Antiferromagnetism and phase separation in the t-J model at low doping: a variational study

Details Antiferromagnetism and phase separation in the t-J model at low doping: a variational study Antiferromagnetism and phase separation in the t-J model at low doping: a variational study

2003-09-10

arxiv.org/abs/cond-mat/0309265v2

Phys. Rev. B 70, 104503 (2004)

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures, reference added

Scientific paper

10.1103/PhysRevB.70.104503

Using Gutzwiller-projected wave functions, I estimate the ground-state energy of the t-J model for several variational states relevant for high-temperature cuprate superconductors. The results indicate antiferromagnetism and phase separation at low doping both in the superconducting state and in the staggered-flux normal state proposed for the vortex cores. While phase separation in the underdoped superconducting state may be relevant for the stripe formation mechanism, the results for the normal state suggest that similar charge inhomogeneities may also appear in vortex cores up to relatively high doping values.

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