Related papers: withdrawn

This paper has been withdrawn by the authors.

The paper has been withdrawn due to very low reproducibility. About 100 samples have been made, only 3 samples show the superconducting-like behavior. We think it may be an unlikely result.

This paper has been withdrawn by the authors.

This paper has been withdrawn by the authors

This paper has been withdrawn by the author.

This paper has been withdrawn by the author

This paper has been withdrawn by the author, because a better treatment is given in the author's Phd. thesis (Sections 3.4.6 and 4.4), now available on the arxiv.

This paper has been withdrawn by the author due to unspecified problems.

This paper has been withdrawn.

This paper has been withdrawn by the author

This paper has been withdrawn by the author due to essential mistakes in some previous versions.

This paper has been withdrawn. A significantly revised version will be posted in the near future.

This paper has been withdrawn because of the requirement from the journal where the modified version of the paper is to be published.

The paper has been withdrawn by authors. The issues studied in this paper were changed so much that we have published a new paper considering these issues. See hep-th/0406074

This paper has been withdrawn by the author due to an error in the proof.

This paper has been withdrawn by the author due to some errors.

This paper has been withdrawn due to its publication

This paper has been withdrawn by the authors because the paper is largely revised and improved.

This paper has been withdrawn because the content has been substantially improved in a later paper, arXiv:0806.1165.

This paper has been withdrawn by the author due to an error in the last paragraph of step 2 of the main proof, on page 6.