Related papers: First order phase transitions driven by in-plane m…

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By using the effective bosonic spin theory, which is recently proposed by Demler and Das Sarma [ Phys. Rev. Lett. 82, 3895 (1999) ], we analyze the effect of an external in-plane magnetic field on the magnetic phase transitions of the…

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The paper is withdrawn by the author because it is superseded by cond-mat/0303357 .

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This paper has been withdrawn due to upload of another version of it as a new preprint: gr-qc/0404097

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This paper has been withdrawn by the author(s), due the following reasons. A similar system for a different purpose has already been studied in Phys.Rev.D60:083001,1999 (astro-ph/9904315). Moreover, our analysis was wrong because we have…

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This paper has been withdrawn by the author(s) due to the discussion was made on the basis of linear term merely, which is incomplete.

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