mno6 octahedron
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2005 ◽  
Vol 475-479 ◽  
pp. 2227-2230
Author(s):  
J. Feng ◽  
Q.B. Bo ◽  
P. Che ◽  
J.P. Wang ◽  
M.F. Lu ◽  
...  

The layered manganese oxides LaSr2Mn2-xTxO7 (T=Fe, Cr and Ni) has been prepared. The effect of substitution of transition metal ions for Mn on magnetic and magtoresistance properties has been studied. The compound has a tetragonal symmetry and the lattice parameters a decreases with increasing the doped content but the parameter c increases with x. It indicates that the MnO6 octahedron increase the distortion with x content. With the x increase, their ferromagnetic property was depressed. The Neel temperature TN was depressed gradually from 138K to 89K, 95K and 85K at x=0.3 for T=Fe, Ni and Cr respectively. Their magnetoresistance MR is gradually enhanced for all doped system. It suggests that the introduce of disorder in B-site have an important effect on the magnetic exchange and magnetoresistance because of the weaken of the double-exchange (DE) interaction.


2004 ◽  
Vol 108 (48) ◽  
pp. 18547-18551 ◽  
Author(s):  
Y. J. Wei ◽  
L. Y. Yan ◽  
C. Z. Wang ◽  
X. G. Xu ◽  
F. Wu ◽  
...  
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