The induced electrorheological solid has thick columns in the field direction (z axis), spreading between two electrodes. The ground state is proposed to be a body-centered tetragonal lattice with a₁= {}6 ax^, a₂= {}6 ay^, and a₃=2az^, where a is the radius of dielectric spheres. This bct lattice can be regarded as a compound of chains of class A and B, where chains B are obtained from chains A by shifting a distance a in the z direction.
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Tao et al. (1991) studied this question.
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