Structural, transport, and ultrafast dynamic properties of V1-xNbxO2 thin films

Wang, Yuhan1,2; Zhang, Jiawei3; Ni, Yue3; Chen, Xinzhong3; Mescall, Ryan3; Isaacs-Smith, Tamara4; Comes, Ryan B.4; Kittiwatanakul, Salinporn1,5; Wolf, Stuart A.1,6; Lu, Jiwei1; Liu, Mengkun3,7

2019-06-14

10.1103/PhysRevB.99.245129

PHYSICAL REVIEW B   影响因子和分区

2469-9950

2469-9969

We report the coherent study of structural, transport, and ultrafast dynamic properties of V1-xNbxO2 thin films. Films of a solid solution of V1-xNbxO2 (0 <= x <= 1) are prepared on (0001) sapphire substrates using reactive target bias ion beam deposition. We found that, at room temperature, the low-temperature lattice symmetry of pure VO2 (monoclinic, P2(1)/c) and NbO2 (tetragonal, I4(1)/a) is only maintained at low substituting levels (x < 0.1 and x > 0.9) and regular rutile lattices are adopted by films with higher substituting levels (0.1 < x < 0.9). We characterized the dc transport properties and the photoinduced ultrafast dynamics at the terahertz frequency range, both of which demonstrate strong dependence on the film composition. At x similar to 0.5, both the dc conductivity and ultrafast response diminish, which corresponds to a strong localization of free charge carriers in the system. The strong composition dependence of film transport, ultrafast dynamic, and insulator-metal transition properties promises approaches to improve the performance of devices based on transition metal oxides.

SCI ; EI

英语

其他

Materials Science ; Physics

Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter

WOS:000471984000001

AMER PHYSICAL SOC

20192907193016

Crystal lattices ; Ion beam assisted deposition ; Ion beams ; Metal insulator transition ; Niobium oxide ; Oxide minerals ; Sapphire ; Temperature ; Titanium dioxide ; Transition metal oxides ; Transition metals ; Vanadium dioxide

Minerals:482.2 ; Gems:482.2.1 ; Metallurgy and Metallography:531 ; Thermodynamics:641.1 ; Chemical Products Generally:804 ; Inorganic Compounds:804.2 ; High Energy Physics:932.1 ; Crystal Lattice:933.1.1

PHYSICS

Web of Science

1.Univ Virginia, Dept Mat Sci & Engn, Charlottesville, VA 22904 USA
2.Nanjing Univ, Sch Elect Sci & Engn, Nanjing 210023, Jiangsu, Peoples R China
3.SUNY Stony Brook, Dept Phys, Stony Brook, NY 11794 USA
4.Auburn Univ, Dept Phys, Auburn, AL 36849 USA
5.Chulalongkorn Univ, Fac Sci, Dept Phys, Bangkok 10330, Thailand
6.Univ Virginia, Dept Phys, Charlottesville, VA 22904 USA
7.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China

Wang, Yuhan,Zhang, Jiawei,Ni, Yue,et al. Structural, transport, and ultrafast dynamic properties of V1-xNbxO2 thin films[J]. PHYSICAL REVIEW B,2019,99(24).

Wang, Yuhan.,Zhang, Jiawei.,Ni, Yue.,Chen, Xinzhong.,Mescall, Ryan.,...&Liu, Mengkun.(2019).Structural, transport, and ultrafast dynamic properties of V1-xNbxO2 thin films.PHYSICAL REVIEW B,99(24).

Wang, Yuhan,et al."Structural, transport, and ultrafast dynamic properties of V1-xNbxO2 thin films".PHYSICAL REVIEW B 99.24(2019).