Enhanced ferromagnetism and glassy state in phase separated La0.95Sr0.05MnO3 + δ

Unusual high temperature ferromagentism is reported for La0.95Sr0.05MnO3+δ with Curie temperatures (TC1 and TC2) TC1 at 290 K and TC2 ∼ 150 K. Weak antiferromagnetism (AFM) is thought to give low moment, low temperature irreversibility, and non-saturation up to 10 T at 5 K. A short-range ferromagnet...

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Detalhes bibliográficos
Autor principal: De, K. (author)
Outros Autores: Das, S. (author), Roy, A. (author), Dhak, P. (author), Willinger, M. (author), Amaral, J. S. (author), Amaral, V. S. (author), Giri, S. (author), Majumder, S. (author), Silva, Carlos J. R. (author), Gomes, M. J. M. (author), Mahapatra, P. K. (author)
Formato: article
Idioma:eng
Publicado em: 2012
Assuntos:
Anti-ferromagnetic materials
Science & Technology
Texto completo:http://hdl.handle.net/1822/22240
País:Portugal
Oai:oai:repositorium.sdum.uminho.pt:1822/22240
Descrição
Resumo:Unusual high temperature ferromagentism is reported for La0.95Sr0.05MnO3+δ with Curie temperatures (TC1 and TC2) TC1 at 290 K and TC2 ∼ 150 K. Weak antiferromagnetism (AFM) is thought to give low moment, low temperature irreversibility, and non-saturation up to 10 T at 5 K. A short-range ferromagnetism is predicted from well-defined hysteresis at 5 K and field-cooled (FC) magnetization curves. Strong irreversibility between zero field-cooled (ZFC) and FC at 5 T is due to “hard” spins, not from ferromagnetic clusters. Field-dependent peak shift of spin freezing temperature in ZFC, memory effect, magnetic relaxation shows cluster glass like transition in the system. A metal-insulator transition at 115 K also implies a completion of percolation of short range ferromagnetic clusters, giving an onset of metallic state at 115 K. A complete magnetic phase diagram is presented showing its temperature dependent rich magnetic behavior.

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