88 citations · 396 across the 28 of their papers we have counts for
28 papers
The role of the pseudogap in cuprate superconductors revealed by the Hall effect
Júlia C. Anjos, Hércules Santana, E. V. L. de Mello
Cuprate high-temperature superconductors are known to have a normal-state pseudogap but, after many years of intense research, its relation to the superconductivity is still a myst…
Generalization of interlayer tunneling models to cuprate superconductors with charge density waves
Hércules Santana, E. V. L. de Mello
At the beginning of cuprate superconductors, the interlayer tunneling (ILT) and Lawrence-Doniach (L-D) models, which connect the CuO planes by Josephson coupling were considered th…
Calculations of quantum oscillations in cuprate superconductors considering the pseudogap
E. V. L. de Mello
The observations of quantum oscillations in overdoped cuprate superconductors were in agreement with a charge density contained in a cylindrical Fermi surface but the frequencies o…
The BaKFeAs superconducting four-gap temperature evolution: a multi-band Chebyshev-BdG approach
David Moeckli, Evandro Vidor Lins de Mello
We generalize the Chebyshev-Bogoliubov-deGennes method to treat multi-band systems to address the temperature dependence of the superconducting (SC) gaps of iron based superconduct…
Charge disorder and variations of in Zn-doped cuprate superconductors
E. V. L. de Mello, David Möckli
Impurity doping like Zn atoms in cuprates were systematically studied to provide important information on the pseudogap phase because this process substantially reduces witho…
Effective three-band structure in Fe-based superconductors
David Möckli, E. V. L. de Mello
We present self-consistent calculations of the multi-gap structure measured in some Fe-based superconductors. These materials are known to have structural disorder in real space an…
Charge segregation model for superconducting correlations in cuprates above
E. V. L. de Mello, J. E. Sonier
We present a theoretical framework for understanding recent transverse field muon spin rotation (TF-SR) experiments on cuprate superconductors in terms of localized regions of p…
Zero-Field muSR Search for a Time-Reversal-Symmetry-Breaking Mixed Pairing State in Superconducting Ba1-xKxFe2As2
Z. Lotfi Mahyari, A. Cannell, C. Gomez +6
We report the results of a zero-field muon spin relaxation (ZF-muSR) study of superconducting Ba1-xKxFe2As2 (0.5 < x < 0.9) in search of weak spontaneous internal magnetic fields a…
Universal inhomogeneous magnetic-field response in the normal state of cuprate high-Tc superconductors
Z. Lotfi Mahyari, A. Cannell, E. V. L. de Mello +5
We report the results of a muon spin rotation (muSR) study of the bulk of Bi{2+x}Sr{2-x}CaCu2O{8+δ}, as well as pure and Ca-doped YBa2Cu3Oy, which together with prior measurements…
Weak magnetic order in high-Tc superconductors produced by spontaneous Josephson currents
E. V. L. de Mello, David Möckli
We develop a model for high-Tc superconductors based on an electronic phase separation where low-and high-density domains are formed. At low temperatures this system may act as a g…
Theory of the Fermi Arcs, the Pseudogap, and the Anisotropy in k-space of Cuprate Superconductors
E. V. L. de Mello
The appearance of the Fermi arcs or gapless regions at the nodes of the Fermi surface just above the critical temperature is described through self-consistent calculations in an el…
Description of the Oxygen Order evolution and its relation to the Superconducting Transition in
E. V. L. de Mello
The segregation of oxygen in the high critical temperature cuprate superconductor has been systematically studied along the years. In a recent set of experiments, P…
The Disordered Induced Interaction and the Phase Diagram of Cuprates
E. V. L. de Mello, Raphael B. Kasal
There are processes in nature that resemble a true force but arise due to the minimization of the local energy. The most well-known case is the exchange interaction that leads to m…
Resistivity Calculations for Cuprate Superconductor Systems using an Electronic Phase Separation
C. F. S. Pinheiro, E. V. L. de Mello
The resistivity as function of temperature of high temperature superconductors is very unusual and despite its importance lacks an unified theoretical explanation. It is linear wit…
Distinguishing the origin of the superconducting state from the pseudogap of high-temperature superconductors
E. V. L de Mello, Raphael B. Kasal
We consider an electronic phase separation process that generates regions of different charge densities, or local dopings, as the origin of the inhomogeneous charge density of high…
Electronic Phase Separation Transition as the Origin of the Superconductivity and the Pseudogap Phase of Cuprates
E. V. L de Mello, R. B. Kasal, Otton S. T. Filho +1
We propose a new phase of matter, an electronic phase separation transition that starts near the upper pseudogap and segregates the holes into high and low density domains. The Cah…
Nernst effect and Critical Field in Cuprate Superconductors
D. N. Dias, E. S. Caixeiro, E. V. L. de Mello
A series of recent experiments on the Nernst effect, upper critical field and enhanced diamagnetic magnetization by Wang et al (PRB 73, 024510), were interpreted as to…
Heavy fermion d-wave superconductivity: a X-boson approach
Lizardo H. C. M. Nunes, M. S. Figueira, E. V. L. de Melllo
From an extension of the periodic Anderson model (PAM) in the limit taking into account the effect of a nearest neighbor attractive interaction between -electrons…
Heavy fermion superconductivity: X-boson treatment
Lizardo H. C. M. Nunes, M. S. Figueira, E. V. L. de Mello
We use the X-boson method to study the heavy fermion superconductivity employing an extension of the periodic Anderson model in the limit with a nearest neighbor att…
A Theory for High- Superconductors Considering Inhomogeneous Charge Distribution
E. V. L. de Mello, E. S. Caixeiro, J. L. Gonzaléz
We propose a general theory for the critical and pseudogap temperature dependence on the doping concentration for high- oxides, taking into account the charge inho…
Pressure Studies on a High- Superconductor Pseudogap and Critical Temperatures
E. V. L. de Mello, M. T. D. Orlando, J. L. Gonzaléz +2
We report simultaneous hydrostatic pressure studies on the critical temperature and on the pseudogap temperature performed through resistivity measurements on an optima…
BCS Model in Tsallis' Statistical Framework
Lizardo H. C. M. Nunes, E. V. L. de Mello
We show that there is an effect of nonextensivity acting upon the BCS model for superconductors in the ground state that motivates its study in the Tsallis' statistical framework.…
Phase diagram and dependence of the critical temperature T_c on the pressure for Tl_{0.5}Pb_{0.5}Sr_2Ca_{1-x}Y_xCu_2)_7
E. S. Caixeiro, E. V. L. de Mello
Using a mean-field BCS-like approach on the bidimensional extended Hubbard Hamiltonian we calculate the superconducting transition temperature Tc as a function of the hole content…
Crossover behavior for complex order parameter in high-Tc superconductors
E. V. L. de Mello
A number of recent experiments have suggested the presence of either real or complex components in the gap symmetry of high- superconductors (HTSC). In this paper we introduce…