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Crossover of conduction mechanism in Sr2IrO4 epitaxial thin films
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Lu, Chengliang, Quindeau, Andy, Hakan, Deniz, Preziosi, Daniele, Hesse, Dietrich and Alexe, M. (Marin) (2014) Crossover of conduction mechanism in Sr2IrO4 epitaxial thin films. Applied Physics Letters, Volume 105 (Number 8). 082407. doi:10.1063/1.4894465 ISSN 0003-6951.
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Official URL: http://dx.doi.org/10.1063/1.4894465
Abstract
High quality epitaxial Sr2IrO4 thin films with various thicknesses (9-300 nm) have been grown on SrTiO3 (001) substrates, and their electric transport properties have been investigated. All samples shown expected insulating behavior with a strong resistivity dependence on the film thickness, that can be as large as 3 orders of magnitude at low temperature. A close examination of the transport data revealed interesting crossover behaviors for the conduction mechanism upon variation of thickness and temperature. While Mott variable range hopping (VRH) dominated the transport for films thinner than 85 nm, high temperature (>200 K) thermal activation behavior was observed for films with large thickness (≥85 nm), which was followed by a crossover from Mott to Efros-Shklovskii (ES) VRH in the low temperature range. This low temperature crossover from Mott to ES VRH indicates the presence of a Coulomb gap (~3 meV). Our results demonstrated the competing and tunable conduction in Sr2IrO4 thin films, which in turn might be helpful for understanding the insulating nature related to strong spin-orbital-coupling of the 5d iridates.
Item Type: | Journal Article | ||||||||
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Subjects: | Q Science > QC Physics | ||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
Library of Congress Subject Headings (LCSH): | Epitaxy, Thin films, Electric conductivity, Nuclear spin | ||||||||
Journal or Publication Title: | Applied Physics Letters | ||||||||
Publisher: | American Institute of Physics | ||||||||
ISSN: | 0003-6951 | ||||||||
Official Date: | 28 August 2014 | ||||||||
Dates: |
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Volume: | Volume 105 | ||||||||
Number: | Number 8 | ||||||||
Article Number: | 082407 | ||||||||
DOI: | 10.1063/1.4894465 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||
Date of first compliant deposit: | 28 December 2015 | ||||||||
Date of first compliant Open Access: | 28 December 2015 | ||||||||
Funder: | Deutsche Forschungsgemeinschaft (DFG), Alexander von Humboldt-Stiftung (AvHS), Guo jia zi ran ke xue ji jin wei yuan hui (China) [National Natural Science Foundation of China] (NSFC), Royal Society (Great Britain) | ||||||||
Grant number: | 11104090 (NSFC), 11374112 (NSFC) |
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