Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session B30: Metal-Insulator Transitions: Experiment
11:30 AM–2:18 PM,
Monday, March 6, 2023
Room: Room 222/223
Sponsoring
Unit:
DCMP
Chair: Tika R Kafle, JILA, UCB
Abstract: B30.00001 : Quantifying Joule heating in voltage-biased VO2 thin films using atomic force microscopy*
11:30 AM–11:42 AM
Presenter:
Jason D Hoffman
(Harvard)
Authors:
Jason D Hoffman
(Harvard)
Alyson Spitzig
(Harvard University)
Dilek Yildiz
(Harvard University)
Jennifer Hoffman
(Harvard University)
Here we first use an atomic force microscope (AFM) in contact mode to map the local current response of voltage-biased polycrystalline VO2 thin films. We fit the I-V curve to the temperature-dependent Poole-Frenkel conduction mechanism and calculate the local temperature of the film to be 337 K immediately preceding the transition, confirming the role of Joule heating.1
Secondly, we use non-contact AFM (nc-AFM), in which an oscillating sensor detects the local force and power dissipation between the tip and VO2 film sample. As we ramp the sample bias, we observe a rise and subsequent drop in the power dissipated, indicating the film has switched to the metallic state. Our pre-transition dissipation curve fits well to Joule heating, suggesting a temperature-triggered IMT.
1 Spitzig et al. APL 120, 151602 (2022)
*This work is supported by the Center for Integrated Quantum Materials (NSF Grant No. DMR-1231319)
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