Magnetization and resistivity steps in the phase separated PrCaMn NiO manganites |
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| Authors: | S Hébert A Maignan V Hardy C Martin M Hervieu B Raveau R Mahendiran P Schiffer |
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| Institution: | (1) Laboratoire CRISMAT, ISMRA, 6 Boulevard du Maréchal Juin 14050 Caen Cedex, France, FR;(2) Department of Physics and Materials Research Institute, 104 Davey Laboratory, Pennsylvania State University, University Park, PA-16802, USA, US |
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| Abstract: | The low temperature magnetic and transport properties of the Pr0.5Ca0.5Mn1-xNixO3 manganites ( 0≤
x
≤0.1) have been investigated. The presence of Ni hinders the charge and orbital ordering observed in Pr0.5Ca0.5MnO3 and favors the creation of ferromagnetic regions, leading to phase separation. The ferromagnetic fractions induced by the
Ni substitution have been estimated from magnetization measurements, they are large and reach 40% for 4% of Ni. Steps are
observed in the M
(
H
) and ρ(
H
) curves of all the samples at T
< 5 K. They are similar to the steps observed in Pr0.5Ca0.5Mn1-xMxO3, where M is a non magnetic cation (Mg2+, Ga3+,...), and for which the ferromagnetic fractions are very small (less than 2%), however, their appearance is restricted to
lower temperatures (T
< 5 K) with Ni dopant than with non magnetic cations. This study shows that steps can be observed in a wide range of phase-separated
systems, even when the ferromagnetic fraction is very large.
Received 5 April 2002 / Received in final form 8 July 2002 Published online 14 October 2002
RID="a"
ID="a"e-mail: antoine.maignan@ismra.fr |
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| Keywords: | PACS 71 30 +h Metal-insulator transitions and other electronic transitions – 75 25 +z Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies synchrotron-source X-ray scattering etc ) – 61 14 -x Electron diffraction and scattering |
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