Related papers: Absence of superconductivity in the 2D Hubbard mod…
This paper has been withdrawn by the authors, because of serious experimental problems.
The paper has been withdrawn due to very low reproducibility.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This paper has been withdrawn by the author
The paper has been withdrawn by the author because the observed effect has a different origin.
This paper has been withdrawn.
Some issues concerning the question if the two-dimensional Hubbard model really show d-wave superconductivity are briefly discussed.
The paper was withdrawn by the authors
This paper has been withdrawn by the author(s) because some experimental results have not been checked by the last two authors.
This paper has been withdrawn by the authors
This paper has been withdrawn by the author, due to an error in relation (11).
This paper has been withdrawn by the author due to need for more improvement.
The paper has been withdrawn by the author.
This paper has been withdrawn by the authors, due to an error in the proof of Lemma 3.1.
This paper has been withdrawn by the author.
This paper is withdrawn by the authors.
This paper has been withdrawn by the author due to new results to be added.
This paper has been withdrawn by the author due to journal requirement.
The possibility of the superconducting transition in the two-dimensional repulsive Hubbard model is studied using the ladder approximation of the strong coupling diagram technique. The $t$-$U$ and $t$-$t'$-$t''$-$U$ models are considered in…
A refined variational wave function for the two-dimensional repulsive Hubbard model is studied numerically, with the aim of approaching the difficult crossover regime of intermediate values of U. The issue of a superconducting ground state…
This paper was withdrawn because subsequent measurements produced results not always consistent with the ones presented in the paper.