Theoretical Study of Superconducting Gap Parameters, Density of States, and Condensation Energy of Two-Band Iron-Based Superconductor BaFe2(As1−x P x )2

This work focuses on the theoretical investigations of some properties of high‐temperature two‐band model iron‐based superconductor Ba1−xRbxFe2As2. The mathematical expressions of superconducting parameters are treated by the temperature‐dependent Green's function formalism. The superconducting order parameters of the material for electron, hole bands and for the interband are plotted as a function of temperature. The parameters decrease with increasing temperature and vanish at the superconducting transition temperature (Tc) of Ba1−xRbxFe2As2. The values of the superconducting order parameters and coupling strength in electron intraband, hole intraband, and the electron–hole interband are computed quantitatively. It is found that the pairing potential of Ba1−xRbxFe2As2 increases as a function of temperature. The phase diagrams of temperature‐dependent electron and hole intrabands and density of states versus excitation energy are plotted and it is observed that both decrease as the excitation energy increases. The impacts of temperature, pairing potential, and transitional temperature on condensation energy are also investigated and the results show that condensation energy decreases with the increase of temperature and pairing potential and vanishes at Tc of Ba1−xRbxFe2As2. Furthermore, the density of states for electron and hole‐intrabands at different temperatures versus excitation energy are plotted, and it is perceived that the density of states decreases gradually as the excitation energy increases and vanishes at low‐temperature values. The current results are compatible with previous findings.

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“…The current finding is compatible with previous results. [14,15,27] Thus, the expression for the superconducting transition temperature becomes…”

Section: Discussionmentioning

confidence: 99%

“…The system model Hamiltonian for Ba 1− x Rb x Fe 2 As 2 is expressed by [ 24–27 ]

$$\overset{̂}{H} = \left(\overset{̂}{H}\right)_{\left(\right. \text{e} \left.\right)} + \left(\overset{̂}{H}\right)_{\left(\right.

…”

Section: Equation Of Motionmentioning

confidence: 99%

Theoretical Study of Some Properties of High‐Temperature Two‐Band Model Iron‐Based Superconductor Ba₁₋_xRb_xFe₂As₂

Gardew

Kahsay

Negussie

2023

Physica Status Solidi (b)

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“…The electron and hole intra-bands have their own coupling pairing potentials of electron and hole intra-band transitions, respectively, and the inter-band pairing interaction potentials. The existence of inter-band pairing interaction potential improves the pairing of the electrons and leads to the vanishing of electron and hole intraband transitions at the same superconducting transition temperature, even though they are different at zero temperature [15]. At the zero temperature, the experimental values of superconducting energy gaps for Ba 1−𝑥 Na 𝑥 Fe 2 As 2 on the electron Fermi surface and on the hole Fermi surface are 8.5 meV and 3.6 meV, respectively [16].…”

Section: Introductionmentioning

confidence: 99%

Theoretical Investigation of the Superconducting and Thermodynamic Properties of Two-Band Model High-Temperature Iron-Based Superconductor Ba1–xNaxFe2As2

Lissanu¹,

Kahsay

Negussie

2023

Ukr. J. Phys.

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This work presents the theoretical investigation of the superconducting and thermodynamic properties of the two-band model high-temperature iron-based superconductor Ba1-xNaxFe2As2. By developing a model Hamiltonian and by employing the well-knownvdouble-time temperature-dependent Green’s function formalism, we have computed the superconducting orderbparameters for the electron and hole intra- and inter-band transitions, superconducting transition temperature, densitiesbof states, and condensation energies. Furthermore, the electronic specific heat and the entropy for electron and hole intra-band transitions have been determined. By using appropriate experimental data and some credible approximations of the parameters in the computed expressions, we have found the phase diagrams of superconducting order parameters versus the temperature, superconducting critical temperature versus the inter-band interaction potential, temperature dependences of the electronic specific heat and entropy for electron and hole intra-band transitions, and densities of states for the electron and hole intra-band transitions as functions of the excitation energy at different values of the temperature. Finally, the phase diagrams of the condensation energy versus the temperature, inter-band pairing potential at T = 0 K versus the condensation energy, and condensation energy versus the superconducting transition temperature (TC) have been drawn. In some of the phase diagrams, the comparison between theoretical and experimental values has been made. The results are in a good agreement with previous findings.

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Possible coexistence of charge density wave and superconductivity and enhancement of the transition temperature for the layered quasi-two-dimensional superconductor 2H-NbSe₂

Gebreyohannes

Singh

2021

J. Phys. Commun.

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Theoretical Study of Superconducting Gap Parameters, Density of States, and Condensation Energy of Two-Band Iron-Based Superconductor BaFe2(As1−x P x )2

Cited by 4 publications

References 23 publications

Theoretical Study of Some Properties of High‐Temperature Two‐Band Model Iron‐Based Superconductor Ba₁₋_xRb_xFe₂As₂

Theoretical Study of Some Properties of High‐Temperature Two‐Band Model Iron‐Based Superconductor Ba₁₋_xRb_xFe₂As₂

Theoretical Investigation of the Superconducting and Thermodynamic Properties of Two-Band Model High-Temperature Iron-Based Superconductor Ba1–xNaxFe2As2

Possible coexistence of charge density wave and superconductivity and enhancement of the transition temperature for the layered quasi-two-dimensional superconductor 2H-NbSe₂

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Theoretical Study of Superconducting Gap Parameters, Density of States, and Condensation Energy of Two-Band Iron-Based Superconductor BaFe2(As1−x P x )2

Cited by 4 publications

References 23 publications

Theoretical Study of Some Properties of High‐Temperature Two‐Band Model Iron‐Based Superconductor Ba1−xRbxFe2As2

Theoretical Study of Some Properties of High‐Temperature Two‐Band Model Iron‐Based Superconductor Ba1−xRbxFe2As2

Theoretical Investigation of the Superconducting and Thermodynamic Properties of Two-Band Model High-Temperature Iron-Based Superconductor Ba1–xNaxFe2As2

Possible coexistence of charge density wave and superconductivity and enhancement of the transition temperature for the layered quasi-two-dimensional superconductor 2H-NbSe2

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Theoretical Study of Some Properties of High‐Temperature Two‐Band Model Iron‐Based Superconductor Ba₁₋_xRb_xFe₂As₂

Theoretical Study of Some Properties of High‐Temperature Two‐Band Model Iron‐Based Superconductor Ba₁₋_xRb_xFe₂As₂

Possible coexistence of charge density wave and superconductivity and enhancement of the transition temperature for the layered quasi-two-dimensional superconductor 2H-NbSe₂