skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Spin-charge separation in the {ital t}-{ital J} model: Magnetic and transport anomalies

Abstract

A real spin-charge separation scheme is found based on a saddle-point state of the {ital t}-{ital J} model. In the one-dimensional (1D) case, such a saddle-point reproduces the correct asymptotic correlations at the strong-coupling fixed point of the model. In the two-dimensional (2D) case, the transverse gauge field confining spinon and holon is shown to be gapped at {ital finite} {ital doping} so that a spin-charge deconfinement is obtained for its first time in 2D. The gap in the gauge fluctuation disappears at half-filling limit, where a long-range 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 Fermi-liquid system. In spin dynamics, a commensurate antiferromagnetic fluctuation with a small, doping-dependent energy scale is found, which is characterized in momentum space by a Gaussian peak at ({pi}/{ital a},{pi}/{ital a}) with a doping-dependent width. This commensurate magnetic fluctuation contributes a non-Korringa behavior for the NMR spin-lattice relaxation rate. There also exists a characteristic temperature scale below thich a pseudogap behavior appears in the spin dynamics. Furthermore,more » an incommensurate magnetic fluctuation is also obtained at a {ital finite} energy regime. In the transport, a strong-range 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.« less

Authors:
; ;  [1]
  1. Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, Texas 77204-5506 (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; HIGH-TC SUPERCONDUCTORS; PAIRING INTERACTIONS; SPIN-LATTICE RELAXATION; ELECTRIC CONDUCTIVITY; MAGNETIC PROPERTIES; ELECTRONIC STRUCTURE; ONE-DIMENSIONAL CALCULATIONS; TWO-DIMENSIONAL CALCULATIONS

Citation Formats

Weng, Z Y, Sheng, D N, and Ting, C S. Spin-charge 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. Spin-charge 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 . "Spin-charge 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 = {Spin-charge 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 spin-charge separation scheme is found based on a saddle-point state of the {ital t}-{ital J} model. In the one-dimensional (1D) case, such a saddle-point reproduces the correct asymptotic correlations at the strong-coupling fixed point of the model. In the two-dimensional (2D) case, the transverse gauge field confining spinon and holon is shown to be gapped at {ital finite} {ital doping} so that a spin-charge deconfinement is obtained for its first time in 2D. The gap in the gauge fluctuation disappears at half-filling limit, where a long-range 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 Fermi-liquid system. In spin dynamics, a commensurate antiferromagnetic fluctuation with a small, doping-dependent energy scale is found, which is characterized in momentum space by a Gaussian peak at ({pi}/{ital a},{pi}/{ital a}) with a doping-dependent width. This commensurate magnetic fluctuation contributes a non-Korringa behavior for the NMR spin-lattice 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 strong-range 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}
}