Quantum-disordered slave-boson theory of underdoped cuprates
Department of Physics, The Ohio State University - Columbus, OH 43210, USA
2 Department of Physics, Boston College - Chestnut Hill, MA 02167, USA
Accepted: 25 March 2000
We study the stability of the spin gap phase in the U(1) slave-boson theory of the t-J model in connection with 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 in 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 (QC) and quantum-disordered (QD) regime of the boson system. We also show that the regime of QD bosons with the paired fermions can be regarded as a strong-coupling version of the recently proposed nodal liquid theory.
PACS: 74.25.Jb – Electronic structure / 71.27.+a – Strongly correlated electron systems; heavy fermions / 74.25.-q – General properties; correlations between physical properties in normal and superconducting states
© EDP Sciences, 2000