Spin Dynamics in High Tc Cuprates Based on the U(1) Slave-boson Approach to the t-J Hamiltonian

엄재곤

Published Jan 1, 2003• 0 citations

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Spin Dynamics in High Tc Cuprates Based on the U(1) Slave-boson Approach to the t-J Hamiltonian

엄재곤

Published Jan 1, 2003• 0 citations

OpenAlex

Related papers

An improved slave-boson theory of t-J Hamiltonian for various physical properties of high T C cuprates

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Slave-boson approach to the $t$ - $t'$ - $t''$ - $U$ model applied to electron-doped cupratesSlave-boson approach to the $t$-$t'$-$t''$-$U$ model applied to electron-doped cuprates

Qingshan Yuan, Feng Yuan, C. S. Ting

Bulletin of the American Physical SocietyMar 23, 20050 citations

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Based on an improved SU(2) slave-boson approach showing coupling between the charge and spin degrees of freedom, we derive a phase diagram of high- ${T}_{c}$ cuprates which displays both the superconducting and pseudogap phases in the plane of temperature vs hole doping rate. It is shown that phase fluctuations in the order parameters result in a closer agreement with the observed phase diagram of an arch shape, by manifesting the presence of an optimal doping rate closer to observation, compared to the U(1) slave-boson theory.Based on an improved SU(2) slave-boson approach showing coupling between the charge and spin degrees of freedom, we derive a phase diagram of high-${T}_{c}$ cuprates which displays both the superconducting and pseudogap phases in the plane of temperature vs hole doping rate. It is shown that phase fluctuations in the order parameters result in a closer agreement with the observed phase diagram of an arch shape, by manifesting the presence of an optimal doping rate closer to observation, compared to the U(1) slave-boson theory.

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A possibility of holon (boson) pair condensation is explored for hole-doped high- ${T}_{c}$ cuprates, by using the $U(1)$ slave-boson representation of the $t\ensuremath{-}J$ Hamiltonian with the inclusion of hole-hole repulsion. A phase diagram of the hole doped high- ${T}_{c}$ cuprates is deduced by allowing both the holon pairing and spinon pairing channels. It is shown that the spin gap size remains nearly unchanged below the holon pair condensation temperature. We find that the s-wave holon pairing under the condition of d-wave spin singlet pairing is preferred, thus allowing d-wave hole pairing.A possibility of holon (boson) pair condensation is explored for hole-doped high-${T}_{c}$ cuprates, by using the $U(1)$ slave-boson representation of the $t\ensuremath{-}J$ Hamiltonian with the inclusion of hole-hole repulsion. A phase diagram of the hole doped high-${T}_{c}$ cuprates is deduced by allowing both the holon pairing and spinon pairing channels. It is shown that the spin gap size remains nearly unchanged below the holon pair condensation temperature. We find that the s-wave holon pairing under the condition of d-wave spin singlet pairing is preferred, thus allowing d-wave hole pairing.

arXiv:cond-mat/9812096Physical review. B, Condensed matterSep 1, 199918 citations

Slave-boson approach to the

t

t'

t''

U

model applied to electron-doped cuprates

Based on an improved SU(2) slave-boson approach showing coupling between the charge and spin degrees of freedom, we derive a phase diagram of high-

{T}_{c}

cuprates which displays both the superconducting and pseudogap phases in the plane of temperature vs hole doping rate. It is shown that phase fluctuations in the order parameters result in a closer agreement with the observed phase diagram of an arch shape, by manifesting the presence of an optimal doping rate closer to observation, compared to the U(1) slave-boson theory.

A possibility of holon (boson) pair condensation is explored for hole-doped high-

{T}_{c}

cuprates, by using the

U(1)

slave-boson representation of the $t\ensuremath{-}J$ Hamiltonian with the inclusion of hole-hole repulsion. A phase diagram of the hole doped high-

{T}_{c}

cuprates is deduced by allowing both the holon pairing and spinon pairing channels. It is shown that the spin gap size remains nearly unchanged below the holon pair condensation temperature. We find that the s-wave holon pairing under the condition of d-wave spin singlet pairing is preferred, thus allowing d-wave hole pairing.