Possible Pairing Symmetry of Superconductor Na_xCoO_2yH_2O

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dc.creatorNisikawa, Yunori
dc.creatorIkeda, Hiroaki
dc.creatorYamada, Kosaku
dc.date2004-01-29
dc.date2006-04-18
dc.date.accessioned2026-07-07T06:34:50Z
dc.date.available2026-07-07T06:34:50Z
dc.descriptionTo discuss a possibility that the superconductivities in Na_xCoO_2yH_2O are induced by the electron correlation, we investigate the possible pairing symmetry based on the single-band Hubbard model whose dispersion of the bare energy band is obtained by using FLAPW-LDA band structure calculation of Na_xCoO_2yH_2O. The superconducting transition temperature is estimated by solving the Eliashberg equation. In this equation, both normal and anomalous self-energies are calculated up to the third-order terms with respect to the Coulomb repulsion. In the case of spin-singlet pairing, the candidate of pairing symmetry (the maximum eigen value λ_max^SS of Eliashberg's equation) belongs to d-wave(E_2 representation of D_6 group). In the case of spin-triplet pairing, the candidate of pairing symmetry (the maximum eigen value λ_max^ST of Eliashberg's equation) belongs to f_{y(y^{2}-3x^{2})}-wave (B_1 representation of D_6 group). It is found that λ_max^SS\simeqλ_max^ST and the transition temperatures of unconventional pairing state are estimated to be low compared with observed temperature within our simple model.
dc.description10 pages, 5 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0401595
dc.identifierhttp://arxiv.org/abs/cond-mat/0401595
dc.identifierJ. Phys. Soc. Jpn. 73, 1127-1130 (2004)
dc.identifierdoi:10.1143/JPSJ.73.1127
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/99645
dc.subjectSuperconductivity
dc.subjectMaterials Science
dc.titlePossible Pairing Symmetry of Superconductor Na_xCoO_2yH_2O
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