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Science 13 October 1995:
Vol. 270. no. 5234, pp. 273 - 275
DOI: 10.1126/science.270.5234.273
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Reports

A Class of Cobalt Oxide Magnetoresistance Materials Discovered with Combinatorial Synthesis

Gabriel Briceño,  Hauyee Chang,  Xiaodong Sun,  Peter G. Schultz (1),  X. -D. Xiang (1)

The recent development of methods for generating libraries of solid-state compounds has made it possible to apply combinatorial approaches to the discovery of materials. A library of 128 members containing different compositions and stoichiometries of LnMCoO, where Ln = Y or La and M = Pb, Ca, Sr, or Ba, was synthesized by a combination of thin-film deposition and physical masking techniques. Large magnetoresistance has been found in La(Ba,Sr,Ca)-CoO samples, whereas Y-based samples exhibit much smaller magnetoresistive effects. The magnetoresistance of the Co-containing compounds increases as the size of the alkaline earth ion increases, in sharp contrast to Mn-containing compounds, in which the magnetoresistance effect increases as the size of the alkaline earth ion decreases.

G. Briceño and X.-D. Xiang, Molecular Design Institute, Lawrence Berkeley Laboratory, Berkeley, CA 94720, USA.  H. Chang, X. Sun, P. G. Schultz, Molecular Design Institute, Lawrence Berkeley Laboratory, Howard Hughes Medical Institute, and Department of Chemistry, University of California, Berkeley, CA 94720, USA.  
(1) To whom correspondence should be addressed. 


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