Evidence for Coexistence of the Superconducting Gap and the Pseudogap in Bi-2212 from Intrinsic Tunneling Spectroscopy

Krasnov, Vladimir M.; Yurgens, A.; Winkler, Dag; Delsing, Per; Claeson, T.

doi:10.1103/physrevlett.84.5860

Cited by 328 publications

(424 citation statements)

References 25 publications

(58 reference statements)

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“…Specifically, for the values that correspond to eqs. (3,4), the model is close to the BCS limit [6]. In fact the rise-and-fall of T c with the doping level that we have found in the delta-shell model is only present at low values ofg.…”

Section: The Superconducting Gapmentioning

confidence: 67%

“…This was legitimate back then because only experiments that probed the phase coherence of the condensate (Andreev, Raman, penetration depth) had been able to measure ∆ c . However, as we mentioned in the introduction, it has recently been shown experimentally [2,3] that there are actually two gaps in the spectrum of single-particle excitations: one of them corresponds to ∆ p , while the other, smaller one closes in at T = T c , very much like a BCS gap. It is this second gap that we have obtained in our calculations, and in our picture it should coincide with the coherence energy ∆ c .…”

Section: The Superconducting Gapmentioning

confidence: 99%

“…The universal character of the empirical law of eq. (2), on the other hand, is embodied in the fact that the relations (3,4) between the four quantities are the same for all systems. By fitting relative quantities like T c /T c,max and universal trends with doping we can hope to have obtained results dependent more on the overall properties of our model than on its material-specific, no doubt inadequate, details.…”

Section: The Modelmentioning

confidence: 99%

“…For the values of the parameters given in eqs. (3,4), T c,max scales with h 2 /2m * r 2 Cu−Cu and is given by…”

Section: Pressure Dependence Of T Cmentioning

confidence: 99%

“…The former corresponds to the superconducting gap seen in phase-sensitive experiments (Andreev reflection, penetration depth and Raman scattering), while the later is the "pseudogap" seen in experiments that probe the one-particle spectrum (photoemission and tunnelling). In fact some experiments belonging to the later class seem to be able to detect both "gaps" simultaneously: specifically, ∆ c and ∆ p appear to have been resolved, as two distinct features in the single-particle excitation spectrum, in angle-integrated photoemission experiments on LSCO by Sato et al [2] and in intrinsic c-axis tunneling spectrosopy experiments on BSCCO by Krasnov et al [3] Here we address the following question: "which, if any, of these two energies is the 'superconducting gap', in the BCS sense? "…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

On the nature of the superconducting gap in the cuprates

Quintanilla¹,

Györffy²

2002

J. Phys.: Condens. Matter

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Recent experiments indicate that the excitation spectrum of the cuprates is characterised, in the superconducting state, by two energy scales: the "coherence energy" ∆ c and the "pseudogap" ∆ p . Here we consider a simple generalisation of the BCS model that yields exotic pairing and can describe, phenomenologically, the generic trends in the critical temperature T c of cuprate superconductors. We use the model to predict the gap in the single-particle spectrum arising from the superconductivity and we find evidence that it corresponds to the lower of the two energy scales, ∆ c , seen in the experiments. This provides further support to the view that the origin of the pseudogap is not superconducting fluctuations.

show abstract

Section: The Superconducting Gapmentioning

confidence: 67%

Section: The Superconducting Gapmentioning

confidence: 99%

Section: The Modelmentioning

confidence: 99%

“…For the values of the parameters given in eqs. (3,4), T c,max scales with h 2 /2m * r 2 Cu−Cu and is given by…”

Section: Pressure Dependence Of T Cmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

On the nature of the superconducting gap in the cuprates

Quintanilla¹,

Györffy²

2002

J. Phys.: Condens. Matter

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Phonon Self-Energy in the Presence of Charge and Spin-Density Waves

Gȩbarowski

Mierzejewski

Zieliński

2002

phys. stat. sol. (b)

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Subject classification: 74.25.Kc We discuss the phonon self-energy in the presence of isotropic and anisotropic gaps, which originate from the charge (CDW) and spin-density waves (SDW). In order to connect our results to the problem of high-temperature superconductivity a two-dimensional lattice has been considered. The shift of the phonon frequency and the modification of the linewidth is investigated for different phonon momenta. We show that the onset of a gap leads predominantly to the hardening of low frequency modes and softening of modes, which correspond to higher frequencies. In the latter case the modification of phonon properties depends on the symmetry of the gap. For the isotropic gap the softening of frequencies is important only for phonons with small momentum, whereas for the d-wave gap also properties of phonons with large momentum can seriously be modified.

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Conduction mechanism in Pr‐doped GdBa ₂ Cu ₃ O ₇

Akhavan

2004

phys. stat. sol. (c)

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The normal state resistivity of single phase polycrystalline Gd(Ba 2-x Pr x )Cu 3 O 7+δ samples with 0.0 ≤ x ≤ 0.50 have been investigated. The two-dimensional variable range hopping is dominant in the normal state resistivity of the samples. The conduction shows that Pr-doping strongly localizes the carriers in normal state, and finally causes the suppression of superconductivity. Based on the resistivity measurements, the effect of Pr substitution in 123 structure of HTSC at Gd or Ba site is to increase the pseudogap temperature T s , although, Pr at Ba site has a stronger effect on the suppression of T s and superconductivity. Prdoping not only reduces the carrier density and induces pseudogap, but also simultaneously increases T s and suppresses the linearity behavior of resistivity vs. temperature in the normal state.1 Introduction The normal state of the high temperature cuprate superconductors shows many unusual properties, which are far from the standard Fermi liquid behavior. An example is the so-called pseudogap behavior observed in the under-doped region near the Mott insulating phase, which is a frequency threshold for the strong excitation of spin and charge modes [1]. Among different models for describing the charge transport in materials, hopping conduction between localized states have been widely used for normal state of HTSC, semiconductors, and perovskites. In hopping conduction, the temperature dependence of resistivity is ρ = ρ 0 (T/T 0 ) 2p exp(T 0 /T) p , where T 0 is a characteristic temperature, which will be discussed later, and p = 1/3 in two dimensions (2D), p=1/4 in three dimensions (3D), and p = 1/2 in Coulomb gap (CG) regime [2]. The CG, 2D-VRH, and 3D-VRH have been reported for normal state resistivity of different HTSCs [3].The pseudogap has been observed from different experiments. In addition, due to the extremely complex structural and electronic nature of the high T c cuprates [4], and the somewhat controversial nature of much of the current experimental data, there are many theoretical attempts to explain the pseudogap behavior. A number of families of HTSC have also shown evidences of pseudogap [5]. In this paper, through resistivity measurements, we will investigate the effect of Pr at Ba and R sites in GdBa 2 Cu 3 O 7 -based compound from the conduction mechanism and pseudogap points of view.

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Evidence for Coexistence of the Superconducting Gap and the Pseudogap in Bi-2212 from Intrinsic Tunneling Spectroscopy

Cited by 328 publications

References 25 publications

On the nature of the superconducting gap in the cuprates

On the nature of the superconducting gap in the cuprates

Phonon Self-Energy in the Presence of Charge and Spin-Density Waves

Conduction mechanism in Pr‐doped GdBa ₂ Cu ₃ O ₇

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Evidence for Coexistence of the Superconducting Gap and the Pseudogap in Bi-2212 from Intrinsic Tunneling Spectroscopy

Cited by 328 publications

References 25 publications

On the nature of the superconducting gap in the cuprates

On the nature of the superconducting gap in the cuprates

Phonon Self-Energy in the Presence of Charge and Spin-Density Waves

Conduction mechanism in Pr‐doped GdBa 2 Cu 3 O 7

Contact Info

Product

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About

Conduction mechanism in Pr‐doped GdBa ₂ Cu ₃ O ₇