文献类型：期刊文献

英文题名：Thermal evidences for multi-domain coexistence of freestanding VO2 crystalline microbeams with insulator-insulator transitions

作者：Zhang, Sunyuan[1];Wu, Binhe[1];Wang, Chunrui[1];Zhou, Jian[2];Sun, Hao[2];Cao, Wenhan[3];Yu, Huimei[4]

机构：[1]Donghua Univ, Coll Phys, 2999 North Renmin Rd, Shanghai 201620, Peoples R China;[2]Chinese Acad Sci, Shanghai Inst Microsyst & Informat Technol, 865 Changning Rd, Shanghai 200050, Peoples R China;[3]ShanghaiTech Univ, Sch Informat Sci & Technol, 393 Middle Huaxia Rd, Shanghai 201210, Peoples R China;[4]East China Univ Sci & Technol, Sch Mat Sci & Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2025

卷号：126

期号：12

外文期刊名：APPLIED PHYSICS LETTERS

收录：;EI(收录号：20251318147013);WOS:【SCI-EXPANDED(收录号:WOS:001456421900003)】；

基金：This work was supported by the Natural Science Foundation of Shanghai (No. 24ZR1402600) and the National Natural Science Foundation of China (Nos. 61975029, 62205204, and 62375172). The authors would like to express their sincere gratitude to Xiamen High-End MEMS Technology Co., Ltd. for providing the chip-DSC testing equipment and to Professor Dr. Xinxin Li, Professor Dr. Pengcheng Xu, and Dr. Haitao Yu for their support during the testing process.

语种：英文

外文关键词：Crystalline materials - Differential thermal analysis - Electric insulators - Insulating materials - Insulation - Latent heat - Metal insulator boundaries - Metal insulator transition - Thermogravimetric analysis - Vanadium pentoxide

摘要：Vanadium dioxide (VO2) exhibits multiple insulating states and complex transitions, both among these states and to a metallic rutile (R) phase. In this study, we investigate freestanding VO2 microbeams that undergo reversible transitions from an insulating triclinic (T) phase to an insulating monoclinic (M-2) phase, followed by a transition to the R phase. The latent heat changes associated with these first-order phase transitions are monitored using a recently developed chip-based differential scanning calorimetry technique, which demonstrates exceptional sensitivity and resolving power. A series of sharp endothermic and exothermic peaks are observed during the temperature ramping process. In contrast to the abrupt and complete transformation typically observed in conventional insulator-to-metal transitions, our findings reveal a scenario in which multiple domains coexist, and phase transitions occur sequentially within each domain. These results underscore the intricate relationship between domain dynamics and the multiple phase structures in VO2. Furthermore, they highlight the potential of advanced thermal analysis techniques to detect subtle thermal signals associated with phase transition processes, providing fresh insights into the underlying mechanisms.