title: Extreme chemical sensitivity of nonlinear conductivity in charge-ordered LuFe(2)O(4).
abstract: Nonlinear transport behaviors are crucial for applications in electronic technology. At the nonlinear critical turning point, the nonequilibrium states cause rich physics responses to environment. The corresponding study in this field is crucial for physics and industry application. Here nonlinear conductivity in charge-ordered (CO) LuFe(2)O(4 )has been demonstrated. Remarkable resistivity switching behavior was observed and the gas-sensing property can be reversibly tuned by a small alternation of partial pressure and/or chemical components of the environment. These facts allow us to use LuFe(2)O(4) materials as a sensitive chemical gas sensor in technological applications. Careful analysis of the gas sensing process in LuFe(2)O(4) suggests a novel sensing mechanism in sharp contrast with that discussed for the conventional gas sensors which depend fundamentally on surface chemical reactions.
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics , Chinese Academy of Sciences, Beijing 100190, P. R. China.
authors.forename: Shi
authors.initials: S
authors.lastname: Cao
authors.forename: Jun
authors.initials: J
authors.lastname: Li
authors.forename: Zhen
authors.initials: Z
authors.lastname: Wang
authors.forename: Huanfang
authors.initials: H
authors.lastname: Tian
authors.forename: Yuanbin
authors.initials: Y
authors.lastname: Qin
authors.forename: Lunjie
authors.initials: L
authors.lastname: Zeng
authors.forename: Chao
authors.initials: C
authors.lastname: Ma
authors.forename: Huaixin
authors.initials: H
authors.lastname: Yang
authors.forename: Jianqi
authors.initials: J
authors.lastname: Li