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Metal-insulator transition in doped Ca2RuO4: Potential application in bolometric detection

Fobes, D; Vehstedt, E; Peng, J; Wang, GC; Liu, TJ; Mao, ZQ; (2012) Metal-insulator transition in doped Ca2RuO4: Potential application in bolometric detection. Journal of Applied Physics , 111 (8) , Article 083709. 10.1063/1.4704387.

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Abstract

We report that the first-order metal-insulator (MI) transition in perovskite ruthenateCa2RuO4 can be tuned to a nearly second order transition with the transition temperature close to room temperature via Sr, Ti, and Fe chemical doping. The resistivity near this transition ranges from 10−2−10−1Ω-cm. The maximum temperature coefficient of resistance TCR(= −(1/R)dR/dT near the transition exceeds 0.4 K− 1. This MI transition can also be tuned by a relatively small bias-current. These properties suggest that doped calcium ruthenates can be considered an alternative material for improving upon existing bolometric technologies.

Type: Article
Title: Metal-insulator transition in doped Ca2RuO4: Potential application in bolometric detection
DOI: 10.1063/1.4704387
Publisher version: http://dx.doi.org/10.1063/1.4704387
Language: English
Keywords: Doping, Electrical resistivity, Metal insulator transitions, Bolometers, Ruthenates
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: http://discovery.ucl.ac.uk/id/eprint/1464305
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