Transition from N-Type to P-Type Destroys Ferromagnetism in Semiconducting Sn_1-XCo_xO₂ and Sn_1-XCr_xO₂ Nanoparticles

Authors

C. Van Komen, Boise State University
A. Punnoose, Boise State UniversityFollow
M. S. Seehra, West Virginia University

Document Type

Article

Publication Date

12-2009

Abstract

This work reports strong correlations between the structural, magnetic and electronic properties of room temperature ferromagnets (RTFM) Sn_1-xCo_xO₂ and Sn_1-xCr_xO₂ for x = 0 to 0.1. The samples prepared by the sol-gel chemical method show RTFM for x < x_L with the limiting concentration x_L = 0.01 for Co doping and x_L = 0.025 for Cr doping. As doping level x is increased from x = 0, the magnetic moment per ion, μ, increases and the lattice volume V_L decreases up to _x = x_L. For x > x_L, μ dramatically decreases toward zero and V_L increases, the latter suggesting interstitial doping. Thermoelectric measurements showed that the samples are n-type for x < x_L and p-type for x > x_L, suggesting that the RTFM is intrinsic and it is electron mediated.

Copyright Statement

This is an author-produced, peer-reviewed version of this article. © 2009, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (https://creativecommons.org/licenses/by-nc-nd/4.0/). The final, definitive version of this document can be found online at Solid State Communications, doi: 10.1016/j.ssc.2009.08.039

Publication Information

Van Komen, C.; Punnoose, A.; and Seehra, M. S.. (2009). "Transition from N-Type to P-Type Destroys Ferromagnetism in Semiconducting Sn_1-XCo_xO₂ and Sn_1-XCr_xO₂ Nanoparticles". Solid State Communications, 149(47-48), 2257-2259. http://dx.doi.org/10.1016/j.ssc.2009.08.039