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- W1987271013 abstract "The E 2g mode phonon frequency anomaly, observed in high-pressure Raman measurements for the high-temperature superconductor MgB 2 and conjectured to arise due to a phonon-assisted electronic topological transition (ETT), has been corroborated by us with the details of electronic structure calculations of this compound. The present studies have been carried out with a B-atom displacement of the frozen-in E 2g -mode phonon that mimics the effects of thermal vibrations. We found a splitting of the doubly degenerate σ band along the Γ-A direction. The splitting of the band reduces with pressure, causing an ETT at 18 GPa. This ETT is expected to cause anomaly in the E 2g phonon mode by influencing the ionic system. Our calculated electron-phonon coupling constant λ , for the distorted lattice with a frozen-in displacement, also depicts an anomalous variation around 18 GPa." @default.
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- W1987271013 date "2004-11-12" @default.
- W1987271013 modified "2023-09-26" @default.
- W1987271013 title "High-pressure anomaly in the normal state ofMgB2" @default.
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- W1987271013 doi "https://doi.org/10.1103/physrevb.70.184506" @default.
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