Influence of multiorbital and anisotropic Coulomb interactions on isotope effect coefficient in doped Fe-based superconductors

Rani, Luxmi; Ajay, Ajay

doi:10.1016/j.physc.2017.04.006

Cited by 3 publications

(1 citation statement)

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“…[41] Previously, we have studied and numerically analyzed the electronic states and isotope effect in iron pnictides within two orbital per site model as a function of various model parameters within the BCS framework, using Green's function formalism. [42][43][44] In the present work, we consider the three-orbital analysis along with the incorporation of PG arising out of Hund's coupling parameter to investigate specific heat variations in ironpnictide systems. In the next section, the model of the Hamiltonian and theoretical formalism of the current work are described.…”

Section: Introductionmentioning

confidence: 99%

Influence of Multi‐Orbitals and Hund's Coupling Induced Pseudogap on Specific Heat Jump in Iron‐Pnictide High T_c Superconductors

Ahalawat

Rani

Ajay

2022

Physica Status Solidi (b)

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A three‐orbital per site theoretical model study is attempted to analyze the nature of specific heat in iron‐based superconductors. Based on recent experimental data, it is found that the five Fe 3d orbitals, Hund's coupling, and intra‐ and inter‐electron orbital correlations play a significant role in the electronic properties of these systems. Thus, in the present work, a model Hamiltonian containing hopping between orbitals, Hund's coupling, and intra‐ and inter‐orbital Coulomb interactions is employed for iron pnictide. Employing Green's function technique within Bardeen–Cooper–Schrieffer (BCS) mean‐field approximation, expressions of superconducting energy gap parameter and quasiparticle energies are obtained. Considering these parameters, specific heat is calculated and its variation with temperature and other parameters of the model Hamiltonian is analyzed. Also, a pseudogap (PG) parameter, arising out of multi‐orbitals’ Hund's coupling, as supported by angle‐resolved photoemission spectroscopy and scanning tunneling microscopy experiments, is introduced. The expression of specific heat is numerically analyzed to pinpoint its variation below and above the transition temperature (T c). Self‐consistent numerical analysis of the specific heat jump as a function of multi‐orbital hopping, electron interactions, and Hund's coupling in terms of PG parameter is shown in detail. Finally, the outcomes are compared with recent theoretical and experimental data available on specific heat variations in iron superconductors like LaOFeAs system.

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Section: Introductionmentioning

confidence: 99%

Influence of Multi‐Orbitals and Hund's Coupling Induced Pseudogap on Specific Heat Jump in Iron‐Pnictide High T_c Superconductors

Ahalawat

Rani

Ajay

2022

Physica Status Solidi (b)

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Study of inter-band pair transfer and density of states on isotope effect in TTF[Ni (dmit)2]2 organic superconductor

Tewari

Dhyani

et al. 2020

Physica C: Superconductivity and its Applications

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Influence of pseudo-gap and interlayer coupling on isotope effect in bilayer cuprate superconductors

Tewari

Ahlawat

Dhyani

et al. 2021

Physica C: Superconductivity and its Applications

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Influence of multiorbital and anisotropic Coulomb interactions on isotope effect coefficient in doped Fe-based superconductors

Cited by 3 publications

References 31 publications

Influence of Multi‐Orbitals and Hund's Coupling Induced Pseudogap on Specific Heat Jump in Iron‐Pnictide High T_c Superconductors

Influence of Multi‐Orbitals and Hund's Coupling Induced Pseudogap on Specific Heat Jump in Iron‐Pnictide High T_c Superconductors

Study of inter-band pair transfer and density of states on isotope effect in TTF[Ni (dmit)2]2 organic superconductor

Influence of pseudo-gap and interlayer coupling on isotope effect in bilayer cuprate superconductors

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Influence of multiorbital and anisotropic Coulomb interactions on isotope effect coefficient in doped Fe-based superconductors

Cited by 3 publications

References 31 publications

Influence of Multi‐Orbitals and Hund's Coupling Induced Pseudogap on Specific Heat Jump in Iron‐Pnictide High Tc Superconductors

Influence of Multi‐Orbitals and Hund's Coupling Induced Pseudogap on Specific Heat Jump in Iron‐Pnictide High Tc Superconductors

Study of inter-band pair transfer and density of states on isotope effect in TTF[Ni (dmit)2]2 organic superconductor

Influence of pseudo-gap and interlayer coupling on isotope effect in bilayer cuprate superconductors

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Influence of Multi‐Orbitals and Hund's Coupling Induced Pseudogap on Specific Heat Jump in Iron‐Pnictide High T_c Superconductors

Influence of Multi‐Orbitals and Hund's Coupling Induced Pseudogap on Specific Heat Jump in Iron‐Pnictide High T_c Superconductors