Topic
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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TL;DR: In this article, the large magnetoresistive response of slightly nonstoichiometric Ag(2±δ)Te for a wide range of hole (p⩽8×10^(17)
Abstract: We compare the large magnetoresistive response of slightly nonstoichiometric Ag_(2±δ)Te for a wide range of hole (p⩽8×10^(17) cm^(−3)) and electron (n⩽4×10^(18) cm^(−3))carrier densities. In the p-type material alone, a characteristic peak in the resistivity ρ(T,H) is dramatically enhanced and moves to higher temperature with increasing magnetic field, resulting in a high field (H∼5 T) magnetoresistance that is sizeable even at room temperature. By contrast, n-type specimens are geared for low-field (H<0.1 T) applications because of a striking linear field dependence of the magnetoresistance that appears to be restricted to the Ag-rich materials.
49 citations
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TL;DR: In this article, the magnetic and transport response on polycrystalline La 5 / 8 - y Pr x Ca 3 / 8 MnO 3 (y = 0.30, average grain size 2 microns) compound was measured.
Abstract: We have measured magnetic and transport response on the polycrystalline La 5 / 8 - y Pr x Ca 3 / 8 MnO 3 (y = 0.30, average grain size 2 microns) compound In the temperature range where ferromagnetic metallic and insulating regions coexist, we observed a persistent memory of low magnetic fields ( < I T) that is determined by the actual amount of the ferromagnetic phase. The possibility to manipulate this fraction with relatively small external perturbations is related to the phase-separated nature of these manganese-oxide-based compounds The colossal magnetoresistance figures obtained (about 80%) are determined by the fraction enlargement mechanism. Self-shielding of the memory to external fields is found under certain described circumstances. We show that this nonvolatile memory has multilevel capability associated with different applied low magnetic-field values.
49 citations
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TL;DR: In this paper, the surface phase transition of a manganese perovskite was observed at 240 K compared to 370 K for the bulk and is fundamentally different from the surface transition in the bulk.
Abstract: We have observed a distinct surface phase transition for an important class of giant magnetoresistance materials [La1−xSrxMnO3(x=0.35)]. The surface phase transition occurs at 240 K compared to 370 K for the bulk and is fundamentally different. In the bulk, a ferromagnetic metal to paramagnetic bad-metal transition occurs, while the lower-temperature surface transition is from an insulator to a semimetal. The surface of this manganese perovskite is electronically and compositionally quite different from the bulk with important implications for the behavior of artificially grown layered transition-metal oxides and for the use of surface sensitive techniques to probe the bulk.
48 citations
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TL;DR: In this paper, a single-phase La 0.7 Sr 0.3 MnO 3 nanoparticles were prepared by a simple chemical coprecipitation route and their structural, magnetoresistance, and magnetic properties were investigated.
48 citations
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TL;DR: In this article, the structural, magnetic and magneto-transport properties of Pr0.6Sr0.4MnO3, Pr 0.3Sr 0.1MnNO3 and Pr0 0.5Sr 1.1Sr O3 perovskite manganite oxides have been investigated.
48 citations