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 Ho-doping on structural, electrical and magnetic properties of La0.7Sr0.3MnO3 ceramics prepared by Plasma-Activated Sintering
TL;DR: In this article, the conduction mechanism of LHSMO ceramics was found to be in accord with the electron-magnon scattering process in the low temperature region and the small polaron hopping model in the high-temperature region.
Journal ArticleDOI
Critical behavior and the absence of glass state in ferromagnetic La0.7Ca0.3CoO3 nanowires
Yang Wang,Hong Jin Fan +1 more
TL;DR: In this article, the magnetic and thermodynamic properties of uniform La 0.7 Ca 0.3 CoO 3 nanowires were compared with their bulk counterpart, and critical behavior analysis showed that they fall into a three-dimensional Heisenberg ferromagnet class.
Journal ArticleDOI
Structural, electrical and magnetic properties of polycrystalline La0.67(Ca1−x Sr x )0.33MnO3 manganites
Sen Choung Chang,Shaari Abdul Halim,Manizheh Navasery,Zainal Abidin Talib,Kean Pah Lim,Soo Kien Chen,Mohd Mustafa Awang Kechik +6 more
TL;DR: In this article, X-ray diffraction (XRD) patterns reveal that polycrystalline La0.67Ca0.33MnO3 exhibits orthorhombic structure with space group Pnma.
Journal ArticleDOI
Observation of Cluster Glass and Griffiths‐Like Phase in Fe3O4 Nanostructures
Ramany Revathy,Manoj Raama Varma,Manoj Raama Varma,Kuzhichalil Peethambharan Surendran,Kuzhichalil Peethambharan Surendran +4 more
Journal ArticleDOI
Low temperature magnetoresistive effects and coulomb blockade in La0.7Ca0.3MnO3 nanoparticles synthesis by auto-Ignition method
TL;DR: In this article, electrical transport properties of the La0.7Ca0.3MnO3nanoparticles have been investigated in the temperature range 300 to 9 K as a function of magnetic field.
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.
Journal ArticleDOI
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.
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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.