Volume 34, Number 8, June II 1996
|Page(s)||623 - 628|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Suppression of weak ferromagnetism in small particles of Gd2CuO4
Departamento de Física Aplicada, Universidade de
E-15706 Santiago de Compostela, Spain
2 Departamento de Química-Física, Universidade de Santiago, E-15706 Santiago de Compostela, Spain
3 Centro Atómico Bariloche and Instituto Balseiro, 8400 San Carlos de Bariloche, Argentina
4 Physics Department, San Diego State University - 92182 San Diego, USA
Accepted: 25 April 1996
particles were synthesized by sol-gel techniques in order to study the effects of particle size d on the magnetic properties measured by dc magnetization and microwave absorption. Decreasing d reduced the intensity and temperature of onset of weak ferromagnetism, which was not detected at all in 850 particles. This finding is attributed to the impossibility of Cu three-dimensional antiferromagnetic ordering when d reaches a limit somewhat below the two-dimensional magnetic correlation length corresponding to bulk at the Néel temperature.
PACS: 75.50.Tt – Fine-particle systems / 75.30.Kz – Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.) / 76.50.+g – Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance
© EDP Sciences, 1996
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