Colossal magnetoresistance in crbased chalcogenide. Such magnetoresistance measurements allow the number of free carriers to be obtained experimentally, as well as allow mapping of the fermi surface etc. Chapter2 32 introduction to colossal magneto resistance. The 2007 nobel prize in physics was awarded to albert fert and peter grunberg for the discovery of gmr. Since the discovery of high temperature super conductivity in cuprate oxides by bednorz and muller 1 in. Colossal magnetoresistance cmr is a property of some materials, mostly manganesebased perovskite oxides, that enables them to dramatically change their electrical resistance in the presence of a magnetic field. The groundstate phase diagram of the spin subsystem coincides. Giant magnetoresistance gmr is a quantum mechanical magnetoresistance effect observed in multilayers composed of alternating ferromagnetic and nonmagnetic conductive layers. Enhancement of magnetoresistance in manganite multilayers. The prototypical cmr compound is derived from the parent compound, perovskite lamno 3. Colossal magnetoresistance cmr refers to a large change in electrical conductivity induced by a magnetic field in the vicinity of a metalinsulator transition and has inspired extensive. We present a detailed study of the dielectric and charge transport properties of the antiferromagnetic cubic spinel hgcr2s4. Colossal magnetoresistance in topological kondo insulator.
Spin colossal magnetoresistance in an antiferromagnetic. Negative magnetoresistance is the term given to the large decrease in the electrical resistance when certain systems are exposed to a magnetic. Scribd is the worlds largest social reading and publishing site. Polaron coherence condensation as the mechanism for colossal magnetoresistance in layered manganites. Liu yukuai, yin yuewei, and li xiaoguang hefei national laboratory for physical sciences at microscale, department of. A nims research group has discovered a new material, nacr2o4, which displays a novel type of colossal magnetoresistance effect. Colossal magnetoresistance manganites and related prototype devices. The magnetoresistance of conventional materials enables changes in resistance of up to 5%, but materials featuring cmr may demonstrate resistance changes by orders of magnitude. Pdf polaron coherence condensation as the mechanism for. Discovery of new colossal magnetoresistance mechanism 28 august 2012 a nims research group has discovered a new material, nacr2o4, which displays a novel type of colossal magnetoresistance effect. Colossal magnetoresistance in topological kondo insulator to cite this article. Discovery of new colossal magnetoresistance mechanism. Colossal magnetocapacitance and colossal magnetoresistance. Associated with this transition is an effect known as colossal magnetoresistance 25 cmrin the vicinity of the transition temperature, the materials exhibit a large change in resistance in.
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