Superconductivity, Faraday effect, and optical absorption in the commensurate flux phase of the t - J model

Journal Article · Wed Jan 01 04:00:00 EST 1992 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.45.971· OSTI ID:5132023

Rodriguez, J P ^[1]; Doucot, B ^[2]

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1. Laboratoire de Physique des Solides, Universite Paris-Sud, Baihattiment 510, 91405 Orsay CEDEX (France)
2. Centre de Recherches sur les Tres Basses Temperatures, Centre National de la Recherche Scientifique, 38042 Grenoble CEDEX (France)

Using a large-{ital N} slave-boson formulation of the {ital t}-{ital J} model on the square lattice that has explicit spinon-holon decoupling of the correlated electron, we study the stability and electromagnetic response of the commensurate flux phase in the limit near half filling. A region of stability for the flux phase is found located between a dimer phase region near half filling and a fluxless metallic phase region far from half filling. The commensurate flux phase itself is found to be a superconductor of the anyon type. Furthermore, it is shown that the parity--time-reversal--violating characteristic of this phase results in a frequency-dependent Faraday effect. This effect manifests itself as a zero-field Hall effect in the low-frequency limit, where the off-diagonal conductance scales with the hole concentration. Associated with this result, it is also found that the commensurate flux phase supports a series of optical absorption peaks at energies on the order of {ital J}. Lastly, inclusion of instanton tunneling events in the effective gauge-field action results in the confinement of the spinon and holon degrees of freedom. This confinement effect, however, weakens exponentially as one approaches the Mott transition. The present results are discussed in the context of the high-{ital T}{sub {ital c}} superconducting oxides.

• OSTI ID: 5132023
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 45:2; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

665411* -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTIVITY
ANGULAR MOMENTUM
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ENERGY LEVELS
FARADAY EFFECT
GROUND STATES
HIGH-TC SUPERCONDUCTORS
HOLES
MAGNETIC FLUX
OPTICAL PROPERTIES
PARTICLE PROPERTIES
PHYSICAL PROPERTIES
QUANTIZATION
SPIN
SUPERCONDUCTIVITY
SUPERCONDUCTORS