Superconductivity in Mg-Doped Layered Intermetallic Compound NbB2
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Abstract
We have performed low temperature resistivity ρ(T) and specific heat C(T) measurements on a superconducting polycrystalline Nb0.75Mg0.25B2 sample.
The results indicate that the superconducting transition temperature is ~4.6K. The zero temperature upper critical field determined from the resistivity and specific heat is 3123Oe. The electronic coefficient of specific heat γn=4.51mJmol-1K2 and the Debye temperature θD=419K are obtained by fitting the zero-field specific heat data in the normal state. At low temperatures, the electronic specific heat in the superconducting state follows CesθnTc=2.84exp(1.21Tc/T). This indicates that the superconducting pairing in
Nb0.75Mg0.25B2 has s-wave symmetry.
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