关键词: d波, 超导, 长程序, t-J模型

Abstract:

It is show n that the one- and the tw o-dimensional t-J model with narrow bands (including nex t nearest-neig hbor hopping, etc.)does no t exhibit s-wave nearest-neighbor, an ex tended η, the general off-site Q and the d_{x² -y²}-w ave pairing long-range orders at any nonzero temperature.These pairing long-range orders w ill also be excluded at zero temperature if an ex cited energy gap opens in the charge excitation spect rum of the system.Our result s hold t rue for arbit rary values of J and for any electron f illings.

Key words: d-wave, superconducting, long-range order, t-J model