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 structural, magnetic, and magnetocaloric properties of the manganite La0.7Ca0.3MnO3 have been studied and the magnetic entropy change observed in this work is estimated to be 5.27 J/kg
Abstract: The structural, magnetic, and magnetocaloric properties of the manganite La0.7Ca0.3MnO3 have been studied. Change in the giant magnetic entropy was observed without any noticeable magnetic hysteresis but with small thermal hysteresis losses. We observed a first order magnetic phase transition around 251 K. The magnetic entropy change observed in this work is estimated to be 5.27 J/kg K for field changes from 0 to 1.5 T based on magnetization measurements. This value is about twice as large as those for other perovskite manganites and is even larger than for Gd-based magnetic materials at low fields. In addition, the entropy change was estimated by using the heat capacity method, which can be well explained by the Maxwell relation.
34 citations
TL;DR: The electrical transport and magnetoresistance properties of the polycrystalline La0.67Ca0.33MnO3 film produced on a Pyrex substrate were investigated for the first time.
Abstract: The electrical transport and magnetoresistance properties of the polycrystalline La0.67Ca0.33MnO3 film produced on a Pyrex substrate were investigated for the first time. X-ray powder diffraction indicated that the film sample has a perovskite structure. Scanning electron microscope indicated that La0.67Ca0.33MnO3 film thickness is approximately 500 nm, and the average grain size of this sample varies between 40 and 50 nm. La0.67Ca0.33MnO3 film showed a phase transition from paramagnetic to ferromagnetic at (TC) 80 K and a metal–insulator transition at (TMI) 77.5 K and at 2 mT magnetic field. The upturn of the resistance observed at low temperatures (<36 K) was attributed to the Coulomb blockade, and the strong structural disorder is due to the large lattice mismatch and strain relaxation. A large magnetoresistance ratio [MR (%)] of 780% was observed at 100 K and 6 T magnetic field.
34 citations
TL;DR: In this paper, the authors reported colossal magnetoresistance at room temperature by introducing disorder to the A-site ordered manganites, SmBaMn2O6, showing the metal to CE-type charge/orbital ordered insulator transition at 375K above room temperature.
Abstract: We report colossal magnetoresistance at room temperature by introducing disorder to the A-site ordered manganites, SmBaMn2O6. SmBaMn2O6 shows the metal to CE-type charge/orbital ordered insulator transition at 375K above room temperature. We have achieved a magnetoresistance effect of 340% at room temperature and 300%–600% around room temperature under 9T in a sintered sample of Sm0.90La0.24Ba0.86Mn2O6. By using a single crystal the magnetoresistance (%) was elevated to 1000% at 9T, a high value for bulk transition-metal oxides.
34 citations
34 citations
TL;DR: In this paper, the Hall effect of the charge carriers was used to find the key parameter for the optimization of large magnetoresistance in non-stoichiometric silver chalcogenides.
Abstract: We describe an attempt to find the key parameter for the optimization of recently discovered large magnetoresistance in non-stoichiometric silver chalcogenides. Our measurements of the resistivity, magnetoresistance and the Hall effect of Ag2Se and their simple analysis lead us to the conclusion that the most important optimization variable is the Hall mobility of the charge carriers. We suggest that the largest magnetoresistance may be expected in the samples with the Hall mobility equal to about 0.1 m2/Vs.
34 citations