Enhanced piezoresistive characteristics of Nb2O5 modified La0.8Sr0.2MnO3 ceramics

Vaneet Sharma, Maria R. Hossu, Woo Ho Lee, Ali R. Koymen, Shashank Priya

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Abstract

This letter reports the giant piezoresistance phenomenon in Nb2 O5 modified La0.8 Sr0.2 Mn O3 (LSMO) polycrystalline ceramics. LSMO modified with 2 mol % Nb exhibited ∼2% change in resistivity at 19.2 MPa pressure as compared to 0.5% for the pure LSMO. A dramatic improvement was obtained for 5 mol % Nb-modified LSMO composition, which exhibited a linear change in resistivity with uniaxial stress and the fractional change was of the order of 3% at 19.2 MPa stress. The origin of the giant piezoresistance was found to be related to Nb substitution on the Mn sites which distorts the Mn-O bond, lowering the magnitude of stress required for the manganite lattice transformation.

Original languageEnglish (US)
Article number202902
JournalApplied Physics Letters
Volume89
Issue number20
DOIs
StatePublished - Nov 23 2006

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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