Colossal Magnetoresistance and Charge‐ordering in Rare Earth Manganites

Raveau, B.; Rao, C. N. R.

doi:10.1002/3527600841.ch9

Magnetism: Molecules to Materials I 2001

DOI: 10.1002/3527600841.ch9

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Colossal Magnetoresistance and Charge‐ordering in Rare Earth Manganites

B. Raveau

C. N. R. Rao

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Cited by 2 publications

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Crystal and magnetic structure of Cr- and Ni-substituted (La_0.50Ca_0.50)MnO₃

Martinelli¹,

Ferretti

Castellano³

et al. 2008

J. Phys.: Condens. Matter

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The crystal and magnetic structure of (La 0.50 Ca 0.50 )(Mn 1−x B x )O 3 (x = 0.00, 0.03, 0.08; B = Cr, Ni) has been investigated between 5 and 300 K by means of dc magnetic measurements and neutron powder diffraction followed by Rietveld refinement. In the pristine compound an orthorhombic to monoclinic phase transition is detected on cooling, accompanied by a CE-type antiferromagnetic (AFM) ordering arising. Ni 2+ and Cr 3+ substitutions have similar effects on the structural and magnetic properties of (La 0.50 Ca 0.50 )MnO 3 , despite the fact that these ions are characterized by different external electronic configurations. After substitution, the orthorhombic to monoclinic phase transition is hindered. As a consequence, charge and orbital orderings are suppressed, as is the superexchange; double exchange takes place inducing ferromagnetic (FM) interactions. No evidence for stable magnetic interaction between Cr 3+ or Ni 2+ and the neighbouring Mn ions was detected. Nevertheless, in the Ni-substituted samples a detectable quantity of monoclinic phase forms during cooling, inside which AFM interactions take place. The amount of this secondary monoclinic phase decreases on increasing Ni substitution; the global FM magnetic moment decreases as well, due to a spin-cluster glass-type state arising. As a result a FM state is found to coexist with a spin-cluster glass-type state.

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Crystal and magnetic structure of Cr- and Ni-substituted (La_0.50Ca_0.50)MnO₃

Martinelli¹,

Ferretti

Castellano³

et al. 2008

J. Phys.: Condens. Matter

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show abstract

Structural, microstructural and magnetic properties of (La_1−xCa_x)MnO₃nanoparticles

Martinelli¹,

Ferretti²,

Castellano³

et al. 2013

J. Phys.: Condens. Matter

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The crystal and magnetic structures of 10 and 20 nm sized (La1-xCax)MnO3 (x = 0.37, 0.50, 0.75) have been investigated between 5 and 300 K by means of Rietveld refinement of neutron powder diffraction data, coupled with transmission electron microscope observation and magnetization measurements. TEM observation reveals that nanoparticles are strongly affected by strain fields, probably originating from surface pressure. Irrespective of the composition, charge and orbital orderings are suppressed and Fz and Cy spin orderings coexist at low temperature; Cy and Fz orderings likely occur within the strained regions of the nanoparticles and in the matrix respectively. Moreover Gz and Az orderings are sometimes observed, and are likely to be taking place at the border of the strained regions.

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Colossal Magnetoresistance and Charge‐ordering in Rare Earth Manganites

Cited by 2 publications

References 37 publications

Crystal and magnetic structure of Cr- and Ni-substituted (La_0.50Ca_0.50)MnO₃

Crystal and magnetic structure of Cr- and Ni-substituted (La_0.50Ca_0.50)MnO₃

Structural, microstructural and magnetic properties of (La_1−xCa_x)MnO₃nanoparticles

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Colossal Magnetoresistance and Charge‐ordering in Rare Earth Manganites

Cited by 2 publications

References 37 publications

Crystal and magnetic structure of Cr- and Ni-substituted (La0.50Ca0.50)MnO3

Crystal and magnetic structure of Cr- and Ni-substituted (La0.50Ca0.50)MnO3

Structural, microstructural and magnetic properties of (La1−xCax)MnO3nanoparticles

Contact Info

Product

Resources

About

Crystal and magnetic structure of Cr- and Ni-substituted (La_0.50Ca_0.50)MnO₃

Crystal and magnetic structure of Cr- and Ni-substituted (La_0.50Ca_0.50)MnO₃

Structural, microstructural and magnetic properties of (La_1−xCa_x)MnO₃nanoparticles