New results for the t-J model in ladders: Changes in the spin liquid state with applied magnetic field. Implications for the cuprates

Details New results for the t-J model in ladders: Changes in the spin liquid state with applied magnetic field. Implications for the cuprates New results for the t-J model in ladders: Changes in the spin liquid state with applied magnetic field. Implications for the cuprates

2004-04-07

arxiv.org/abs/cond-mat/0404157v2

J. Phys.: Condens. Matter 17, 2419 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

16 pages, 7 figures, latex New results added

Scientific paper

10.1088/0953-8984/17/15/013

Exact Diagonalization calculations are presented for the t-J model in the presence of a uniform magnetic field. Results for 2xL ladders (L=8,10,12) and 4x4 square clusters with 1 and 2 holes indicate that the diamagnetic response to a perpendicular magnetic field tends to induce a spin liquid state in the spin background. The zero-field spin liquid state of a two-leg ladder is reinforced by the magnetic field: a considerable increase of rung antiferromagnetic correlations is observed for J/t up to 0.6, for 1 and 2 holes. Pair-breaking is also clearly observed in the ladders and seems to be associated in part with changes promoted by the field in the spin correlations around the zero-field pair. In the 4x4 cluster, the numerical results seem to indicate that the field-induced spin liquid state competes with the zero-field antiferromagnetic short-range-order, the spin liquid state being favored by higher doping and smaller values of J/t. It is interesting to note that the field-effect can also be observed in a 2x2 plaquette with 1 and 2 holes. This opens up the possibility of gaining a qualitative understanding of the effect.

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