Ginzburg-Landau theory of the spin-charge-separated system

Journal Article · Tue Dec 31 23:00:00 EST 1991 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.45.966· OSTI ID:5132880

Nagaosa, N ^[1]; Lee, P A ^[2]

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1. Department of Applied Physics, University of Tokyo, Tokyo 113 (Japan)
2. Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)

The phenomenological Ginzburg-Landau theory is developed for the resonating-valence-bond state where the spin and charge degrees of freedom are separated. We have the two order parameters corresponding to the fermion pairing and the Bose condensation, respectively, which are coupled with the gauge field. We find only one transition temperature which is the superconducting {ital T}{sub {ital c}}. Above {ital T}{sub {ital c}}, a crossover occurs from the spin-charge-separated phase to the Fermi liquid as the concentration of holes is increased. Below {ital T}{sub {ital c}}, the penetration length {lambda} is given by {lambda}{sup 2}={lambda}{sub {ital F}}{sup 2}+{lambda}{sub {ital B}}{sup 2}. The coherence length {xi}, on the other hand, is complicated but is predicted to increase rapidly as the concentration approaches the overdoped region. There are two types of the vortex structure with the flux quantization {ital hc}/2{ital e} and {ital hc}/{ital e}, respectively. In the mean-field theory and the type-II limit, the former is stable in almost all the cases, but the latter becomes stable near {ital T}{sub {ital c}} in the low-hole-concentration region.

• OSTI ID: 5132880
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 45:2; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

665000* -- Physics of Condensed Matter-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BOSE-EINSTEIN CONDENSATION
COOPER PAIRS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FERMI GAS
FLUIDS
FLUX QUANTIZATION
GASES
GINZBURG-LANDAU THEORY
HOLES
MATHEMATICAL MODELS
ORDER PARAMETERS
PHYSICAL PROPERTIES
STATISTICAL MODELS
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE