Emergence of Griffiths phase and glassy mixed phase in Sm0.5Ca0.5MnO3 nanomanganites
作者： S.K. Giri , S.M. Yusuf , M.D. Mukadam , T.K. Nath
DOI: 10.1016/J.JALLCOM.2013.12.076
关键词: Spin glass 、 Antiferromagnetism 、 Magnetization 、 Materials science 、 Condensed matter physics 、 Magnetic susceptibility 、 Relaxation (NMR) 、 Spontaneous magnetization 、 Curie temperature 、 Phase (matter)
摘要: Abstract A detailed investigation on the effect of grain size formation Griffiths phase (GP), and glassy mixed in CE-type antiferromagnetic Sm0.5Ca0.5MnO3 manganite are carried out. rigorous measurement linear non-linear ac magnetic susceptibilities, time dependent relaxation aging phenomena nanomanganite confirm existence a low temperature regime. strong evidence GP has been identified nanomanganites having ferromagnetic spin–spin correlation above Curie (TC) without possessing any spontaneous magnetization. The signature nanosized confirmed from dc magnetization studies. is verified through anomalous behavior field susceptibility (χ) – viz., an inverse characterized by χ - 1 = ( T C Rand ) λ with λ = 0.85 ± 0.02. Based experimental results, attributed to separation interaction between clusters. phenomenological core/shell like model also proposed based surface disorder explain observed GP-like properties these manganites.
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