CoO2-Layer-Thickness Dependence of Magnetic Properties and Possible Two Different Superconducting States in NaxCoO2.yH2O

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dc.creatorMochizuki, Masahito
dc.creatorOgata, Masao
dc.date2006-10-20
dc.date.accessioned2026-07-07T07:43:48Z
dc.date.available2026-07-07T07:43:48Z
dc.descriptionIn order to understand the experimentally proposed phase diagrams of NaxCoO2.yH2O, we theoretically study the CoO2-layer-thickness dependence of magnetic and superconducting (SC) properties by analyzing a multiorbital Hubbard model using the random phase approximation. When the Co valence (s) is +3.4, we show that the magnetic fluctuation exhibits strong layer-thickness dependence where it is enhanced at finite (zero) momentum in the thicker (thinner) layer system. A magnetic order phase appears sandwiched by two SC phases, consistent with the experiments. These two SC phases have different pairing states where one is the singlet extended s-wave state and the other is the triplet p-wave state. On the other hand, only a triplet p-wave SC phase with dome-shaped behavior of Tc is predicted when s=+3.5, which is also consistent with the experiments. Controversial experimental results on the magnetic properties are also discussed.
dc.description5 pages, 4 figures. Submitted to Journal of the Physical Society of Japan
dc.identifierhttps://arxiv.org/abs/cond-mat/0610562
dc.identifierhttp://arxiv.org/abs/cond-mat/0610562
dc.identifierJ. Phys. Soc. Jpn. 76 (2007) 013704
dc.identifierdoi:10.1143/JPSJ.76.013704
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/122969
dc.subjectStrongly Correlated Electrons
dc.subjectSuperconductivity
dc.titleCoO2-Layer-Thickness Dependence of Magnetic Properties and Possible Two Different Superconducting States in NaxCoO2.yH2O
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