Issue |
Europhys. Lett.
Volume 62, Number 5, June 2003
|
|
---|---|---|
Page(s) | 732 - 738 | |
Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
DOI | https://doi.org/10.1209/epl/i2003-00434-8 | |
Published online | 01 May 2003 |
Presence of a paramagnetic phase well
below the ferromagnetic onset in
x
1
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
Received:
21
January
2003
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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