Metal-insulator transition in doped Ca 2RuO 4: Potential application in bolometric detection

D. Fobes, E. Vehstedt, J. Peng, G. C. Wang, T. J. Liu, Zhiqiang Mao

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Abstract

We report that the first-order metal-insulator (MI) transition in perovskite ruthenate Ca 2 RuO 4 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 - 1 -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.

Original languageEnglish (US)
Article number083709
JournalJournal of Applied Physics
Volume111
Issue number8
DOIs
Publication statusPublished - Apr 15 2012

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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