https://doi.org/10.1140/epjb/e2003-00053-3
Magnetic anisotropy of an extended double exchange model for layered manganites: A Monte Carlo study
Supercomputing Center, Korea Institute of Science and Technology Information, Yuseong, PO Box
122, Daejeon 305-600, Korea
Corresponding author: a hsyi@hpcnet.ne.kr
Received:
1
October
2002
Published online:
6
March
2003
The magnetic ground state properties of layered manganites are
investigated on the basis of an anisotropic double exchange model
using a Monte Carlo technique. The temperature dependence of
magnetization and spin-spin correlations are calculated in a
highly anisotropic hopping integral 
regime. The
ferromagnetic ordering temperature (Tc) is suppressed by
introducing , and eventually a layered ferromagnetic
structure appears along the c-axis, but there are block-walls.
The significant change of magnetic anisotropy is also observed for
the antiferromagnetic superexchange integral 
. We
discuss the connection of these results to the magnetic anisotropy
observed in the La1.4Sr1.6Mn2O7.
PACS: 75.50.Cc – Other ferromagnetic metals and alloys / 75.30.Et – Exchange and superexchange interactions / 75.30.-m – Intrinsic properties of magnetically ordered materials / 72.10.-d – Theory of electronic transport; scattering mechanisms
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2003
