Spincharge separation in the {ital t}{ital J} model: Magnetic and transport anomalies
Abstract
A real spincharge separation scheme is found based on a saddlepoint state of the {ital t}{ital J} model. In the onedimensional (1D) case, such a saddlepoint reproduces the correct asymptotic correlations at the strongcoupling fixed point of the model. In the twodimensional (2D) case, the transverse gauge field confining spinon and holon is shown to be gapped at {ital finite} {ital doping} so that a spincharge deconfinement is obtained for its first time in 2D. The gap in the gauge fluctuation disappears at halffilling limit, where a longrange antiferromagnetic order is recovered at zero temperature and spinons become confined. The most interesting features of spin dynamics and transport are exhibited at finite doping where exotic {ital residual} couplings between spin and charge degrees of freedom lead to systematic anomalies with regard to a Fermiliquid system. In spin dynamics, a commensurate antiferromagnetic fluctuation with a small, dopingdependent energy scale is found, which is characterized in momentum space by a Gaussian peak at ({pi}/{ital a},{pi}/{ital a}) with a dopingdependent width. This commensurate magnetic fluctuation contributes a nonKorringa behavior for the NMR spinlattice relaxation rate. There also exists a characteristic temperature scale below thich a pseudogap behavior appears in the spin dynamics. Furthermore,more »
 Authors:

 Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, Texas 772045506 (United States)
 Publication Date:
 OSTI Identifier:
 82372
 Resource Type:
 Journal Article
 Journal Name:
 Physical Review, B: Condensed Matter
 Additional Journal Information:
 Journal Volume: 52; Journal Issue: 1; Other Information: PBD: 1 Jul 1995
 Country of Publication:
 United States
 Language:
 English
 Subject:
 66 PHYSICS; CRYSTAL MODELS; COLLECTIVE EXCITATIONS; HIGHTC SUPERCONDUCTORS; PAIRING INTERACTIONS; SPINLATTICE RELAXATION; ELECTRIC CONDUCTIVITY; MAGNETIC PROPERTIES; ELECTRONIC STRUCTURE; ONEDIMENSIONAL CALCULATIONS; TWODIMENSIONAL CALCULATIONS
Citation Formats
Weng, Z Y, Sheng, D N, and Ting, C S. Spincharge separation in the {ital t}{ital J} model: Magnetic and transport anomalies. United States: N. p., 1995.
Web. doi:10.1103/PhysRevB.52.637.
Weng, Z Y, Sheng, D N, & Ting, C S. Spincharge separation in the {ital t}{ital J} model: Magnetic and transport anomalies. United States. https://doi.org/10.1103/PhysRevB.52.637
Weng, Z Y, Sheng, D N, and Ting, C S. Sat .
"Spincharge separation in the {ital t}{ital J} model: Magnetic and transport anomalies". United States. https://doi.org/10.1103/PhysRevB.52.637.
@article{osti_82372,
title = {Spincharge separation in the {ital t}{ital J} model: Magnetic and transport anomalies},
author = {Weng, Z Y and Sheng, D N and Ting, C S},
abstractNote = {A real spincharge separation scheme is found based on a saddlepoint state of the {ital t}{ital J} model. In the onedimensional (1D) case, such a saddlepoint reproduces the correct asymptotic correlations at the strongcoupling fixed point of the model. In the twodimensional (2D) case, the transverse gauge field confining spinon and holon is shown to be gapped at {ital finite} {ital doping} so that a spincharge deconfinement is obtained for its first time in 2D. The gap in the gauge fluctuation disappears at halffilling limit, where a longrange antiferromagnetic order is recovered at zero temperature and spinons become confined. The most interesting features of spin dynamics and transport are exhibited at finite doping where exotic {ital residual} couplings between spin and charge degrees of freedom lead to systematic anomalies with regard to a Fermiliquid system. In spin dynamics, a commensurate antiferromagnetic fluctuation with a small, dopingdependent energy scale is found, which is characterized in momentum space by a Gaussian peak at ({pi}/{ital a},{pi}/{ital a}) with a dopingdependent width. This commensurate magnetic fluctuation contributes a nonKorringa behavior for the NMR spinlattice relaxation rate. There also exists a characteristic temperature scale below thich a pseudogap behavior appears in the spin dynamics. Furthermore, an incommensurate magnetic fluctuation is also obtained at a {ital finite} energy regime. In the transport, a strongrange phase intereference leads to an effective holon Lagrangian which can give rise to a series of interesting phenomena including linear{ital T} resistivity and a {ital T}{sup 2} Hall angle. We discuss the striking similarities of these theoretical features with those found in the high{ital T}{sub {ital c}} cuprates and give a consistent picture for the latter. Electronic properties like Fermi surface and superconducting pairing in this framework are also discussed.},
doi = {10.1103/PhysRevB.52.637},
url = {https://www.osti.gov/biblio/82372},
journal = {Physical Review, B: Condensed Matter},
number = 1,
volume = 52,
place = {United States},
year = {1995},
month = {7}
}