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Antiferromagnetism and superconductivity of the two-dimensional extended t–J model
Репозиторій DSpace/Manakin
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Antiferromagnetism and superconductivity of the two-dimensional extended t–J model
Тема:
К семидесятилетию антиферромагнетизма
Інший ID:
PACS: 74.20.–z, 74.25.Ha, 71.18+y
Посилання:
Antiferromagnetism and superconductivity
of the two-dimensional extended t–J model / C.T. Shih, J.J. Wu, Y.C. Chen, C.Y. Mou, C.P. Chou, R. Eder, T.K. Lee // Физика низких температур. — 2005. — Т. 31, № 8-9. — С. 995-1001. — Бібліогр.: 39 назв. — англ.
Підтримка:
The work is supported by the National Science
Council in Taiwan with Grant Nos. NSC-93-2112-
M-029-001-, 93-2112-M-007-009-, 93-2112-M-001-018-,
and 93-2112-M029-009. Part of the calculations are
performed in the IBM P690 and PC clusters in the Nation
Center for High-performance Computing in Taiwan,
and the PC clusters of the Department of Physics
and Department of Computer Science and Engineering
of Tunghai University, Taiwan. We are grateful for
their help.
Дата:
2005
Переглядів:
688
Завантажень:
466
Анотація:
The mechanism of high-temperature superconductivity (HTS) and the correlation between the antiferromagnetic long-range order (AFLRO) and superconductivity (SC) phases are the central issues of the study of HTS theory. SC and AFLRO of the hole-doped two-dimensional extended t- J model are studied by the variational Monte Carlo method. The results show that SC is greatly enhanced by the long-range hopping terms t' and t" for the optimal and overdoped cases. The phase of coexisting SC and AFM in the t-J model disappears when t and t" are included. It is concluded that the extended t-J model provides a more accurate description for HTS than the traditional t-J model does. The momentum distribution function n(k) and the shape of Fermi surface play critical roles for establishing the phase diagram of HTS materials.
