
講演題目: Phase Diagram and Hole Pairing of High Tc Superconductors
Based on Extended t-J Hamiltonian
講 師 : Prof.Sung-Ho Salk
(Pohang University)
日 時 : 平成11年2月10日(水) 15:30 ~ 17:00
場 所 : 北海道大学理学部2号館大学院講義室(2-2-11)

要 旨 :
A variety of experimentally observed phase diagrams of high Tc cuprates are
briefly reviewed with emphasis on pseudogap phase. Based on the experimental
results, we focus our attention to both the spin gap phase and the d-wave
superconducting phase for hole doped high Tc cuprates. By introducing an
extended t-J Hamiltonian with a hole-hole interaction term and its slave-boson
representaion, we derive a computed phase diagram and discuss the pseudogap
phase including the superconducting phase of holon pair condensation. Further
both the U(1) and SU(2) slave boson theory of Lee and coworkers will be compared
with our results of holon pair condensation. 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 singlet pairing is
preferred, thus allowing the formation of d-wave hole pair.

世話人 小田 研(011-706-3575、moda@sci.hokudai.ac.jp)
北海道大学・大学院理学研究科・物理学専攻

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