Dielectric critical behaviour at a metal-insulator transition under lattice compression

Shukla, Shailesh ; Deepak Kumar, ; Nath Shukla, Nitya ; Prasad, Rajendra (2005) Dielectric critical behaviour at a metal-insulator transition under lattice compression Journal of Physics and Chemistry of Solids, 66 (7). pp. 1150-1157. ISSN 0022-3697

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/j.jpcs.2005.03.005


We study dielectric critical behaviour around a continuous metal–insulator transition in crystalline Cesium Iodide induced by changing the lattice parameter. The ab initio calculations of band structure and various quantities related to the dielectric response are performed in the transition region, within the local density approximation of the density functional theory. These calculations allow us to establish the power-law singularities of various quantities on two sides of the transition. The exponents obtained here are mean-field like due to the approximation in which interactions and disorder are treated. The critical behaviour is discussed by applying the scaling principle to the wavevector and frequency dependent dielectric function. We further investigate the effect of dielectric anomalies on optical properties by calculating the reflectance around transition region taking the ionic contribution to the dielectric function also into account. We find that the reflectance as a function of frequency shows very different kind of behaviour on both sides of the metal–insulator transition

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:D. Dielectric Properties; D. Critical Phenomena; A. Electronic Materials; D. Optical Properties
ID Code:69546
Deposited On:24 Nov 2011 04:00
Last Modified:24 Nov 2011 04:00

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