Magnetic transitions and superconductivity in the t-J model

Journal Article · Fri Nov 01 04:00:00 EST 1996 · Journal of Low Temperature Physics

DOI:https://doi.org/10.1007/BF00768452· OSTI ID:457221

Sherman, A ^[1]; Schreiber, M ^[2]

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1. Institute of Physics, Tartu (Estonia)
2. Technische Universitaet, Chemnitz (Germany)

The spectrum of the 2D t-J model is shown to change drastically due to transitions from the long-range to short-range antiferromagnetic order at the hole concentration x {approx} 0.04 and from the short-range order to a completely disordered paramagnetic state at x {approx} 0.19. In the region 0.04 {le} x {le} 0.19 the obtained shape of the Fermi surface, the hole dispersion near the Fermi level, and the density of states on it are in satisfactory agreement with experiment in Bi2212. Based on the obtained spectral functions the Eliashberg formalism is used for calculating T{sub c}. The hole-magnon interaction alone is found to be unable to give rise to superconductivity. By adding a moderate interaction with apex oxygen vibrations high T{sub c} are obtained for even frequency d{sub x{sup 2}-y{sup 2}} pairing in the range 0.04 {le} x {le} 0.17. For larger hole concentrations the odd frequency s-wave solution becomes the leading one which can result in s-wave superconductivity in the overdoped regime with the participation of a hole-phonon interaction of the respective symmetry.

• Sponsoring Organization: USDOE
• OSTI ID: 457221
• Report Number(s): CONF-960808--; CNN: Grant ETF-67; Project EST112.1
• Journal Information: Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 3-4 Vol. 105; ISSN JLTPAC; ISSN 0022-2291
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COPPER OXIDES
DOPED MATERIALS
HIGH-TC SUPERCONDUCTORS
MAGNETIC PROPERTIES
MATHEMATICAL MODELS
PAIRING INTERACTIONS
SUPERCONDUCTIVITY