| Texto completo | |
| Autor(es): |
Rodrigues, Ariano De Giovanni
;
Perucchi, Andrea
;
Tomarchio, Luca
;
Verseils, Marine
;
Parisiades, Paraskevas
;
Baptiste, Benoit
;
Beneut, Keevin
;
Gilioli, Edmondo
;
Lupi, Stefano
;
Gauzzi, Andrea
Número total de Autores: 10
|
| Tipo de documento: | Artigo Científico |
| Fonte: | PHYSICAL REVIEW B; v. 112, n. 3, p. 8-pg., 2025-07-23. |
| Resumo | |
By means of Raman scattering and infrared reflectivity spectroscopies under high pressure, we investigate the metallic phase induced by pressure at Pcr = 17.5 GPa in the Mott insulator (NaMn3)Mn4O12 (NMO). Upon approaching Pcr, two signatures of the presence of mobile carriers become increasingly pronounced: a Fano-like lineshape of the Raman modes and a Drude-like peak in the optical conductivity spectra. Remarkably, all Raman and infrared modes display a continuous evolution with pressure up to 22 GPa, indicating that no structural distortion occurs at the transition owing to the very compact quadruple perovskite structure of NMO. We therefore propose a unique scenario of a second-order Mott phase transition where only the electronic degrees of freedom are active, which opens the possibility of probing the effective Hamiltonian of the transition disentangled from the lattice degrees of freedom. (AU) | |
| Processo FAPESP: | 17/11025-5 - Efeitos de altas pressões nas propriedades estruturais e dinâmicas de perovskitas |
| Beneficiário: | Ariano De Giovanni Rodrigues |
| Modalidade de apoio: | Bolsas no Exterior - Pesquisa |
| Processo FAPESP: | 19/14100-3 - 27th AIRAPT International Conference on High Pressure Science and Technology |
| Beneficiário: | Ariano De Giovanni Rodrigues |
| Modalidade de apoio: | Auxílio à Pesquisa - Reunião - Brasil |
| Processo FAPESP: | 21/13974-0 - Estudos em altas pressões hidrostáticas de vidros silicatos |
| Beneficiário: | Ariano De Giovanni Rodrigues |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |