Observation of a low-symmetry crystal structure for superconducting MgCNi3 by Ni K-edge x-ray absorption measurements
A. Yu. Ignatov, L. M. Dieng, T. A. Tyson, T. He, R. J. Cava
DOI 10.1103/PhysRevB.67.064509 · Physical Review B
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Abstract
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∼7K. However, below T*∼70K 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MgCNi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7 | Pressure not reported | unknown |
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