Antiferromagnetism and superconductivity of the two-dimensional extended t–J model

• Veröffentlicht in: Физика низких температур
• Datum: 2005
• Hauptverfasser: Shih, C.T., Wu, J.J., Chen, Y.C., Mou, C.Y., Chou, C.P., Eder, R., Lee, T.K.
• Format: Artikel
• Sprache: English
• Veröffentlicht: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2005
• Schlagworte: К семидесятилетию антиферромагнетизма
• Online Zugang: https://nasplib.isofts.kiev.ua/handle/123456789/121694
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Zitieren: 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.

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.