Journal
NANO LETTERS
Volume 9, Issue 12, Pages 4001-4006Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl902167b
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Funding
- National Science Foundation [EEC-0425914]
- Lawrence Berkeley National Laboratory (LBNL) under the Department of Energy [DE-AC02-05CH11231]
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We report on measurements of Seebeck effect in single-crystal VO2 microbeams across their metal-insulator phase transition. One-dimensionally aligned metal-insulator domain walls were reversibly created and eliminated along single VO2 beams by varying temperature, which allows for accurate extraction of the net contribution to the Seebeck effect from these domain walls. We observed significantly lower Seebeck coefficient in the metal-insulator coexisting regime than predicted by a linear combination of contributions from the insulator and metal domains. This indicates that the net contribution of the domain walls has an opposite sign from that of the insulator and metal phases separately. Possible origins that may be responsible for this unexpected effect were discussed in the context of complications in this correlated electron material.
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