Pseudogap influence on the 2Δ(0)/Tc ratio in d-wave superconductors

Ţifrea, I.; Grosu, I.; Crişan, M.

doi:10.1016/s0921-4534(01)01072-3

Cited by 10 publications

(27 citation statements)

References 22 publications

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“…These critical pairing interactions were not discussed in Ref. [7]. However, they were considered in a similar model by Pistolesi and Nozières [8].…”

Section: Numerical Resultsmentioning

confidence: 98%

“…3 we plot ∆ o /t vs V d /t for several values of the pseudogap parameter, E g /t, when we adopt the aproximation of Ref. [7], namely, B o /t ≡ 0. This approximation does not produce a critical value of the interaction potential.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…However, the inclusion of order parameters with another symmetry is not a difficult task in our working scheme. With this point of view in mind and following the model of Ţ ifrea, Grosu and Crisan [7] we have studied their model to treat delicate points like the critical interaction potential.…”

Section: Discussionmentioning

confidence: 99%

“…For example, the authors of Ref. [7] did not find critical pairing interactions to have T c = 0 and ∆ o = 0. These considerations have been properly taken into account by Pistolesi and Nozières [8] in a similar model to ours.…”

Section: The "Pseudogap" Modelmentioning

confidence: 99%

“…This paper is organized as follows. In Section 2, we present the pseudogap model, following the steps of Ţ ifrea, Grosu and Crisan [7]. In Section 3 we present our numerical results.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Tc and deltao in a phenomenological ''pseudogap'' model

Romero¹,

Sánchez²,

Rodríguez-Núñez³

et al. 2003

Braz. J. Phys.

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We study numerically superconductivity in a system characterized by the presence of a phenomenological "pseudogap", E g , in the energy spectrum, for 0 ≤ T ≤ T s . T * is a crossover temperature. As a simplification, the pseudogap and the superconducting gap have the same s-wave symmetry. We find that for ∀Eg = 0 we require a critical value of the superconducting interaction, V d , to produce a finite superconducting critical temperature, T c and another one for ∆ o = 0.

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“…These critical pairing interactions were not discussed in Ref. [7]. However, they were considered in a similar model by Pistolesi and Nozières [8].…”

Section: Numerical Resultsmentioning

confidence: 98%

Section: Numerical Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: The "Pseudogap" Modelmentioning

confidence: 99%

“…This paper is organized as follows. In Section 2, we present the pseudogap model, following the steps of Ţ ifrea, Grosu and Crisan [7]. In Section 3 we present our numerical results.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Tc and deltao in a phenomenological ''pseudogap'' model

Romero¹,

Sánchez²,

Rodríguez-Núñez³

et al. 2003

Braz. J. Phys.

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Ţifrea

2003

Journal of Superconductivity: Incorporating Novel Magnetism

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The BCS–BE crossover phase diagram atT= 0 K for a d-wave superconductor: the importance of the Debye frequency and the tight binding band structure

Rodríguez-Núñez

Schmidt

Alvarez-Llamoza

et al. 2004

J. Phys.: Condens. Matter

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We consider the phase diagram of the BCS (Bardeen–Cooper–Schrieffer)–BE (Bose–Einstein) crossover in the ground state (T = 0 K) of a dx2−y2-wave superconductor, with a nearest neighbour tight binding structure, when we take into account the Debye (phononic) frequency around the chemical potential, μ. This approach is a continuation of the work of den Hertog (1999 Phys. Rev. B 60 559) and that of Soares et al (2002 Phys. Rev. B 65 174506). The latter authors considered the influence of the second-nearest neighbours, but neither set of authors took into account the effect of the Debye frequency, ωD, or the influence of the next nearest neighbour matrix hopping element. We have found the following results: (1) there is not a metallic phase—that is, when , , , and , where n is the carrier density per site, V is the attractive interaction, t is the nearest neighbour hopping integral, and is the next nearest neighbour hopping ratio; (2) the BCS–BE crossover line is strongly affected by the presence of ωD/4t and that of —actually, the values of V/4t needed to achieve the Bose–Einstein regime become extremely large for small values of ωD/4t; and (3) both Δ/4t and μ/4t strongly depend on the values of ωD/4t and . The results (1) are in agreement with the ones found by Perali et al (2003 Phys. Rev. B 68 066501 (Preprint cond-mat/0211132)) and Rodríguez-Núñez et al (2003 Phys. Rev. B 68 066502), and in disagreement with those of den Hertog and Soares et al.

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Pseudogap influence on the 2Δ(0)/Tc ratio in d-wave superconductors

Cited by 10 publications

References 22 publications

Tc and deltao in a phenomenological ''pseudogap'' model

Tc and deltao in a phenomenological ''pseudogap'' model

Untitled

The BCS–BE crossover phase diagram atT= 0 K for a d-wave superconductor: the importance of the Debye frequency and the tight binding band structure

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