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 paper, the phase diagram and critical properties for three-dimensional double exchange model with and without quenched disorder were studied for the case of ferromagnetic magnetoresistance manganites.
Abstract: Phase diagram and critical properties are studied for three-dimensional double-exchange model with and without quenched disorder. Employing the Monte Carlo method and the systematic analysis on the finite-size effect, we estimate the Curie temperature and the critical exponent as functions of the doping concentration and the strength of the random potential. The Curie temperature well scales to the kinetic energy of electrons in the ground state as expected for this kinetics-driven ferromagnetism. The universality class of this transition is described by the short-range Heisenberg fixed point. The results are compared with experimental results in the colossal magnetoresistance manganites.
48 citations
TL;DR: In this article, the role of long-ranged strain interactions in determining the charge and orbital ordering in manganites has been clarified and the strain energy contribution is found to be of order 20-30 meV/Mn and stabilizes the anomalous "zigzag chain" order observed in many half-doped manganite.
Abstract: Theoretical and computational results are presented clarifying the role of long-ranged strain interactions in determining the charge and orbital ordering in colossal magnetoresistance manganites. The strain energy contribution is found to be of order 20-30 meV/Mn and in particular stabilizes the anomalous "zigzag chain" order observed in many half-doped manganites.
48 citations
TL;DR: In this article, the authors show the very different nature of the ferromagnetic state of low-hole-doped manganites with respect to other manganite showing colossal magnetoresistance.
Abstract: In this work we show the very different nature of the ferromagnetic state of the low-hole-doped manganites with respect to other manganites showing colossal magnetoresistance. High-field measurements definitively prove the coexistence of ferromagnetic-metallic and ferromagnetic-insulating regions even when the sample is magnetically saturated, with the ground state being inhomogeneous. We have investigated ${\mathrm{La}}_{0.9}{\mathrm{Ca}}_{0.1}{\mathrm{MnO}}_{3}$ as a prototype compound. A wide characterization by means of magnetic and magnetotransport measurements, neutron diffraction, small-angle neutron scattering, and nuclear magnetic resonance has allowed us to establish that the ground state is based on the existence of disordered nanometric double-exchange metallic clusters that coexist with long-range superexchange-based ferromagnetic insulating regions. Under high magnetic field the system reaches magnetization saturation by aligning the magnetic clusters and the insulating matrix, but even if they grow in size, they do not reach the percolation limit.
48 citations
TL;DR: In this paper, a systematic investigation of magnetization as a function of both magnetic field and temperature has been undertaken, and it has been found from the magnetization versus temperature plot of PCMO that it exhibits reentrant type of spin glass behavior at 44 K.
48 citations
TL;DR: Strong diamagnetism in the Mott insulator calcium ruthenate (Ca2RuO4) induced by dc electric current is reported, suggesting that dc current may be a means to control the properties of materials in the vicinity of a Mottinsulator transition.
Abstract: Mott insulators can host a surprisingly diverse set of quantum phenomena when their frozen electrons are perturbed by various stimuli. Superconductivity, metal-insulator transition, and colossal magnetoresistance induced by element substitution, pressure, and magnetic field are prominent examples. Here we report strong diamagnetism in the Mott insulator calcium ruthenate (Ca2RuO4) induced by dc electric current. The application of a current density of merely 1 ampere per centimeter squared induces diamagnetism stronger than that in other nonsuperconducting materials. This change is coincident with changes in the transport properties as the system becomes semimetallic. These findings suggest that dc current may be a means to control the properties of materials in the vicinity of a Mott insulating transition.
48 citations