Upperbound on Squark Masses in Gauge-Mediation Model with Light   Gravitino
  We examine stabilities of our supersymmetry-breaking false vacuum in a low-energy direct gauge mediation model of SUSY breaking. The stability required in the high-temperature early universe leads to upperbounds on masses of squarks and gluino as m_\tilde{q} \lesssim 1 TeV and m_\tilde{g} \lesssim 1 TeV for the light gravitino of mass m_{3/2} \lesssim 16 eV. 
Junji Hisano, Minoru Nagai, Shohei Sugiyama, and T. T. Yanagida