Physical origins of current and temperature controlled negative differential resistances in NbO2

Kumar, Suhas; Wang, Ziwen; Davila, Noraica; Kumari, Niru; Norris, Kate J.; Huang, Xiaopeng; Strachan, John Paul; Vine, David; Kilcoyne, A. L.  David; Nishi, Yoshio; Williams, R. Stanley

doi:10.1038/s41467-017-00773-4

Title: Physical origins of current and temperature controlled negative differential resistances in NbO₂

Journal Article · Fri Sep 22 00:00:00 EDT 2017 · Nature Communications

DOI:https://doi.org/10.1038/s41467-017-00773-4· OSTI ID:1416938

Kumar, Suhas ^[1]; Wang, Ziwen ^[2]; Davila, Noraica ^[1]; Kumari, Niru ^[1]; Norris, Kate J. ^[1]; Huang, Xiaopeng ^[1]; Strachan, John Paul ^[1]; Vine, David ^[3];

^[3]; Nishi, Yoshio ^[3]; Williams, R. Stanley ^[1]

Hewlett Packard Labs, Palo Alto, CA (United States)
Stanford Univ., CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Negative differential resistance behavior in oxide memristors, especially those using NbO₂, is gaining renewed interest because of its potential utility in neuromorphic computing. However, there has been a decade-long controversy over whether the negative differential resistance is caused by a relatively low-temperature non-linear transport mechanism or a high-temperature Mott transition. Resolving this issue will enable consistent and robust predictive modeling of this phenomenon for different applications. Here in this paper, we examine NbO₂ memristors that exhibit both a current-controlled and a temperature-controlled negative differential resistance. Through thermal and chemical spectromicroscopy and numerical simulations, we confirm that the former is caused by a ~400 K non-linear-transport-driven instability and the latter is caused by the ~1000 K Mott metal-insulator transition, for which the thermal conductance counter-intuitively decreases in the metallic state relative to the insulating state.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Science Foundation (NSF)

Grant/Contract Number:: AC02-05CH11231; 2017-17013000002; ECS-9731293

OSTI ID:: 1416938

Journal Information:: Nature Communications, Vol. 8, Issue 1; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 90 works

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