Journal
PHYSICAL REVIEW B
Volume 80, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.184409
Keywords
antiferromagnetic materials; cerium compounds; cobalt compounds; Curie temperature; exchange interactions (electron); ferromagnetic materials; ferromagnetic-antiferromagnetic transitions; gadolinium compounds; lanthanum compounds; lattice constants; magnetisation; neodymium compounds; praseodymium compounds; samarium compounds
Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan [16076210]
- Japan Society for Promotion of Science [19350030]
- Japan Society for the Promotion of Science for Young Scientists
- Grants-in-Aid for Scientific Research [16076210, 19350030] Funding Source: KAKEN
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We synthesized a series of CoAs based weakly itinerant ferromagnetic compound LCoAsO (L: lanthanoids) and systematically studied a L dependence on magnetic properties. Lattice constants a and c decrease monotonically with the decrease in the ion size of L3+. In the cases of L=Nd, Sm, and Gd, a ferromagnetic-antiferromagnetic transition was observed at T-N=15, 35, and 75 K, respectively, indicating the existence of unconventional interaction between ferromagnetically ordered itinerant electrons of Co. The Curie temperature T-C increases from 55 to 75 K by changing La to Ce while from Ce to Gd the T-C does not change so much, being quite similar to the L site dependence of the superconducting transition temperature T-c in FeAs-based high-T-c compound LFeAsO. We discussed the mechanism of ferromagnetic-antiferromagnetic transition and the lanthanoid dependence of T-C.
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