Local probe studies in the weakly Jahn–Teller distorted LaMnO_3.08 manganite

Abstract

The LaMnO3.08 manganite system was studied as a function of temperature ranging from 10 up to 292 K using the perturbed angular correlation local probe technique at ISOLDE‐CERN facility. The electrical field gradient (EFG) measurements performed across the different temperatures revealed a single EFG distribution, corresponding to a unique probe local environment. In contrast with the small‐polaron picture, no fully Jahn–Teller distorted Mn3+O6 octahedra was observed in this insulator sample. A local single‐phase scenario with uniform Mn charge distribution is proposed.

Exploiting Radioactive Isotopes: from Pollutant Tracking to Solid State Studies Using a Combined Ab Initio and PAC Approach

“…The decrease of η occurs along both the O' and O phases, even though a nearly constant V zz is displayed. This rules out the presence of a fully JT distorted MnO 6 octahedra for the manganites with Δ ≠ 0 , …”

“…In the following manuscript we will make a review of the use of radioactive isotopes as local probes for solid state physics, and nanotechnology studies, with a particular emphasis on hyperfine interactions, where CICECO team has promoted and participated within the international collaboration at ISOLDE (Isotope mass Separator On‐Line facility) in CERN, a laboratory dedicated to the production of radioactive isotopes…”

Large Magnetoresistance and Electrostatic Control of Magnetism in Ordered Mesoporous La1–xCaxMnO3 Thin Films

“…Perovskite-type mixed-valence manganese oxides of the form A 1– x B x MnO 3 (with A = rare earth, B = alkaline earth), such as La 1– x Ca x MnO 3 (LCMO) and La 1– x Sr x MnO 3 (LSMO), are highly interesting from the viewpoint of material science and have been studied for more than 6 decades. − This is due, in part, to the fact that they exhibit interesting magnetotransport properties and have a rich phase diagram that includes, among others, ferromagnetic metallic and insulating phases. − In general, these multimetallic oxides can be considered as solid solutions between A 3+ Mn 3+ O 3 and B 2+ Mn 4+ O 3 , that is, A-site doping leads to mixed-valence states of the manganese ions in the lattice. Over the years, several studies have demonstrated that the magnetic behavior is governed by the ratio of Mn 4+ to Mn 3+ (the Mn 3+ –O 2– –Mn 4+ coupling via double exchange is ferromagnetic in nature), and there is a strong correlation between the magnetic properties and the charge carrier transport through the material …”