Thermodynamic and electric properties of anisotropic compressible Hall stat
es at higher Landau levels are studied using a mean field theory on the von
Neumann lattice basis. It is shown that resistances agree with the recent
experiments of anisotropic compressible states and the states have negative
pressure. As implications, the collapse phenomena of the integer quantum H
all effect are discussed. (C) 2001 Elsevier Science B.V. All rights reserve
d.