Volume 62, Number 5, June 2003
|Page(s)||732 - 738|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 May 2003|
Presence of a paramagnetic phase well below the ferromagnetic onset in x
State Key Laboratory for Magnetism, Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences - Beijing 10080, PRC
2 Department of Physics, the Hong Kong University - Pokfulam Road, Hong Kong, PRC
3 Australian Nuclear Science and Technology Organization, Lucas Heights, Laboratories Menai 2234, Australia
4 Department of Physics, Sichuan University - Chengdu 19904, PRC
Accepted: 4 April 2003
Partial replacement of by in depresses the ferromagnetic order of the compound and leads to a stepwise magnetic behavior characterized by two subsequent transitions at and . Based on a combined study of the electron spin resonance spectra and the thermal and isothermal magnetization, a complete scenario for the phase separation that causes the complex behavior has been given. It is found that the paramagnetic phase exists in a wide temperature region even below the ferromagnetic onset at . It coexists with the ferromagnetic phase below and with both the ferromagnetic and antiferromagnetic phases below with a reduced but significant fraction. The magnetization jump at is possibly a conversion of the remaining paramagnetic phase into the ferromagnetic phase.
PACS: 75.50.Dd – Nonmetallic ferromagnetic materials / 76.30.-v – Electron paramagnetic resonance and relaxation / 75.30.Vn – Colossal magnetoresistance
© EDP Sciences, 2003
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