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N=1 no-scale models describe at tree level the spontaneous breaking ofsupersymmetry at an arbitrary scale m_{3/2}, with vanishing vacuum energy. Wedefine N=1 super no-scale models in string theory as being those, whichmaintain these properties at 1-loop. In other words, in super no-scale models,m_{3/2} is a flat direction of a positive semi-definite 1-loop effectivepotential. We find explicit examples in heterotic Z_2 x Z_2 orbifold models,where N=1 is spontaneously broken by a stringy Scherk-Schwarz mechanism, andwhere the "decompactification problem" does not arise.

Stringy N = 1 super no-scale models