Even and odd-frequency pairing correlations in 1-D t-J-h model: a comparative study

Details Even and odd-frequency pairing correlations in 1-D t-J-h model: a comparative study Even and odd-frequency pairing correlations in 1-D t-J-h model: a comparative study

1993-02-18

arxiv.org/abs/cond-mat/9302027v1

Physics

Condensed Matter

6 pages + 4 figures

Scientific paper

10.1103/PhysRevB.48.7445

An equal time version of odd-frequency pairing for a generalized $t-J$ model is introduced. It is shown that the composite operators describing binding of Cooper pairs with magnetization fluctuations naturally appear in this approach. The pairing correlations in both BCS and odd-frequency channels are investigated exactly in 1D systems with up to 16 sites. Our results indicate that at some range of parameters odd-frequency correlations become comparable, however smaller than BCS pairing correlations. It is speculated that the spin and density fluctuations in the frustrated model lead to the enhancement of the odd gap susceptibilities. 4 postscript figure files are attached at the bottom of the tex file.

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