Leggett Modes Accompanying Crystallographic Phase Transitions
| Autor: | Meier, Quintin N., Hickox-Young, Daniel, Laurita, Geneva, Spaldin, Nicola A., Rondinelli, James M., Norman, Michael R. |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Phys. Rev. X 12, 011024 (2022) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevX.12.011024 |
| Popis: | Higgs and Goldstone modes, well known in high energy physics, have been realized in a number of condensed matter physics contexts, including superconductivity and magnetism. The Goldstone-Higgs concept is also applicable to and gives rise to new insights on structural phase transitions. Here, we show that the Leggett mode, a collective mode observed in multi-band superconductors, also has an analog in crystallographic phase transitions. Such structural Leggett modes can occur in the phase channel as in the original work of Leggett, \href{https://doi.org/10.1143/PTP.36.901}{Prog.\ Theor.\ Phys.\ \textbf{36}, 901 (1966)}. That is, they are antiphase Goldstone modes (anti-phasons). In addition, a new collective mode can also occur in the amplitude channel, an out-of phase (antiphase) Higgs mode, that should be observable in multi-band superconductors as well. We illustrate the existence and properties of these structural Leggett modes using the example of the pyrochlore relaxor ferroelectric, Cd$_2$Nb$_2$O$_7$. Comment: 7 pages, 2 figures |
| Databáze: | arXiv |
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