Ultra-sharp metamagnetic transitions in the half-doped manganite compoundD. S. Rana1, 2, R. Nirmala2 and S. K. Malik2
1 Department of Physics, Saurashtra University - Rajkot 360 005, India
2 Tata Institute of Fundamental Research - Colaba, Mumbai 400 005, India
received 10 November 2004; accepted in final form 15 March 2005
published online 8 April 2005
Magnetization, electrical-resistance and specific-heat measurements have been performed on the ABO3-type half-doped manganite compound. These studies reveal successive sharp step-like metamagnetic transitions at low temperatures. The steps are sharp at but smeared above 3, signifying the transformation from a homogenous to an inhomogenous phase-separated state at 3. Earlier such successive sharp steps have been observed mostly in -based manganites (in which is magnetic). The observation of the similar steps in the present -based system (in which is non-magnetic), along with the irreversibility in the magnetization isotherms, suggests that rare-earth magnetism has no role in the occurrence of this fascinating property.
75.47.-m - Magnetotransport phenomena; materials for magnetotransport.
75.47.Gk - Colossal magnetoresistance.
75.47.Lx - Manganites.
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