Phys. Rev. Lett. 64, 475–478 (1990)Phase separation in the t-J modelReceived 20 October 1989; published in the issue dated 22 January 1990 It is shown that, for the t-J model, dilute holes in an antiferromagnet are unstable against phase separation into a hole-rich and a no-hole phase. When the spin-exchange interaction J exceeds a critical value Jc, the hole-rich phase has no electrons. It is proposed that for J slightly less than Jc the hole-rich phase is a low-density superfluid of electron pairs. A brief discussion of phase separation in other related models is given. © 1990 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.64.475
DOI:
10.1103/PhysRevLett.64.475
PACS:
74.65.+n, 75.10.Jm, 75.25.+z
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