Temperature dependence of transmittance and effective surface resistance of MgB2 film

Moarrefi-Romeileh, M.; Yavari, H.; Joata-Bayrami, Asadollah; Abolhassani, M. R.

doi:10.1016/j.physb.2011.08.011

Cited by 3 publications

(2 citation statements)

References 26 publications

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“…We assert that the literature on this topic, to the best of our knowledge, contains only inconclusive evidence for s-wave symmetry. It is worthwhile to point out that there have also been reports of low-temperature penetration-depth measurements that indicate unconventional superconductivity [51][52][53][54][55]. In those works, however, the explicit energy-gap functional form has not been specified.…”

Section: Discussionmentioning

confidence: 99%

Theoretical and experimental evidence for a nodal energy gap in MgB₂

Agassi

Oates

2017

Supercond. Sci. Technol.

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We present a phenomenological model that strongly suggests that the smaller of the two energy gaps in MgB2, the so-called π gap, contains nodal lines with a six-fold symmetry (i-wave). The model also indicates that the larger gap, the so-called σ gap, is conventional s-wave. The model is an extension of the BCS gap equation that accounts for the elastic anisotropy in MgB2 and the Coulomb repulsion. It is based on a phononic pairing mechanism and assumes no coupling between the two energy gaps in MgB2 at zero temperature. All of the parameters of the model, such as sound velocities and masses, are independently determined material constants. The results agree with a previous ad-hoc hypothesis that the π energy gap has six nodal lines. That hypothesis was motivated by low-temperature measurements of the surface impedance and intermodulation distortion in high-quality thin films. We briefly review experimental evidence in the literature that is relevant to the energy-gap symmetry. We find that the evidence from the literature for s-wave is inconclusive. Our finding is that the π gap has six nodal lines.

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Section: Discussionmentioning

confidence: 99%

Theoretical and experimental evidence for a nodal energy gap in MgB₂

Agassi

Oates

2017

Supercond. Sci. Technol.

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“…Their ratio is estimated to be min max 0.3 -0.4 ∆ ∆ ≈ using several experiments. The two-gap model is shown to consistently describe the optical conductivity and thermodynamic properties of MgB 2 [7]- [9]. However, there is no general agreement whether MgB 2 is an s-wave BCS type superconductor or not.…”

Section: Introductionmentioning

confidence: 98%

Frequency Dependence of Optical Conductivity in MgB<sub>2</sub> Superconductor

Shojaei¹,

Moarrefi-Romeileh²,

Joata-Bayrami³

2015

WJCMP

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Using Green's function method, the frequency dependence of optical conductivities of high-quality MgB2 film is calculated in the framework of the single-and two-band model. By comparing the numerical and experimental results, it is shown that the single-gap isotropic model is insufficient to understand consistently optical behaviors. Also, it is concluded that the two-band model consistently describes the optical behaviors. In the two-gap model, we consider that the both components of optical conductivity are a weighted sum of the contribution from σ and π bonds and hybridization between them is negligible.

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Combining the roles of bose correlations and pairing associations to condensation and its influence on optical conductivity; special superconductors

Saeb

Eatesami

2018

Physica B: Condensed Matter

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Temperature dependence of transmittance and effective surface resistance of MgB2 film

Cited by 3 publications

References 26 publications

Theoretical and experimental evidence for a nodal energy gap in MgB₂

Theoretical and experimental evidence for a nodal energy gap in MgB₂

Frequency Dependence of Optical Conductivity in MgB<sub>2</sub> Superconductor

Combining the roles of bose correlations and pairing associations to condensation and its influence on optical conductivity; special superconductors

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Temperature dependence of transmittance and effective surface resistance of MgB2 film

Cited by 3 publications

References 26 publications

Theoretical and experimental evidence for a nodal energy gap in MgB2

Theoretical and experimental evidence for a nodal energy gap in MgB2

Frequency Dependence of Optical Conductivity in MgB&lt;sub&gt;2&lt;/sub&gt; Superconductor

Combining the roles of bose correlations and pairing associations to condensation and its influence on optical conductivity; special superconductors

Contact Info

Product

Resources

About

Theoretical and experimental evidence for a nodal energy gap in MgB₂

Theoretical and experimental evidence for a nodal energy gap in MgB₂

Frequency Dependence of Optical Conductivity in MgB<sub>2</sub> Superconductor