Second Critical Point in First Order Metal-Insulator Transitions
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Publisher:American Physical Society
Citation:Ivan Z. Kostadinov, Bruce R. Patton, "Second Critical Point in First Order Metal-Insulator Transitions," Physical Review Letters 101, no. 22 (2008), doi:10.1103/PhysRevLett.101.226407
For first order metal-insulator transitions we show that, together with the dc conductance zero, there is a second critical point where the dielectric constant becomes zero and further turns negative. At this point the metallic reflectivity sharply increases. The two points can be separated by a phase separation state in a 3D disordered system but may tend to merge in 2D. For illustration we evaluate the dielectric function in a simple effective medium approximation and show that at the second point it turns negative. We reproduce the experimental data on a typical Mott insulator such as MnO, demonstrating the presence of the two points clearly. We discuss other experiments for studies of the phase separation state and a similar phase separation in superconductors with insulating inclusions.
Rights:©2008 The American Physical Society
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