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Colossal magnetoresistance

About: Colossal magnetoresistance is a research topic. Over the lifetime, 3658 publications have been published within this topic receiving 130104 citations.


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Journal ArticleDOI
TL;DR: The effects of structural, electrical and magnetic properties with the isovalent chemical substitution of Ca2+ into the Sr2+ sites in La12(Sr18−xCax)Mn2O7 (x=0-08) are investigated in this paper.
Abstract: The effects of structural, electrical and magnetic properties with the isovalent chemical substitution of Ca2+ into the Sr2+ sites in La12(Sr18−xCax)Mn2O7 (x=0–08) are investigated The highest magnetoresistance ratio [ρ(0)/ρ(H)] of 208% (H=15 T) at a temperature of 102 K was observed for the x=04 sample The Curie temperatures decreased from 135 to 102 K for x=0–04, respectively Moreover, the Weiss constants θ were varied from the positive to negative value with increasing Ca concentration The antiferromagnetic behavior with Neel temperature around 30 K was found in the x=08 sample The magnetization measurements show that the hysteresis phenomenon appeared at the temperatures below the Curie or Neel temperatures

27 citations

Journal ArticleDOI
TL;DR: More than 60 Ruddlesden-popper-type transition metal oxides have been synthesized at high pressures and temperatures during the last decade as mentioned in this paper, including perovskites with complex cation orderings on A and B sites.
Abstract: Perovskite and related Ruddlesden-Popper type transition metal oxides synthesised at high pressures and temperatures during the last decade are reviewed. More than 60 such new materials have been reported since 1995. Important developments have included perovskites with complex cation orderings on A and B sites, multiferroic bismuth-based perovskites, and new manganites showing colossal magnetoresistance (CMR) and charge ordering properties.

27 citations

Journal ArticleDOI
TL;DR: In this paper, the magnetic and transport properties of perovskites La0.67 Sr0.33 (Mn1-x Nix )O3 (x ≤ 0.2) are investigated.
Abstract: A systematic investigation of the magnetic and transport properties of perovskites La0.67 Sr0.33 (Mn1-x Nix )O3 (x ≤ 0.2) is reported. The replacement of the Mn ion by a Ni ion results in a reduction of ferromagnetism and metallic conduction. For the sample with x = 0.1, in addition to a metal-insulator (M-I) transition at 240 K, there is a weak insulating behaviour at low temperatures. As the magnetization drop below the Curie temperature (TC ) in the thermomagnetic curve appears for the dosage of x = 0.15, the insulating behaviour at low temperatures becomes pronounced. For the sample with x = 0.2, a cluster glass-like state with no M-I transition near TC 194 K is shown. The ferromagnetic superexchange interaction between the Mn3+(4+) ion and the Ni2+ ion is found to account for the formation of the cluster glass-like state rather than a spin glass state. All samples have a colossal magnetoresistance (CMR). In particular, with the suppression of the ferromagnetism, the MR effect shifts towards low temperatures and becomes considerably enhanced. Besides the depletion of hopping electrons and the destroyed metallic paths due to the foreign Ni ion terminating the double exchange interaction in the Mn-O network, the randomly frozen spin cluster at low temperatures has been revealed as another crucial factor for localizing charge carriers.

27 citations

Journal ArticleDOI
TL;DR: In this article, the temperature dependence of the ac resistance and the inductive reactance (X) of the complex impedance (Z = R+jX) under different dc bias magnetic fields (Hdc = 0-1 kOe) were studied for different frequencies f = 0.1 to 5 MHz of alternating current.
Abstract: We report dynamical magnetotransport in a ferromagnetic metallic oxide, La0.7Sr0.3MnO3 using the ac impedance technique. The temperature dependence of the ac resistance(R) and the inductive reactance (X) of the complex impedance (Z = R+jX) under different dc bias magnetic fields (Hdc = 0-1 kOe) were studied for different frequencies f = 0.1 to 5 MHz of alternating current. The zero field R, which decreases smoothly around the Curie temperature TC for f = 100 kHz, transforms into a peak for f = 0.5-5 MHz. The peak decreases in amplitude, broadens and shifts downward in temperature as the bias field increases. A huge ac magnetoresistance (= 45 % at f = 2 MHz) in a field of Hdc = 1 kOe is found and we attribute it to the magnetic field- induced enhancement in the skin depth and concomitant suppression of magnetic fluctuations near TC. Our study suggests that radio frequency magnetotransport provides an alternative strategy to enhance the magnetoresistance and probe the spin-charge coupling in manganites.

27 citations

Journal ArticleDOI
TL;DR: It is shown that spin ordering in manganites can be controlled by depositing isolated ferromagnetic nanodots at the surface, indicating that electronic phase separation can becontrolled by the presence of magnetic nanodot density.
Abstract: In strongly correlated electronic systems, the global transport behavior depends sensitively on spin ordering. We show that spin ordering in manganites can be controlled by depositing isolated ferromagnetic nanodots at the surface. The exchange field at the interface is tunable with nanodot density and makes it possible to overcome dimensionality and strain effects in frustrated systems to greatly increasing the metal-insulator transition and magnetoresistance. These findings indicate that electronic phase separation can be controlled by the presence of magnetic nanodots.

27 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202330
202252
202139
202038
201937
201837