Details

Autor(en) / Beteiligte

• Pillai, S Savitha
• Rangarajan, G
• Raju, N P
• Epstein, A J
• Santhosh, P N

Titel

Coexistence of ferromagnetic and antiferromagnetic phases in Nd0.5CaxSr0.5−xMnO3 manganites

Ist Teil von

• Journal of physics. Condensed matter, 2007-12, Vol.19 (49), p.496221-496221 (12)

Ort / Verlag

Bristol: IOP Publishing

Erscheinungsjahr

2007

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• We have investigated the spontaneous magnetization exhibited in Nd0.5CaxSr0.5-xMnO3 (x = 0.,0.,0.3 and 0.4) (NCSMO) samples by measurements of magnetization and electron spin resonance. As like end members, the samples crystallize in an orthorhombic structure with Imma (x = 0.1) and Pnma (0.,0.3 and 0.4) space groups. Transport studies reveal that Mott small polaron hopping type conduction occurs in the insulating regime of the samples. The drop in the zero field cooled dc magnetization, a large thermal irreversibility of the field cooled and zero field cooled data and the presence of two resonance fields below the temperature T* strongly suggest the coexistence of phases in NCSMO. The occurrence of coexisting phases may be strongly influenced by the random distribution of A-site cations such as Sr and Ca, which in turn leads to delocalization of eg electrons and real space ordering of Mn3+ and Mn4+ ions.