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|Title:||Phonons in non-oxide perovskite superconductor MgCNi₃|
|Authors:||Sinha, M M|
|Keywords:||Lattice dynamics;Phonon spectra;Zone center phonons;Intermetalic compound|
|IPC Code:||H01L 39/00|
|Abstract:||The new intermetallic non-oxide perovskite superconductor MgCNi₃ was discovered by He et al, Nature, 411(2001) 54, following on from the breakthrough of the finding of the MgB₂ superconductor at the beginning of 2001. MgB₂ has subsequently been intensively studied; however, less attention has been paid to MgCNi₃ due to its much lower superconducting transition temperature (Tc ~8 K), as compared to that of MgB₂ (Tc ~39 K). But it has many interesting properties, which need to be focused on to obtain an understanding of its complicated physics. Being a perovskite superconductor like Ba₁₋xKxBiO₃ and cuprate superconductors, MgCNi₃ is special it is neither an oxide nor does it contains any copper. Meanwhile, MgCNi₃ can be regarded as fcc Ni with only one quarter of Ni replaced by Mg and with C sitting on the octahedral sites. The fact that superconductivity rather than ferromagnetism occurs in a compound where so much nickel is present is surprising and suggest that MgCNi₃ is a candidate for exhibiting unconventional superconductivity. In this work, a de Launey angular force constant model has been used to study the phonons in MgCNi₃. The phonon dispersion curves in the symmetric directions are plotted and compared with available results.|
|Appears in Collections:||IJPAP Vol.45(01) [January 2007]|
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