior can be explained by the fact that the spin polaron band is empty in the undoped system and therefore the formation of the superconducting state in the system is forbidden. Due to a pedagogical character of this report, we present in the introduction a short overview of mostly recent experimental results which are related to the gap-pseudogap physics.

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Pseudogap Precursor of the Superconducting Gap in Under- and OverdopedBi2Sr2CaCu2

Cited by 959 publications

References 31 publications

Andreev bound states in high temperature superconductors

Andreev bound states in high temperature superconductors

Charge segregation and antiferromagnetism in high-Tc superconductors

Spin Polaron-Bipolaron Scenario of Three Gap-Like Energy Scales in Superconducting Cuprates

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