Hi Yike
Your simulation cell is small and you use no k point sampling. Either you use k point sampling or you enlarge your simulation cell to at least a cell edge length of 12 A in each direction. I suggest the latter option for CP2K. Furthermore, you could reduce EPS_DEFAULT to 1.0E-12 and increase REL_CUTOFF to 60.
HTH
Matthias
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Hi
I guess you have been using DFT-PBE as level of theory for fcc Cu. In that case, a deviation of only 0.03 A for the relaxed lattice constant compared to experiment seems to me acceptable. DFT-GGA is known to give often too large lattice constants.
M.
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