  We present a first numerical evidence for the existence of a novel magnetic
condensate proposed recently by one of the authors in SU(2) Yang-Mills theory.
In our framework, the spontaneously generated color magnetic field identified
with the Savvidy vacuum has the microscopic origin and is a consequence of the
intrinsic dynamics of the Yang-Mills theory. It strongly suggests the
Nielsen--Olesen instability of the Savvidy vacuum disappears and the stability
is restored without the need of the Copenhagen vacuum. The implications to the
Faddeev-Skyrme model are also discussed. These results are obtained through the
first implementation of the Cho--Faddeev--Niemi decomposition of the Yang-Mills
field on a lattice.
