Journal of New Technology and Materials
Volume 8, Numéro 1, Pages 42-47

Structure And Magnetic Properties Of Monovalent Doping Charge Ordering Perovskite

Authors : Trabelsi Hamdi .


The present paper reports detailed structural, magnetic and magnetocaloric characterizations of the charge ordered Nd0.5Ca0.4M0.1MnO3 (M=Na, K : NCNMO and NCKMO) polycrystalline samples. Our compounds were synthesized using the solid state reaction at high temperature. Both samples are single phase and crystallize in the orthorhombic structure with Pnma space group. NCNMO (⟨r_A ⟩ = 1.1775 Å) undergoes a charge disordering transition (CO) associated to the paramagnetic (PM)-antiferromagnetic (AFM) phase transition at T < 250 K. The long range AFM ordering seems to from at 35 K, rather than 150 K as previously reported. In the intermediate temperature range, charge ordering occurs while orbital ordering sets in progressively, with no magnetic order. For NCKMO sample (⟨r_A ⟩ = 1.2085 Å), K doping induces the melting of the CO state and the presence of the short-range AFM phase, which is metastable and transforms into the stable ferromagnetic (FM) state. Magnetic characterization shows the signature of AFM-FM ordering and spin-glass coexisting at low temperature. The temperature dependence of magnetic entropy change at high magnetic field values presents some anomalies attributed to the metamagnetic transition, which is of first order.


Manganites; Structure; Charge ordering; Magnetocaloric effect.

Optoelectronic And Magnetic Properties Of The Ortho-perovskite Gdruo3 Using Dft+u With Spin-orbit Coupling: Predictive Study

Labdelli Abbes .  Meskine Said .  Boukortt Abdelkader .  Khenata Rabah . 
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Effect Of Al Doping On The Properties Of Electrodeposited Zno Nanostructures

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A Comparative Study Of The Structural, Magnetic And Magnetocaloric Properties In Pr0.6la0.1m0.3mno3 Manganites (m = Ca, Ba And Mg)

Zouari S. .  Hlil E. K. .  Kahn M. L. .  Ellouze M. .  Elhalouani F. . 
pages 19-23.

Magnetic Properties Of The Spinel Compound Cu1.30cr1.30zr0.70se4.

Belakroum K .  Ouili Z .  Leblanc A . 
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