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In the article "Mean-field theory for the t-J model" (Physical Review B 40, 2610 (1989)), the authors derived a mean field theory in Slave fermion and Schwinger boson formalism for the t-J model....
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Theoretically, one often use the spin-spin correlation function (which is the sum of 3 terms in the x, y, z directions) to describe ferromagnetic (FM) or anti-ferromagnetic (AFM) order. For...
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