Phonon dispersions and anomalies of MgCNi3 single-crystal superconductors determined by inelastic x-ray scattering
Hawoong Hong, Mary Upton, Ayman H. Said, Hyun-Sook Lee, Dong-Jin Jang, Sung-Ik Lee, Ruqing Xu, T.-C. Chiang
DOI 10.1103/PhysRevB.82.134535 · Physical Review B
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Abstract
The intermetallic perovskite MgCNi3 superconducts at ∼8 K despite its high Ni content; the underlying mechanism is thought to be pairing via phonons. Prior theoretical calculations of the phonon-dispersion relations showed soft modes, anomalies, and regions of imaginary frequencies possibly relevant to the superconducting transition, but there are large discrepancies among the calculations. To clarify this issue, we have performed inelastic x-ray scattering measurements of the phonon-dispersion relations. The results confirm soft longitudinal acoustic modes near (0,12,12) and (12,12,12) but disprove a pronounced transverse acoustic anomaly near (14,14,14).
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. | 8 | Pressure not reported | unknown |
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