Europhys. Lett.
Volume 70, Number 3, May 2005
Page(s) 376 - 382
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 08 April 2005
Europhys. Lett., 70 (3), pp. 376-382 (2005)
DOI: 10.1209/epl/i2004-10497-5

Ultra-sharp metamagnetic transitions in the half-doped manganite compound $\chem{Eu_{0.5}Sr_{0.5}MnO_3}$

D. 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 $\chem{Eu_{0.5}Sr_{0.5}MnO_3}$ manganite compound. These studies reveal successive sharp step-like metamagnetic transitions at low temperatures. The steps are sharp at $T\leq3$$\un{K}$ but smeared above 3$\un{K}$, signifying the transformation from a homogenous to an inhomogenous phase-separated state at 3$\un{K}$. Earlier such successive sharp steps have been observed mostly in $\chem{Pr}$-based manganites (in which $\chem{Pr}$ is magnetic). The observation of the similar steps in the present $\chem{Eu}$-based system (in which $\chem{Eu}$ 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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