Journal
PHYSICAL REVIEW B
Volume 79, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.184407
Keywords
band model of magnetism; cobalt compounds; ferromagnetic materials; lanthanum compounds; magnetic susceptibility; magnetisation; renormalisation; spin fluctuations
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 [19350030, 16076210] Funding Source: KAKEN
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We synthesized weakly itinerant ferromagnet with layered structure LaCoAsO and measured the isothermal magnetizations at various temperatures. The isothermal magnetizations in a form of Arrott plot for weakly itinerant ferromagnets such as ZrZn2, Sc3In, Ni3Al, and Y(Co,Al)(2) shows parallel linear relation over the wide temperature range near the Curie temperature T-C, while for LaCoAsO the square of the magnetization M-2 was found to show a convex curvature against H/M, similar to MnSi and FexCo1-xSi. We analyzed the magnetization of LaCoAsO at T-C and estimated several parameters of spin fluctuations on the basis of self-consistent renormalization theory of spin fluctuations. We simulated a reciprocal magnetic susceptibility above T-C and discussed the nature of spin fluctuations in LaCoAsO.
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