On centers of 2-blocks of Suzuki groups
preprint by Gerald Cliff
March 1999

We show that the center of the principal 2-block of the Suzuki
group G=Sz(q), over a field k of characteristic 2, is isomorphic
to the center of the Brauer corresponding block of a Sylow
2-normalizer of G, but the centers of these blocks over a discrete
valuation ring R of characteristic 0, whose residue class field
has characteristic 2, are not isomorphic. These are the first
examples known to the author of blocks whose centers are
isomorphic over k but not R. This also shows that there is no
perfect isometry of the characters in these blocks.