Holon Pair Condensation and Phase Diagram of High T_c Cuprates

TL;DR

This paper investigates holon pair condensation in high T_c cuprates using a U(1) slave-boson model, revealing a phase diagram with d-wave hole pairing and a stable spin gap.

Contribution

It introduces a model incorporating holon pairing and hole-hole repulsion to analyze the phase diagram of high T_c cuprates.

Findings

Holon pair condensation occurs with d-wave hole pairing.

Spin gap size remains stable below holon pairing temperature.

s-wave holon pairing is favored under d-wave singlet pairing conditions.

Abstract

A possibility of holon (boson) pair condensation is explored for hole doped high T_c cuprates, by using the U(1) slave-boson representation of the t-J Hamiltonian with the inclusion of hole-hole repulsion. A phase diagram of the hole doped high T_c cuprates is deduced by allowing both the holon pairing and spinon pairing. It is shown that the spin gap size remains nearly unchanged below the holon pair condensation temperature. We find that the s-wave holon pairing under the condition of d-wave singlet pairing is preferred, thus allowing d-wave hole pairing.