The local atomic structure of MgCNi3 has been determined over the temperature range of 3 to 300 K by Ni K-edge x-ray absorption fine structure measurements. No anomalies were observed near Tc∼7 K. However, below T* ∼70 K the symmetry of Ni6 octahedra is lower than the cubic Pm- 3m determined by conventional diffraction measurements. We suggest that the onset of local distortions could be closely related with removal of the degeneracy in the electronic states dominated by the Ni d bands. The results are discussed in relation to nuclear magnetic resonance, x-ray photoemission measurements, and the superconductivity.
|Original language||English (US)|
|Number of pages||7|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - Feb 1 2003|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics