Journal ArticleDOI
Colossal magnetoresistance of ferromagnetic manganites: Structural tuning and mechanisms.
Josep Fontcuberta,Benjamín Martínez,A. Seffar,S. Piñol,José Luis García-Muñoz,Xavier Obradors +5 more
Reads0
Chats0
TLDR
The amplitude $\ensuremath{\rho}(T,H)$ and temperature ${T}_{M}$ and CMR are found to be controlled by the radius of the lanthanide $({L}^{3+})$ which modifies the bending of the Mn-O-Mn bond.Abstract:
The amplitude $\ensuremath{\Delta}\ensuremath{\rho}(T,H)/\ensuremath{\rho}$ and temperature ${T}_{M}$, where the colossal magnetoresistance (CMR) response of ${L}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ manganites are maximum, are found to be controlled by the radius of the lanthanide $({L}^{3+})$ which modifies the bending of the Mn-O-Mn bond. Increasing the bond distortion lowers ${T}_{M}$ and enhances $\ensuremath{\Delta}\ensuremath{\rho}(T,H)/\ensuremath{\rho}$. Enhanced CMR arises from (1) a shift to lower temperatures of ${T}_{M}$, (2) a reduced mobility of the doping holes, and (3) an increase of the coupling between itinerant and localized electrons. The resistivity $\ensuremath{\rho}\left(H\right)$ follows an $\ensuremath{\approx}{\mathrm{BM}}^{2}\left(H\right)$ law and the parameter $B$ is also tuned by the Mn-O-Mn bond angle. The narrowing of the electronic bandwidth is the fundamental parameter controlling the observed CMR.read more
Citations
More filters
Journal ArticleDOI
An overview of the magnetoresistance phenomenon in molecular systems
TL;DR: The magnetoresistance effect in the molecular systems including small organic molecules, carbon nanotubes, graphene, conductive polymers and their nanocomposites is critically reviewed.
Journal ArticleDOI
Atomically dispersed nonmagnetic electron traps improve oxygen reduction activity of perovskite oxides
Zechao Zhuang,Yong Li,Yihang Li,Jiazhao Huang,Bin Wei,Rong Sun,Yujing Ren,Jie Ding,Jiexin Zhu,Zhiquan Lang,Lyudmila V. Moskaleva,Chuanxin He,Yu Wang,Zhongchang Wang,Dingsheng Wang,Yadong Li +15 more
TL;DR: In this article, a nonmagnetic hexavalent molybdenum (Mo6+) atomically dispersed within oxide lattice steers the intrinsic activity of catalytically active sites by entrapping extrinsic electrons at their 3D orbitals, without the occurrence of lattice symmetry breaking and magnetic perturbation.
Journal ArticleDOI
Microstructure of epitaxial La0.7Ca0.3MnO3 thin films grown on LaAlO3 and SrTiO3
TL;DR: The lattice mismatch between LCMO and STO is relaxed into regions of good coherent fit separated by such secondary phases, possibly resulting from interfacial reaction as discussed by the authors, leading to the formation of two different c...
Journal ArticleDOI
Effects of the Oxygen Nonstoichiometry on the Physical Properties of La0.7Sr0.3MnO3−δ□δ Manganites (0≤δ≤0.15)
TL;DR: In this article, the oxygen deficiency effects on the structural, magnetic, and electrical properties in La0.7Sr0.3MnO3−δ□δ were presented.
Journal ArticleDOI
Hybrid Monte Carlo algorithm for the double exchange model
TL;DR: In this paper, the hybrid Monte Carlo algorithm is adapted to the simulation of a system of classical degrees of freedom coupled to non self-interacting lattices fermions, in d+1 Euclidean space-time.