Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1999-01-02
Europhys. Lett. 50, 656 (2000)
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, Replaced by the published version
Scientific paper
10.1209/epl/i2000-00320-5
We study the stability of the spin gap phase in the U(1) slave-boson theory of the t-J model in connection to the underdoped cuprates. We approach the spin gap phase from the superconducting state and consider the quantum phase transition of the slave-bosons at zero temperature by introducing vortices in the boson superfluid. At finite temperatures, the properties of the bosons are different from those of the strange metal phase and lead to modified gauge field fluctuations. As a result, the spin gap phase can be stabilized in the quantum critical and quantum disordered regime of the boson system. We also show that the regime of quantum disordered bosons with the paired fermions can be regarded as the strong coupling version of the recently proposed nodal liquid theory.
Kim Yong Baek
Wang Ziqiang
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