Normal-state magnetic properties of cuprate high-Tc superconductors are interpreted based on the self-consistent solution of the t-J model of Cu-O planes. The solution method retains the rotation symmetry of spin components in the paramagnetic state and has no preset magnetic ordering. The obtained solution is homogeneous. The calculated temperature and concentration dependencies of the magneti...

We establish the existence and uniqueness, in bounded as well unbounded Lipschitz type cylinders of forms UX×VY,t Ω×Rm×R, weak solutions to Cauchy-Dirichlet problems for strongly degenerate parabolic operatorL:=∇X⋅(A(X,Y,t)∇X)+X⋅∇Y−∂t, assuming that A=A(X,Y,t)={ai,j(X,Y,t)} is a real m×m-matrix valued, measurable function such A(X,Y,t) symmetric, uniformly elliptic. Subsequently we solve contin...

G. B. Martins, J. C. Xavier, L. Arrachea, and E. Dagotto National High Magnetic Field Laboratary and Department of Physics, Florida State University, Tallahassee, Florida 32306 Instituto de Fisica Gleb Wataghin, Universidade Estadual de Campinas, Campinas, SP, Brazil Departamento de Fisica, Universidad de Buenos Aires, FCEN, Buenos Aires, DF, Argentina ~Received 16 July 2001; published 22 Octob...

We describe in detail the application of the recent non-Abelian Density Matrix Renormalization Group (DMRG) algorithm to the two dimensional t-J model. This extension of the DMRG algorithm allows us to keep the equivalent of twice as many basis states as the conventional DMRG algorithm for the same amount of computational effort, which permits a deeper understanding of the nature of the ground ...

We study oneand two-hole properties of the t-J model at half-filling on the square lattice using series expansion methods at T50. The dispersion curve for one-hole excitations is calculated and found to be qualitatively similar to that obtained by other methods, but the bandwidth for small t/J is some 20% larger than given previously. We also obtain the binding energy and dispersion relation fo...

Quantized Berry phases as local order parameters in t-J models are studied. A texture pattern of the local order parameters is topologically stable due to the quantization of nonAbelian Berry phases defined by low-energy states below a spin gap, which exists in the large J/t case with a few electrons. We have confirmed that itinerant singlets in the wide class of t-J models carry the nontrivial...

Using the self-consistent Born approximation we calculate Reiter’s wavefunction for a single hole introduced into the undoped and orbitally ordered ground state of the t–J model with t2g orbital degrees of freedom. While the number of excitations is similar to the spin t-J model for a given J/t, a distinct structure of the calculated wavefunction and its momentum dependence is identified sugges...

By expressing the Holstein-Primakoff transformation in a symmetric form a modified spin-polaron technique utilized on triangular-lattice antiferromagnet is developed. With the technique, we have treated an extended t-J model, calculated the quasiparticle dispersion, and we also compared the the dispersion with that obtained by other method. PACS: 74.20.-z, 71.27.+a, 75.30.Gw

The three different sets of Bethe ansatz equations describing the Bethe ansatz solution of the supersymmetric t-J model are known to be equivalent. Here we give a new, simplified proof of this fact which relies on the properties of certain polynomials. We also show that the corresponding transfer matrix eigenvalues agree. PACS: 05.50.+q, 71.10.Fd, 71.10.Pm †e-mail: [email protected]...

The integrability of the one-dimensional long range supersymmetric t-J model has previously been established for both open systems and those closed by periodic boundary conditions through explicit construction of its integrals of motion. Recently the system has been extended to include the effect of magnetic flux, which gives rise to a closed chain with twisted boundary conditions. While the t-...