Magnetocaloric effect in Pr1 − x Ag x MnO3 manganites

Investigation of the role of Ag in Pr1−xAgxMnO3 manganites

X-Ray diffraction, ac susceptibility and electrical resistivity measurements were performed in order to investigate the effect of Ag substitution for Pr in the polycrystalline Pr1−xAgxMnO3 (0.0≤x≤0.25) manganites. The XRD results show that the samples crystallize in the O’orthorhombic structure with a cooperative Jahn-Teller deformation. We give evidence that the Ag is not substituted at the Pr...

Magnetocaloric Effect in Manganites: Ferromagnetism and Charge- Ordering Effects

A study of the magnetocaloric properties of manganites with ferromagnetic and chargeordering states is presented. Under the application of a magnetic field in the vicinity of the paramagnetic-ferromagnetic and paramagnetic-charge order transitions large changes of the magnetic entropy are found, negative or positive, respectively. The physical mechanisms that contribute to the magnetic entropy ...

Composition dependence of magnetocaloric effect in Sm 1 - x Sr x MnO 3 ( x = 0 . 3 - 0 . 5 )

We investigated magnetic and magnetocaloric properties in Sm1-xSrxMnO3 (x = 0.300.5). We report a magnetic field driven first-order metamagnetic transition in the paramagnetic state in x = 0.4 and 0.5 and a second-order transition in x = 0.3. The highest magnetic entropy (-Sm = 6.2 J/kgK for H = 5 T at T = 125 K) that occurs in x = 0.4 is associated with the metamagnetic transition resulting ...

Hidden magnetic configuration in epitaxial La(1-x) Sr(x) MnO3 films.

We present an unreported magnetic configuration in epitaxial La(1-x) Sr(x) MnO3 (x ∼ 0.3) (LSMO) films grown on strontium titanate (STO). X-ray magnetic circular dichroism indicates that the remanent magnetic state of thick LSMO films is opposite to the direction of the applied magnetic field. Spectroscopic and scattering measurements reveal that the average Mn valence varies from mixed Mn(3+)/...

بررسی خواص مغناطیسی ابررسانای سرامیکی Yba2Cu3O7-x/Ag