Topic
Colossal magnetoresistance
About: Colossal magnetoresistance is a research topic. Over the lifetime, 3658 publications have been published within this topic receiving 130104 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this paper, the resistivity and magnetoresistance of a single crystal were measured in the temperature range from 1.3 to 300 K under the magnetic field up to 85 kOe.
106 citations
TL;DR: The stability of charge-orbital ordering in a colossal magnetoresistance (CMR) manganite can be varied to a large extent by doping of Cr impurities on the Mn site.
Abstract: The stability of charge-orbital ordering in a colossal magnetoresistance (CMR) manganite can be varied to a large extent by doping of Cr impurities on the Mn site. Most of the generic features seen in the CMR manganites, such as the submicrometric phase separation into metallic and insulating states, a resistivity-enhanced paramagnetic state, and related CMR effect, can be generated successively with Cr doping in ${\mathrm{Nd}}_{1/2}{\mathrm{Ca}}_{1/2}{\mathrm{MnO}}_{3}$ crystal. Systematic studies of the Cr-doped crystals by measurements of magnetotransport and x-ray diffraction have shown that the incommensurate charge-orbital-ordered state turns into the dynamic and short-range charge-orbital correlation that is the origin of the high-resistive state exhibiting CMR.
106 citations
TL;DR: In this paper, a thin La1−xCaxMnOδ with tetragonal symmetry was fabricated and the measured magnetoresistance is anisotropic: initially positive for applied magnetic field perpendicular to the film plane and negative for field applied parallel to the plane.
Abstract: We have fabricated thin films of La1−xCaxMnOδ with tetragonal symmetry. For low temperatures and magnetic fields the measured magnetoresistance is anisotropic: initially positive for applied magnetic field perpendicular to the film plane and negative for field applied parallel to the film plane. At high temperatures the magnetoresistance is negative for all fields and field orientations. We also observe an in‐plane magnetoresistance anisotropy with an angular dependence corresponding to that observed in transition metal ferromagnets. We suggest an interpretation requiring a substantial spin‐orbit interaction in the material.
105 citations
TL;DR: Scanning-electron-nanodiffraction images of nanoclusters as they form and evolve with temperature in La(1-x)Ca(x)MnO(3), x = 0.45 are provided.
Abstract: A nanoscale phase is known to coincide with colossal magnetoresistance (CMR) in manganites, but its volume fraction is believed to be too small to affect CMR. Here we provide scanning-electron-nanodiffraction images of nanoclusters as they form and evolve with temperature in ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$, $x=0.45$. They are not doping inhomogeneities, and their structure is that of the bulk compound at $x=0.60$, which at low temperatures is insulating. Their volume fraction peaks at the CMR critical temperature and is estimated to be 22% at finite magnetic fields. In view of the known dependence of the nanoscale phase on magnetic fields, such a volume fraction can make a significant contribution to the CMR peak.
105 citations
TL;DR: In this paper, the authors discuss the transport properties of transition ferromagnetic alloys and their alloys, focusing on the internal magnetoresistance of Fe, Co, and Ni.
Abstract: Publisher Summary This chapter discusses the transport properties of ferromagnets. The focus is on transport properties of the transition ferromagnets Fe, Co, and Ni and their alloys. In pure ferromagnetic metals, the “internal magnetoresistance” enhances the resistivity that is no longer proportional to the concentration of impurities. This effect is particularly important for Fe and a high transverse magnetoresistance. For demagnetized Fe polycrystals, it was pointed out that the apparent residual resistivity ratio would never increase beyond about 300, however pure the sample. It is now standard practice to measure the low temperature resistivity of Fe samples in a saturating longitudinal magnetic field to eliminate transverse magnetoresistance. This can reduce the apparent resistivity by a factor of five or more. In principle, a correction should still be made for the longitudinal magnetoresistance. In Ni samples, the enhancement of the residual resistivity by the internal magnetoresistance is less important than in Fe but still significant. For non-magnetic alloys, the low temperature magnetoresistance behavior generally follows Kohler's rule. Schwerer and Silcox showed by a careful study of dilute Ni alloy samples that for a given series of alloys the ordinary magnetoresistance follows a Kohler's rule, but that the Kohler function varied considerably with the type of scatterer.
105 citations