Phonon softening and superconductivity triggered by spin-orbit coupling in simple-cubic α-polonium crystals
SCIE
SCOPUS
- Title
- Phonon softening and superconductivity triggered by spin-orbit coupling in simple-cubic α-polonium crystals
- Authors
- Kang, CJ; Kim, K; Min, BI
- Date Issued
- 2012-08-20
- Publisher
- APS
- Abstract
- We have investigated the mechanism of stabilizing the simple-cubic (sc) structure in polonium (alpha-Po), based on the phonon dispersion calculations using the first-principles all-electron band method. We have demonstrated that the stable sc structure results from the suppression of the Peierls instability due to the strong spin-orbit coupling (SOC) in alpha-Po. We have also discussed the structural chirality realized in beta-Po, as a consequence of the phonon instability. Further, we have explored the possible superconductivity in alpha-Po, and predicted that it becomes a superconductor with T-c similar to 4 K. The transverse soft phonon mode at q approximate to 2/3 R, which is greatly influenced by the SOC, plays an important role both in the structural stability and the superconductivity in alpha-Po.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/12274
- DOI
- 10.1103/PHYSREVB.86.054115
- ISSN
- 1098-0121
- Article Type
- Article
- Citation
- PHYSICAL REVIEW B, vol. 86, no. 5, page. 54115, 2012-08-20
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