Fermi-surface instabilities of a generalized two-dimensional Hubbard model
- 1 February 1989
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 39 (4) , 2940-2943
- https://doi.org/10.1103/physrevb.39.2940
Abstract
Possible Fermi-surface-related instabilities in a Hubbard model, generalized so as to include finite-range and exchange interactions, are studied in the weak-coupling limit. In addition to the usual instabilities of superconducting, charge- or spin-density-wave type, two new types of instability are found. The first state is an orbital antiferromagnet, with currents circulating around each elementary plaquette. In the second phase, a spin current flows around the plaquettes. In both cases, there are low-temperature power laws in thermodynamic and transport properties. Two-dimensional fluctuation effects are shown to lead, for weak interactions, to a sharp crossover from a Fermi-liquid state to a regime governed by orientational fluctuations of the order parameter at fixed amplitude.Keywords
This publication has 24 references indexed in Scilit:
- Antiferromagnetism and superconductivity in oxygen-deficientPhysical Review Letters, 1988
- First Observation of an Antiferromagnetic Phase in the Y1Ba2Cu3Ox SystemJapanese Journal of Applied Physics, 1987
- Electronic structure of the high Tc superconductor Ba2YCu3O6.9Solid State Communications, 1987
- Evidence for electron-electron correlations in La2CuO4 and La2−xSrxCuO4 superconductorsSolid State Communications, 1987
- Antiferromagnetism inPhysical Review Letters, 1987
- Electronic structure and properties of YBa2Cu3O7-δ, a low dimensional, low density of states superconductorPhysics Letters A, 1987
- Electronic band properties and superconductivity inPhysical Review Letters, 1987
- Electronically driven instabilities and superconductivity in the layered perovskitesPhysical Review Letters, 1987
- Superconductivity at 93 K in a new mixed-phase Y-Ba-Cu-O compound system at ambient pressurePhysical Review Letters, 1987
- Possible highT c superconductivity in the Ba?La?Cu?O systemZeitschrift für Physik B Condensed Matter, 1986