Abstract
We report on the Meissner effect of Mg-doped InN film with superconducting transition onset temperature Tc,onset of 5 K. Mg-doped InN is magnetically ordered and exhibits a simultaneous first-order magnetic and electric transition near 50 K. Its behavior is similar to that of iron-based superconductors. A strong correlation is proposed to exist between structural distortion and superconductivity when Mg is doped into InN. The suppression of magnetic ordering close to Tc by doping is further demonstrated by anisotropic magnetoresistance and M-H measurements. The findings suggest that the superconducting mechanism in the system may not be conventional BCS.
Highlights
Miura et al first observed the superconductivity of InN-based (Tc ∼ 3 K) systems in 1997
The lowest carrier density of 2 × 1017 cm−3 is determined by the Mott transition, and the highest density of 5 × 1020 cm−3 is determined by the superconductor to metal transition.[6]
The Mg-doped InN (InN:Mg) film that is studied was grown on (0001) sapphire substrates with a 2 μm-thick GaN buffer layer by metal organic vapor phase epitaxy (MOVPE) in an Aixtron 200/4 RF-S reactor
Summary
Miura et al first observed the superconductivity of InN-based (Tc ∼ 3 K) systems in 1997. Suppressing the magnetic order of Fe-based superconductors by doping them with impurities or vacancies (electrons or holes) is important in ensuring their superconductivity.[22] the anomalies in both resistivity and magnetic susceptibility have been demonstrated to be related to the structural distortion (or transformation) of the lattice and magnetic alignment in favor of superconductivity.[23,24,25,26,27,28,29] Neutron diffraction and NMR experiments have further indicated that, FeSe1-x is an unconventional superconductor.[26] this work concerns the structural and magnetic characteristics of superconducting Mg-doped InN films, which are compared with those of non-superconducting InN films.
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