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16 April 2024 |
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Competing ferromagnetism in high temperature copper oxide superconductors | | Angela Kopp
; Amit Ghosal
; Sudip Chakravarty
; | | Date: |
15 Jun 2006 | | Subject: | Superconductivity; Strongly Correlated Electrons | | Abstract: | The extreme variability of observables across the phase diagram of the cuprate high temperature superconductors has remained a profound mystery, with no convincing explanation of the superconducting dome. While much attention has been paid to the underdoped regime of the hole-doped cuprates because of its proximity to a complex Mott insulating phase, little attention has been paid to the overdoped regime. Experiments are beginning to reveal that the phenomenology of the overdoped regime is just as puzzling. For example, while the electrons form a Fermi liquid, the interactions are exceedingly strong; any trace of Mott phenomena, as signified by incommensurate antiferromagnetic fluctuations, is absent, and the uniform susceptibility shows a ferromagnetic upturn. Here we show and justify that many of these puzzles can be resolved if we assume that competing ferromagnetic fluctuations are simultaneously present with superconductivity. Our approach places competing order as the root of the complexity of the cuprate phase diagram. We propose new experiments, and make new predictions, to test our theory and suggest that effort must be mounted to elucidate the nature of the overdoped regime, if the problem of high temperature superconductivity is to be solved. | | Source: | arXiv, cond-mat/0606431 | | Services: | Forum | Review | PDF | Favorites | |
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