Results 171 to 180 of about 8,054 (205)

The overdoped colossal magnetoresistive manganites

Journal of Physics: Condensed Matter, 2007
The rich physics in the overdoped regime in colossal magnetoresistive manganites is discussed in detail. Apart from having a large magnetoresistance like its underdoped counterpart, the overdoped regime offers a rich variety of phenomena including magnetic, charge and orbital order at low temperatures.
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Lattice Effects in the Colossal-Magnetoresistance Manganites

Physical Review Letters, 1996
We study the combined influence of spin double exchange and Jahn-Teller lattice coupling to holes in the ${\mathrm{La}}_{1\ensuremath{-}x}{A}_{x}{\mathrm{MnO}}_{3}$ perovskites ( $A\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}\mathrm{C}\mathrm{a},\phantom{\rule{0ex}{0ex}}\mathrm{S}\mathrm{r},\phantom{\rule{0ex}{0ex}}\mathrm{B}\mathrm{a}$).
, Röder, , Zang, , Bishop
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Novel colossal magnetoresistance in NaCr2O4

Journal of the Korean Physical Society, 2013
NaCr2O4 was recently discovered using a high-pressure synthesis to occur in a calcium-ferrite-type structure, where one-dimensional electronic correlations and geometrical frustrations can coexist. It shows unconventional colossal magnetoresistance (CMR) at temperatures below antiferromagnetic ordering temperature of T
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Colossal magnetoresistance properties of Nd-doped Bi0.5Sr0.5MnO3

Journal of Applied Physics, 2008
We have studied structure, transport, and magnetic properties of NdxBi0.5−xSr0.5MnO3 (NBSMO) (x=0.2 and 0.4) through x-ray diffraction, magnetoresistance, and magnetization measurements. The Rietveld analysis of the x-ray diffraction data shows that the NBSMO crystallizes in an orthorhombic perovskite structure with Pbnm space group for x=0.2 and Imma ...
Savitha Pillai, S., Santhosh, P. N., Markandeyulu, G., John Thomas, P., Tuna, F.   +4 more
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Colossal magnetoresistance in manganese oxide perovskites

Journal of Magnetism and Magnetic Materials, 1998
Abstract The large magnetoresistance observed in the manganese-oxide-based perovskites is explained on the basis of a strong electron-phonon and ferromagnetic interactions which provide the mechanism for the existence of dynamic electronic phase segregation in the form of magnetic polarons.
M.R. Ibarra, J.M. De Teresa
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Colossal magnetoresistance in La-Ca-Mn-O

Metals and Materials, 1997
ABSTRACTVery large increase in electrical conductivity by several orders of magnitude is obtained when an external magnetic field is applied to the colossal magnetoresistance (CMR) materials such as La-Ca-Mn-O. The magnetoresistance is strongly temperature-dependent, and exhibits a sharp peak below room temperature, which can be shifted by adjusting ...
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Ferromagnetism and Colossal Magnetoresistance from Phase Competition

Physical Review Letters, 2000
We report a multicomponent theory for the coexistence of charge ordering (CO), and antiferromagnetic (AFM) and ferromagnetic (FM) spin ordering. This kind of state is invoked for manganites by Moreo et al., Science 283, 2034 (1999) and observed in recent experiments. We show that doping an AFM or CO state always generates a FM component.
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Optical Properties of Colossal Magnetoresistance Manganites

2006
In this article, we reviewed theoretical and experimental works on optical properties of colossal magnetoresistance materials. Our detailed studies on (La,Ca)MnO3 at room temperature revealed that there exist two absorption features which can be attributed to a small polaron absorption and an optical transition between the Jahn-Teller split Mn3+ levels.
T. W. Noh, J. H. Jung, K. H. Kim
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Electronic Theory of Colossal Magnetoresistance Materials

1998
We study a model based on the double exchange mechanism and diagonal disorder to calculate magnetization and conductivity for La1−x Sr x MnO3 type crystals as a function of temperature. The model represents each Mn4+ ion by a spin , on which an electron can be added to produce Mn3+.
R. Allub, B. Alascio
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Phase engineering of Cr5Te8 with colossal anomalous Hall effect

Nature Electronics, 2022
Bijun Tang, Xiaowei Wang, Mengjiao Han
exaly