Charge ordering melting and evidence for a metastable antiferromagnetic phase inJiyu Fan, Li Pi, Kuang He, Wenqin Wang and Yuheng Zhang
Hefei High Magnetic Field Laboratory, University of Science and Technology of China Hefei 230026, PRC
received 23 March 2005; accepted in final form 9 March 2006
published online 7 April 2006
The magnetic properties and stability in ( ) polycrystalline manganites have been studied. We find that the Ti-dopant causes the melting of the charge ordering state and the presence of the short-range antiferromagnetic phase. The electron-spin resonance spectra and M(H) hysteresis loops reveal that the antiferromagnetic coupling is weakened rather than strengthened upon temperature decreases. The short-range antiferromagnetic phase is metastable and transforms into the stable ferromagnetic state.
75.47.Lx - Manganites.
64.60.My - Metastable phases.
75.50.Ee - Antiferromagnetics.
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