Record Details

Phonons in non-oxide perovskite superconductor MgCNi₃

NOPR - NISCAIR Online Periodicals Repository

View Archive Info
 
 
Field Value
 
Title Phonons in non-oxide perovskite superconductor MgCNi₃
 
Creator Sinha, M M
 
Subject Lattice dynamics
Phonon spectra
Zone center phonons
Intermetalic compound
 
Description 72-74
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.
 
Date 2008-10-22T09:00:29Z
2008-10-22T09:00:29Z
2007-01
 
Type Article
 
Identifier 0019-5596
http://hdl.handle.net/123456789/2283
 
Language en_US
 
Relation H01L 39/00
 
Publisher CSIR
 
Source IJPAP Vol.45(1) [January 2007]