Ferromagnetic and triplet-pairing instabilities controlled by the trigonal distortion of the CoO_6 octahedra in Na_xCoO_2*yH_2O

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dc.creatorMochizuki, Masahito
dc.creatorYanase, Youichi
dc.creatorOgata, Masao
dc.date2005-03-10
dc.date2005-06-03
dc.date.accessioned2026-07-07T06:21:58Z
dc.date.available2026-07-07T06:21:58Z
dc.descriptionIn the recently discovered Co-oxide superconductor Na_xCoO_2*yH_2O, the edge-shared CoO6 octahedra are trigonally contracted along the c-axis in the CoO2-plane. We study how this CoO6 distortion affects the magnetic properties and superconductivity in this compound by analyzing the multiorbital Hubbard model using the fluctuation-exchange approximation. It is shown that through generating the trigonal crystal field, the distortion pushes the Co e'g bands up and consequently gives rise to the hole-pocket Fermi surfaces, which have been predicted in the band calculations. As the distortion increases, the hole pockets are enlarged and the ferromagnetic fluctuation as well as the pairing instability increases, which is in good agreement with recent NQR results.
dc.description5 pages, 4 figures. Errata: Ref.[10] in published version should be "Y. Kobayashi, M. Yokoi and M. Sato: J. Phys. Soc. Jpn. 72 (2003) 2161, ibid. 72 (2003) 2453"
dc.identifierhttps://arxiv.org/abs/cond-mat/0503233
dc.identifierhttp://arxiv.org/abs/cond-mat/0503233
dc.identifierJ. Phys. Soc. Jpn. 74 (2005) 1670
dc.identifierdoi:10.1143/JPSJ.74.1670
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/95776
dc.subjectStrongly Correlated Electrons
dc.subjectSuperconductivity
dc.titleFerromagnetic and triplet-pairing instabilities controlled by the trigonal distortion of the CoO_6 octahedra in Na_xCoO_2*yH_2O
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