Journal ArticleDOI
Electrical transport properties and magnetic cluster glass behavior of Nd0.7Sr0.3MnO3 nanoparticles
B. Roy,Asok Poddar,S. Das +2 more
TLDR
In this article, the transport and magnetic properties of Nd07Sr03MnO3 nanoparticles were investigated by the sol-gel method and the results showed that resistivity increases with the decrease of the particle size due to the enhancement of the grain boundary effect.Abstract:
The transport and magnetic properties have been investigated in Nd07Sr03MnO3 nanoparticles prepared by the sol-gel method The resistivity (ρ) increases with the decrease of the particle size due to the enhancement of the grain boundary effect ρ(T) shows two distinct transitions for all the samples such as metal-insulator transition and transition due to the barrier caused by the grain boundary effect The thermopower (S) is found to be negative and at high temperature S follows the adiabatic small polaron hopping theory In the metallic region the spin wave contribution is found to be dominant in the temperature dependence of the thermopower The magnetoresistance (MR) of the ultrafine particles increases with the decrease of particle size indicating substantial contribution from the grain boundaries Spin polarized intergrain tunneling effect plays an important role in the MR of a smaller size particle, whereas in the case of samples of higher dimension spin fluctuation contributes predominantly Theread more
Citations
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Effect of the calcination temperature on the magnetic and transport properties of rhombohedral LaMnO3+δ compounds
TL;DR: In this article, hombohedral LaMnO(3+delta) powders were successfully synthesized by annealing gel precursors obtained by a polymerized complex method.
Journal ArticleDOI
Magnetotransport properties of ferromagnetic LaMnO3+δ nano-sized crystals
V. Markovich,Grzegorz Jung,I. M. Fita,I. M. Fita,D. Mogilyansky,Xinhua Wu,Xinhua Wu,A. Wisniewski,Roman Puzniak,L. Titelman,L. Vradman,Moti Herskowitz,G. Gorodetsky +12 more
TL;DR: In this article, the transport and magnetic properties of LaMnO3+δ nanoparticles with average size of 18nm have been investigated, and the ensemble of nanoparticles exhibits a paramagnetic to ferromagnetic (FM) transition at TC∼246 K, while the spontaneous magnetization disappears at T≈270 K.
Journal ArticleDOI
Magnetic and electrical transport properties of La0.5A0.5CoO3 nanoparticles (A = Sr, Ca, and Ba)
TL;DR: In this paper, the effect of particle size on the electrical transport and magnetic properties of La 0.5 A 0.3 CoO 3 nanoparticles synthesized by sol-gel technique was investigated.
Journal ArticleDOI
An Investigation on Magnetic Interacting La0.6Sr0.4MnO3 Nanoparticles
TL;DR: In this paper, the structural and magnetic properties of LSMO3 were investigated systematically, and it was shown that there is a strong interaction between magnetic nanoparticles of the LSMO and spin glass states, which indicated the existence of superparamagnetic/spin glass states.
Journal ArticleDOI
Thermoelectric and magnetic properties of nanocrystalline La0.7Sr0.3CoO3
TL;DR: In this article, the effect of grain size on the electrical, thermal, and magnetic properties of La0.7Sr0.3CoO3 samples obtained by solid-state reaction combined with ball milling was investigated.
References
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Journal ArticleDOI
Semiconductor Clusters, Nanocrystals, and Quantum Dots
TL;DR: In this article, the authors focus on the properties of quantum dots and their ability to join the dots into complex assemblies creates many opportunities for scientific discovery, such as the ability of joining the dots to complex assemblies.
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Metal-insulator transitions
TL;DR: A review of the metal-insulator transition can be found in this article, where a pedagogical introduction to the subject is given, as well as a comparison between experimental results and theoretical achievements.
Journal ArticleDOI
Double exchange alone does not explain the resistivity of La1-xSrxMnO3.
TL;DR: It is proposed that in addition to double-exchange physics a strong electron-phonon interaction arising from the Jahn-Teller splitting of the outer Mn $d$ level plays a crucial role.
Journal ArticleDOI
Studies of polaron motion: Part II. The “small” polaron
TL;DR: In this article, the authors considered the case in which the electronic-overlap term of the total Hamiltonian is a small perturbation, and showed that the probability of off-diagonal transitions goes up exponentially with increasing temperature.
Journal ArticleDOI
The physics of manganites: Structure and transport
M. B. Salamon,Marcelo Jaime +1 more
TL;DR: The fundamental physical properties of doped oxides and their underlying physics were known more than 40 years ago as mentioned in this paper, and the concept of double exchange in particular, and points out the missing elements that have led to a massive resurgence of interest in these and related materials.