We investigate neutral quark matter with homogeneous and inhomogeneous color
condensates at finite temperature in the frame of an extended NJL model. By
calculating the Meissner masses squared and gap susceptibility, the uniform
color superconductor is stable only in a temperature window close to the
critical temperature and becomes unstable against LOFF phase, mixed phase and
gluonic phase at low temperatures. The introduction of the inhomogeneous phases
leads to disappearance of the strange intermediate temperature 2SC/g2SC and
changes the phase diagram of neutral dense quark matter significantly.Comment: 12 pages, 7 figures. v2: references added, accepted for publication
in PRD. V3: Calculation of the neutral LOFF state clarified, typos corrected