Dynamic Jahn-Teller Effect and Colossal Magnetoresistance in La 1-x Sr x MnO 3
TLDR
A model which incorporates the physics of dynamic Jahn-Teller and double-exchange effects is presented and solved via a dynamical mean field approximation to reproduce the behavior of the resistivity and magnetic transition temperature observed in Sr_x MnO_3.Abstract:
A model for the doped rare-earth manganites such as ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{MnO}}_{3}$ incorporating the physics of dynamic Jahn-Teller and double-exchange effects is presented and solved via a dynamical mean field approximation. The interplay of these two effects as the electron phonon coupling is varied reproduces the observed behavior of the resistivity and magnetic transition temperature.read more
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Charge ordering, magnetic, electrical transport and thermal transport properties of Nd0.75Na0.25MnO3 manganite
TL;DR: In this paper, the electron diffraction patterns of Nd 0.75 Na 0.25 MnO 3 were recorded at various temperatures, and it was found that the Mn 3+ and Mn 4+ ions formed zigzag chains in the a-c plane of the orthorhombic lattice (space group Pnma).
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Vacancy effect in both calcium and barium on the physical properties of La0.6Ca0.2Ba0.2MnO3 polycrystalline manganite
TL;DR: In this paper, the effect of both calcium and barium (5%) on the structural, magnetic and magnetocaloric properties of La0.6Ca0.2MnO3 (LCBMO) polycrystalline manganite was reported.
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Structural and electrical transport properties of (La 0.7- x Y x )Ca 0.3 MnO 3 manganites
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Enhanced Structural and Magnetic Coupling in a Mesocrystal-Assisted Nanocomposite.
Yuanmin Zhu,Qian Zhan,Jan Chi Yang,Yugandhar Bitla,Pingping Liu,Chen I. Li,Heng Jui Liu,V. Suresh Kumar,Elke Arenholz,Qing He,Ying-Hao Chu,Ying-Hao Chu +11 more
TL;DR: Combined magnetic and X-ray absorption spectroscopic measurements show significant enhancement in the magnetic properties at room temperature due to the structural evolution of magnetic NiFe2O4 and the consequent magnetic coupling at the heterointerfaces mediating via well connected octahedrons of Mn-O6 in La0.67Ca0.33MnO3.
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Ultrasonic studies on colossal magnetoresistive La1−xCaxMnO3 (x=0.25, 0.33 and 0.45)
TL;DR: In this article, the lattice hardening was observed below T c (paramagnetic-ferromagnetic transition) in x = 0.25 and 0.33 samples, indicating the prominent role of lattice vibrations in the physical properties of this material.