A series of Ruddlesden-Popper-type Srn+1VnO3n+1 (n = 1, 2) (001) epitaxial thin films was grown on LaAlO3 and LaSrGaO4 substrates with tensile and compressive epitaxial strains, respectively. The decrease in VO2 stacking layer number n and the increase in the interlayer distance between the (VO2)n layers resulted in metal-to-insulator transition. The sheet conductance of a single (VO2)n layer in Srn+1VnO3n+1 (n = 1, 2) was close to the well-known Ioffe-Regel limit, which suggests their two-dimensional electrical conduction. From resistivity and magnetoconductance measurements, it is found that renormalized electron-electron interaction and/or the Kondo effect were enhanced with the decrease in n, and possible quantum interference effects like weak localization were induced with the increase in the interlayer distance.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)