TITLE

Effect of Li doping on the magnetotransport properties of La[sub 0.7]Ca[sub 0.3-y]Li[sub y]MnO[sub 3] system: Decrease of metal–insulator transition temperature

AUTHOR(S)
Bhattacharya, Sayani; Mukherjee, R. K.; Chaudhuri, B. K.; Yang, H. D.
PUB. DATE
June 2003
SOURCE
Applied Physics Letters;6/9/2003, Vol. 82 Issue 23, p4101
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
With increasing the Li doping level in La[SUB0.7]Ca[SUB0.3-y]Li[SUBy]MnO[SUB3] (0⩽y⩽0.3), the system is driven from a higher-conductivity regime to a lower-conductivity regime, which is in sharp contrast with the behavior of Na or K doping. Compared to those of K or Na, the ionic radius of Li is much smaller than that of Ca. Therefore, substitution of Ca by Li results in a smaller average A-site radius, narrowing the bandwidth and hence enhancing the band gap and resistivity. The effect of random disorder of La[SUP3+] and A[SUP2+] also plays an important role leading to charge localization.
ACCESSION #
9924690

 

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