Influence of the symmetry of hybridization on the critical temperature of multiband superconductors

Reyes, Daniel; Lopes, Nei; Continentino, Mucio A.; Thomas, C.

doi:10.1103/physrevb.99.224514

Cited by 5 publications

(3 citation statements)

References 53 publications

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“…The ratio between hybridization and bandwidth, which depends on the overlap of different wave functions and the depth of the d-band are both sensitive to pressure and chemical doping. Consequently, theoretical phase diagrams obtained as a function of these quantities have a direct relevance to those obtained experimentally when these parameters are varied [71]. Here, we investigate the dependence of the critical temperatures (solid lines) on hybridization for different values of U dc , as shown in Fig.…”

Section: T Versus Vmentioning

confidence: 99%

Interplay between charge density wave and superconductivity in multiband systems with interband Coulomb interaction

et al. 2021

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Section: T Versus Vmentioning

confidence: 99%

Interplay between charge density wave and superconductivity in multiband systems with interband Coulomb interaction

et al. 2021

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“…The ratio between hybridization and bandwidth, which depends on the overlap of different wave functions and the depth of the d-band are both sensitive to pressure and chemical doping. Consequently, theoretical phase diagrams obtained as a function of these quantities have a direct relevance to those obtained experimentally when these parameters are varied [70]. Here, we investigate the dependence of the critical temperatures (solid lines) on hybridization for different values of U dc , as shown in Fig.…”

Section: T Versus Vmentioning

confidence: 99%

Interplay between charge density wave and superconductivity in multi-band systems with inter-band Coulomb interaction

Lopes,

Reyes,

Continentino

et al. 2021

Preprint

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In this work we study the competition or coexistence between charge density wave (CDW) and superconductivity (SC) in a two-band model system in a square lattice. One of the bands has a net attractive interaction (J d ) that is responsible for SC. The model includes on-site Coulomb repulsion between quasi-particles in different bands (U dc ) and the hybridization (V ) between them. We are interested in describing inter-metallic systems with a d-band of moderately correlated electrons, for which a mean-field approximation is adequate, coexisting with a large sp-band. For simplicity, all interactions and the hybridization V are considered site-independent. We obtain the eigenvalues of the Hamiltonian numerically and minimize the free energy density with respect to the relevant parameters to obtain the phase diagrams as function of J d , U dc , V , composition (ntot) and the relative depth of the bands ( d0 ). We consider two types of superconducting ground states coexisting with the CDW. One is a homogeneous ground state and the other is a pair density wave where the SC order parameter has the same spatial modulation of the CDW. Our results show that the CDW and SC orders compete, but depending on the parameters of the model these phases may coexist. The model reproduces most of the experimental features of high dimensionality (d > 1) metals with competing CDW and SC states, including the existence of first and second-order phase transitions in their phase diagrams.

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“…For the sake of simplicity, it is usual to consider the hybridization as a k-independent parameter [16,27,28]. However, for a more appropriated description of these system, it is important to consider a k-dependent hybridization [25,26].…”

Section: Introductionmentioning

confidence: 99%

Effects of a k⃗-dependent Hybridisation on the Fermi surface of an extended d–p Hubbard model

Lalis¹,

Calegari

Prauchner³

et al. 2020

Philosophical Magazine

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The topology of the Fermi surface of an extended d−p Hubbard model is investigated using the Green's function technique in a n-pole approximation. The effects of the d − p hybridization on the Fermi surface are the main focus in the present work. Nevertheless, the effects of doping, Coulomb interaction and hopping to secondnearest-neighbors on the Fermi surface, are also studied. Particularly, it is shown that the crossover from hole-like to electron-like Fermi surface (Lifshitz transition) is deeply affected by the d − p hybridization. Moreover, the pseudogap present in the low doping regime is also affected by the hybridization. The results show that both the doping and the hybridization act in the sense of suppresses the pseudogap. Therefore, the systematic investigation of the Fermi surface topology, shows that not only the doping but also the hybridization can be considered as a control parameter for both the pseudogap and the Lifshitz transition. Assuming that the hybridization is sensitive to external pressure, the present results agree qualitatively with recent experimental data for the cuprate Nd-LSCO.

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Influence of the symmetry of hybridization on the critical temperature of multiband superconductors

Cited by 5 publications

References 53 publications

Interplay between charge density wave and superconductivity in multiband systems with interband Coulomb interaction

Interplay between charge density wave and superconductivity in multiband systems with interband Coulomb interaction

Interplay between charge density wave and superconductivity in multi-band systems with inter-band Coulomb interaction

Effects of a k⃗-dependent Hybridisation on the Fermi surface of an extended d–p Hubbard model

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