Studies of electronic structure of solids have concentrated mainly on Hilbert space properties such as energy-band structures and density of states, as well as some properties that can be reduced from them. Here, we report application of the topological charge density analysis to crystals. It is found that the pseudoatoms (or nonnuclear attractors, which are charge accumulations in nonnuclear regions), first found in Liz, exist in solid lithium and sodium as well. In the former, the pseudoatoms form a connected network; in the latter, they are separated from one another. Although such networks obey the space group symmetry of the corresponding crystal, their existence is an intrinsic property of a specific crystal. 0 1993 John Wiley

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Comments are short papers which criticize or correct papers of other authors preuiously published in the Physical Review. Each Comment should state clearly to which paper it refers and must be accompanied by a brief abstract. The same publication schedule as for regular articles is followed, and page proofs are sent to authors Comment on "Flux quantization in rings for Hubbard (attractive and repulsive) and t-J-like Hamiltonians"

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