Electron spin resonance in the superconducting state of Ba0.6K0.4Fe2As2

Dlamini, Zolile Wiseman; Srinivasan, A.; Ma, Yanwei

doi:10.1063/1.5033144

Cited by 1 publication

(2 citation statements)

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“…The parent compound BaFe 2 As 2 is an iron arsenide compound and crystallizes with the tetragonal ThCr 2 Si 2 type structure, space group I4/mmm [23]. Its crystal structure and SDW transition are strongly affected by hole doping with potassium [24]. The compound BaFe 2 As 2 changes structural and magnetic transitions simultaneously at T s ¼ T N ≈ 140 K [25].…”

Section: Introductionmentioning

confidence: 99%

“…Experiment has been revealed that in potassium substitution barium iron arsenide superconductor (Ba 1−x K x Fe 2 As 2 ), superconductivity appears for 0:1 ≤ x ≤ 1 in both the orthorhombic and tetragonal phases and for 0:1 ≤ x <0:4, the SDW and SC orders interplay at low temperature [30]. The coexistence of magnetism and superconductivity strongly emphasizes that magnetic spin fluctuations are involved in the Cooper pairing in Fe-based superconductors [24]. As the doping level (x in Ba 1−x K x Fe 2 As 2 ) increases, the electron Fermi pocket continuously shrinks, whereas the hole pocket becomes larger.…”

Section: Introductionmentioning

confidence: 99%

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Theoretical Investigation of the Interplay of Superconductivity and Magnetism in Ba1−xKxFe2As2 Superconductor in a Two-Band Model by Using the Bogoliubov Transformation Formalism

Mebratie,

Bekele

2023

Advances in Condensed Matter Physics

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The main focus of this article is to investigate the theoretical interplay of magnetism and superconductivity in a two-band model for the iron-based superconductor Ba1−xKxFe2As2. On the basis of experimental results, the two-band model Hamiltonian was considered. We obtained mathematical statements for the superconductor Ba1−xKxFe2As2 superconducting (SC) transition temperature, spin-density-wave (SDW), transition temperature, superconductivity order parameter, and SDW order parameter from the Bogoliubov transformation formalism and the model Hamiltonian. Furthermore, an expression for the dependence of the SDW transition temperature on the SDW order parameter and the dependence of the SC transition temperature on the SDW order parameter was obtained for Ba1−xKxFe2As2. By substituting the experimental and theoretical values of the parameters in the derived statements, phase diagrams of the SC transition temperature versus the SDW order parameter and the SDW transition temperature versus the SDW order parameters have been plotted to demonstrate the dependence of the SDW order parameter on transition temperatures. By combining the two-phase diagrams, we depicted the possible coexistence of superconductivity and magnetism for the Ba1−xKxFe2As2 superconductor. The phase diagrams of temperature versus SC order parameter and temperature versus SDW order parameter were also plotted to show the dependence of order parameters on temperature for the Ba1−xKxFe2As2 superconductor.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%