Comment on: "Band Filling and Interband Scattering Effects in MgB2: Carbon versus Aluminium Doping"

Abstract

In a recent Physical Review Letter Kortus et al. claim that the observed decrease of $T_c$ in Al and C doped MgB${}_2$ samples is mainly due to the band filling by the electron doping but for a fuller understanding of the different behavior of the superconducting energy gaps in Al and C doped samples it is necessary to also include an increased interband scattering for the carbon doped samples. We argue in the following that this latter statement is misleading and is based on the assumption that for carbon doping the two superconducting gaps merge near 10 % carbon doping: an assumption that contradicts most of the existing experimental data.

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References in corpus (7)

• Band filling and interband scattering effects in MgB${}_2$: C vs Al doping
• Carbon doping of superconducting magnesium diboride
• Toward one-band superconductivity in MgB2
• Evidence for Single-gap Superconductivity in Mg(B_{1-x}C_x)_2 Single Crystals with x=0.132 from Point-Contact Spectroscopy
• Retention of Two-Band Superconductivity in Highly Carbon-Doped MgB2
• Systematic study of the two band/two gap superconductivity in carbon-substituted MgB2 by point-contact spectroscopy
• Two band/two gap superconductivity in carbon-substituted MgB2 evidenced by point-contact spectroscopy

Cited by in corpus (12)

• Resonant and crossover phenomena in a multiband superconductor tuning the chemical potential near a band edge
• Strong magnetic pair breaking in Mn substituted MgB_2 single crystals
• Superconductivity of magnesium diboride
• Point-contact spectroscopy of Al- and C-doped MgB2. Superconducting energy gaps and scattering studies
• MgB2 single crystals substituted with Li and with Li-C: Structural and superconducting properties
• Role of charge doping and lattice distortions in codoped Mg_{1-x}(AlLi)_{x}B_2 compounds
• Isotope effect on the E2g phonon and mesoscopic phase separation near the electronic topological transition in Mg1-xAlxB2
• Superconducting properties of nanocrystalline MgB${}_2$
• Local Tunneling Study of Three-Dimensional Order Parameter in the $\pi$-band of Al-doped MgB${}_2$ Single Crystals
• Theory of vortices in hybridized ballistic/diffusive-band superconductors
• Two-bands superconductivity with intra- and interband pairing for synthetic superlattices
• Effects of magnetic and non-magnetic doping on the vortex lattice in MgB${}_2$