Probing phase transition in VO₂ with the novel observation of low-frequency collective spin excitation.

ABSTRACT: VO₂ is well known for its first order, reversible, metal-to-insulator transition (MIT) along with a simultaneous structural phase transition (SPT) from a high-temperature metallic rutile tetragonal (R) to an insulating low-temperature monoclinic (M1) phase via two other insulating metastable phases of monoclinic M2 and triclinic T. At the same time, VO₂ gains tremendous attention because of the half-a-century-old controversy over its origin, whether electron-electron correlation or electron-phonon coupling trigger the phase transition. In this regard, V_1-xMg_xO₂ samples were grown in stable phases of VO₂ (M1, M2, and T) by controlled doping of Mg. We have observed a new collective mode in the low-frequency Raman spectra of al

SUBMITTER: Basu R 

PROVIDER: S-EPMC7005027 | biostudies-literature | 2020 Feb

REPOSITORIES: biostudies-literature