Effect of Cr substitution on magnetic and magnetic entropy change of La0.65Eu0.05Sr0.3Mn1−xCrxO3 (0.05≤x≤0.15) rhombohedral nanocrystalline near room temperature

Copper-doped lanthanum manganite La0.65Ce0.05Sr0.3Mn1−xCuxO3 influence on structural, magnetic and magnetocaloric effects

“…In manganites, it is possible to dope at both R-site and Mnsite, much research has been done on the substitution at the Rsite with transition elements [10][11][12] and/or rare-earths Eu, 13 Ce, 14 Pr, 15 which can modify the Mn 3+ -O 2À -Mn 4+ network and in turn will intensively affect the intrinsic physical properties, such as ferromagnetism and (MCE). The substitution at the Mn site in perovskite oxides, with other transition metal ions, [16][17][18][19][20] is more important because it not only modies the Mn 3+ -O 2À -Mn 4+ network but also brings about many new exchange interactions between the Mn ion and the doped transition metal ions.…”

Effect of strontium deficiency on the structural, magnetic and magnetocaloric properties of La0.65Eu0.05Sr0.3−xMnO3 (0 ≤ x ≤ 0.15) perovskites

“…Hence, the presence of mixed valence states of Mn ions in the doped manganites gives rise to the competing double exchange (DE) and super-exchange (SE) interactions. [17][18][19][20] On the other hand, the ceramic preparation route, such as the conventional solid-state reaction method, the sol-gel method and combustion thermal spray techniques were used to prepare rare-earth perovskite materials. [10][11][12][13] The manganites have additional advantages such as low cost, good chemical stability, easy preparation and more importantly the ability to tailor their magnetic transition temperatures close to room temperature by R-site or Mn-site substitution.…”

“…One recent example of this chemical substitution for tuning T C in manganites is in the La 0.7 Sr 0.3 MnO 3 (LSMO) system, which is a colossal magnetoresistive ferromagnetic manganite with T c $ 370 K, and either by substitution of the La ion by the rare-earths Nd, 14 Pr, 15 Eu, 16 or by substitution of Mn ions by other transition metal ions such as Cr, Fe, Zn, Ti, etc. [17][18][19][20] On the other hand, the ceramic preparation route, such as the conventional solid-state reaction method, the solgel method and combustion thermal spray techniques were used to prepare rare-earth perovskite materials. The method of synthesis plays an important role on the quality and the magnetocaloric properties of materials.…”

Anomalous evolution of the magnetocaloric effect in dilute triangular Ising antiferromagnets Tb1−xYx(HCO2Falsaperna1, Bulled2, Stenning3 et al. 2022Phys. Rev. Materials0000View full textAdd to dashboardCite

“…This trend is then reversed at higher concentrations, with Tb0.60Y0.40(HCO2)3 having the highest -ΔSm max amongst the Y doped samples with respect to the amount of Tb 3+ present for all field changes considered. Exceptionally Tb0.60Y0.40(HCO2)3 has a higher normalised -ΔSm max than that of the parent compound Tb(HCO2)3 for all the applied field changes (see insets in When compared to other magnetically-dilute MCE materials, such as the Ga-doped La0.7(Ba, Sr)0.3Mn1-xGaxO3 (x = 0, 0.1, 0.2), 30 the Cr-doped La0.65Eu0.05Sr0.3Mn1-xCrxO3 (x = 0.05, 0.1, and 0.15), 31 and the Sn-substituted RCo2 (R = Gd, Tb, Dy) alloys, the Tb1-xYx(HCO2)3 series follows similar trends with respect to its initial decrease in -ΔSm max with Y 3+ doping -i.e. lower transition temperatures and lower values of -ΔSm max when higher concentrations of non-magnetic impurities are present.…”