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Colossal resistivity change associated with the charge ordered / disordered transition: Monte Carlo study |
| DONG Shuai1, ZHU Han2, LIU Jun-ming3 |
| 1.Nanjing National Laboratory of Microstructures, Nanjing University, Nanjing 210093, China; 2.Department of Physics, Princeton University, Princeton, New Jersey 08544, USA; 3.Nanjing National Laboratory of Microstructures, Nanjing University, Nanjing 210093, China; International Center for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, China |
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Abstract Earlier theoretical approaches to manganites mainly stem from magnetic framework in which the electronic transports are thought to be spin-dependent and the double exchange plays a vital role. However, quite a number of experimental observations cannot be explained in the magnetic framework, yet. For example, multiplicate insulator-metal transitions and resistivity reduction induced by perturbations other than magnetic field, such as electric current, are not well understood in this framework. Here we present a comprehensive analysis on the magnetic framework and give a Monte Carlo study on the resistivity of a charge ordered/disordered model without accounting for the spin degree of freedom. The result shows a colossal resistivity change as a resultant of the transition between two types of insulated states. This transition has intrinsic difference from the popular insulated-to-metallic transition in the magnetic framework. The present scenario can be used to explain some experimental facts for electronic transports in manganites, which are not accessible in the magnetic framework.
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Issue Date: 05 September 2006
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