Using an innovative first-principles band theory enabling the exploration of Mott-insulating magnetic cuprates, we study the Fermi surface of underdoped Y(1-x)Ca(x)Ba(2)Cu(3)O(6) in a selection of magnetically ordered and polaronic states. Inclusion of doping on the antiferromagnetically ordered CuO(2) planes causes the appearance of small, hole-like Fermi-surface pockets centered around the nodal points. The pocket properties (area, mass) depend on the underlying magnetic ordering (e.g. change with polaron formation), although the hole-like character is rather persistent for all the examined magnetic states. Copyright (C) EPLA, 2009
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