Navegando por Autor "Mello, Evandro Vidor Lins de"
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Item Competing orders and the resistivity curves of cuprate superconductors.(2010) Mello, Evandro Vidor Lins de; Pinheiro, Carlos Felipe SaraivaThe resistivity as function of temperature of high temperature superconductors (HTSC) is an important property of cuprates but it still lacks a widely accepted explanation. Here we show that the overall behavior of an entire series can be explained by calculations using an electronic phase segregation into two main component phases.Item Random resistivity network calculations for cuprate superconductors with an electronic phase separation transition.(2012) Pinheiro, Carlos Felipe Saraiva; Mello, Evandro Vidor Lins deThe resistivity as a function of temperature for high temperature superconductors is very unusual and, despite its importance, lacks a unified theoretical explanation. It is linear with the temperature for overdoped compounds but it falls more quickly as the doping level decreases. The resistivity of underdoped cuprates increases like that of an insulator below a characteristic temperature where it shows a minimum. We show that this overall behavior can be explained by calculations using an electronicphase segregation into two main component phases with low and high electronic densities. The total resistance is calculated from the various contributions through several processes of random picking of the local resistivities and using a common statistical random resistor network approach.