TITLE

Evidence of electronic phase separation in Er[sup 3+]-doped La[sub 0.8]Sr[sub 0.2]MnO[sub 3]

AUTHOR(S)
Ravindranath, V.; Rao, M. S. Ramachandra; Suryanarayanan, R.; Rangarajan, G.
PUB. DATE
April 2003
SOURCE
Applied Physics Letters;4/28/2003, Vol. 82 Issue 17, p2865
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Er[SUP3+] doping at the La site in La[SUB0.8]Sr[SUB0.2]MnO[SUB3] showed an unusual increase in Curie/peak resistivity temperature (T[SUBC]/T[SUBP]) above a certain nominal dopant concentration (x ⩾ 0.086). This increase is attributed to the presence of a cation-deficient ErMnO[SUB3] phase. Further, with increase in T[SUBP] the overall resistivity of these compounds also decreases. We explain these results assuming the presence of a nanoscale mixture of charge-ordered antiferromagnetic insulating (CO-AFMI) phase in a ferromagnetic metallic matrix, wherein the increase in T[SUBC]/T[SUBP] with increase in Er[SUP3+] content is due to the local destruction of the CO-AFMI phase by the presence of the cation-deficient ErMnO[SUB3] phase. We thus provide an indirect evidence of electronic phase separation in these compounds.
ACCESSION #
9555489

 

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