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The effect of Cu-doping on the magnetic and transport properties of La0.7Sr0.3MnO3 | | M. S. Kim
; J. B. Yang Q. Cai
; X. D. Zhou
; W. J. James
; W. B. Yelon
; P. E. Parris
; D. Buddhikot
; S. K. Malik
; | | Date: |
9 Feb 2005 | | Subject: | Materials Science; Other | cond-mat.mtrl-sci cond-mat.other | | Affiliation: | 1,2), J. B. Yang (1,2) Q. Cai , X. D. Zhou , W. J. James (2,3), W. B. Yelon (2,3), P. E. Parris , D. Buddhikot and S. K. Malik ( Department of Physics, University of Missouri-Rolla, Rolla, USA Graduate Center for Materials Research, University of Mi | | Abstract: | The effects of Cu-doping on the structural, magnetic, and transport properties of La0.7Sr0.3Mn1-xCuxO3 (0 < x < 0.20) have been studied using neutron diffraction, magnetization and magnetoresistance (MR) measurements. All samples show the rhombohedral structure with the R3c space-group from 10K to room temperature (RT). Neutron diffraction data suggest that some of the Cu ions have a Cu3+ state in these compounds. The substitution of Mn by Cu affects the Mn-O bond length and Mn-O-Mn bond angle resulting from the minimization of the distortion of the MnO6 octahedron. Resistivity measurements show that a metal to insulator transition occurs for the x more than 0.15 samples. The x = 0.15 sample shows the highest MR(_80%), which might result from the co-existence of Cu3+/Cu2+ and the dilution effect of Cu-doping on the double exchange interaction. | | Source: | arXiv, cond-mat/0502225 | | Services: | Forum | Review | PDF | Favorites | |
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