2024-03-29T15:33:01Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00005534
2023-01-16T04:29:41Z
320:321:322
Two-dimensional ferromagnetic ordering and magnetoresistance in the layered perovskite La_{2-2x}Ca_{1+2x}Mn_2O_7
Asano, H.
14349
Hayakawa, J.
14350
Matsui, M.
14351
The resistivity and magnetization of layered perovskite La_{2-2x}Ca_{1+2x}Mn_2O_7 have been studied systematically using bulk samples with a wide doping concentration range 0≼x≼0.5 and epitaxial thin film samples with x=0.3. The system becomes a metallic ferromagnet for doping concentrations 0.22≼x≼0.5. In this doping region, results for bulk samples as well as for thin films have clearly shown that there are two types of ferromagnetic ordering, possibly originating from an anisotropic exchange interaction. Magnetoresistance is observed over a wide temperature range below the ferromagnetic ordering temperatures. Based on these results, a model of temperature-dependent spin ordering is presented for a double perovskite ferromagnet, which suggests that there is a two-dimensional ferromagnetic alignment at temperatures between the two ordering temperatures.
journal article
The American Physical Society
1997-09
application/pdf
Physical Review B
9
56
5395
5403
http://hdl.handle.net/2237/7141
1098-0121
https://nagoya.repo.nii.ac.jp/record/5534/files/p5395_1.pdf
eng
https://doi.org/10.1103/PhysRevB.56.5395
Copyright: American Physical Society, All rights reserved.