G. B. Martins | Researchain

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Physical Review Letters | 2002

Superconductivity in the two-dimensional t-J model

Sandro Sorella; G. B. Martins; Federico Becca; C. J. Gazza; Luca Capriotti; Alberto Parola; Elbio Dagotto

Using computational techniques, it is shown that pairing is a robust property of hole-doped antiferromagnetic insulators. In one dimension and for two-leg ladder systems, a BCS-like variational wave function with long-bond spin singlets and a Jastrow factor provides an accurate representation of the ground state of the t-J model, even though strong quantum fluctuations destroy the off-diagonal superconducting long-range order in this case. However, in two dimensions it is argued-and numerically confirmed using several techniques, especially quantum Monte Carlo-that quantum fluctuations are not strong enough to suppress superconductivity.

Physical Review B | 2001

Magnetic properties of the frustrated antiferromagnetic spinel ZnCr_ {2} O_ {4} and the spin-glass Zn_ {1-x} Cd_ {x} Cr_ {2} O_ {4}(x= 0.05‚ 0.10)

H. Martinho; N. O. Moreno; J. A. Sanjurjo; C. Rettori; Angel J. Garcia-Adeva; D. L. Huber; S. B. Oseroff; W. Ratcliff Ii; S.-W. Cheong; P. G. Pagliuso; J. L. Sarrao; G. B. Martins

The

Physical Review B | 2008

Transport properties and Kondo correlations in nanostructures: Time-dependent DMRG method applied to quantum dots coupled to Wilson chains

Luis G. G. V. Dias da Silva; F. Heidrich-Meisner; Adrian E. Feiguin; C. A. Büsser; G. B. Martins; E. V. Anda; Elbio Dagotto

Physical Review Letters | 1997

LOCAL ENHANCEMENT OF ANTIFERROMAGNETIC CORRELATIONS BY NONMAGNETIC IMPURITIES

G. B. Martins; Markus Laukamp; Jose Riera; Elbio Dagotto

-dependence (2- 400 K) of the electron paramagnetic resonance (EPR), magnetic susceptibility,

Physical Review B | 1998

ENHANCEMENT OF ANTIFERROMAGNETIC CORRELATIONS INDUCED BY NONMAGNETIC IMPURITIES : ORIGIN AND PREDICTIONS FOR NMR EXPERIMENTS

Markus Laukamp; G. B. Martins; Claudio J. Gazza; André Luiz Malvezzi; Elbio Dagotto; Patricia M. Hansen; Alfredo C. Lopez; Jose Riera

\chi (T)

Physical Review B | 2010

Neutron and ARPES constraints on the couplings of the multiorbital Hubbard model for the iron pnictides

Qinlong Luo; G. B. Martins; Dao-Xin Yao; Maria Daghofer; Rong Yu; Adriana Moreo; Elbio Dagotto

, and specific heat,

Physical Review B | 2007

Numerical results indicate a half-filling SU(4) Kondo state in carbon nanotubes

C. A. Büsser; G. B. Martins

C_{v}(T)

Physical Review B | 2008

Method to study highly correlated nanostructures: The logarithmic-discretization embedded-cluster approximation

E. V. Anda; G. Chiappe; C. A. Büsser; Maria A. Davidovich; G. B. Martins; F. Heidrich-Meisner; Elbio Dagotto

, of the

Physical Review B | 2004

Interference effects in the conductance of multilevel quantum dots

C. A. Büsser; G. B. Martins; K. A. Al-Hassanieh; Adriana Moreo; Elbio Dagotto

normal

Physical Review Letters | 2005

Electron transport through a molecular conductor with center-of-mass motion.

K. A. Al-Hassanieh; C. A. Büsser; G. B. Martins; Elbio Dagotto

antiferromagnetic (AFM) spinel ZnCr

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