Understanding of metal-insulator transition in VO₂ based on experimental and theoretical investigations of magnetic features.

ABSTRACT: The metal-insulator transition temperature T_c in VO₂ is experimentally shown to be almost the same as a magnetic transition temperature T_m characterized by an abrupt decrease in susceptibility, suggesting the evidence of the same underlying origin for both transitions. The measurement of susceptibility shows that it weakly increases on cooling for temperature range of T > T_m, sharply decreases near T_m and then unusually increases on further cooling. A theoretical approach for such unusual observations in susceptibility near T_m or below is performed by modeling electrons from each two adjacent V⁴⁺ ions distributed along V-chains as a two-electron system, which indicates that the spin exchange between electrons coul

SUBMITTER: Zhang R 

PROVIDER: S-EPMC6244010 | biostudies-literature | 2018 Nov

REPOSITORIES: biostudies-literature