Ground-state and finite-temperature properties of spin liquid phase in the J1–J2J1–J2 honeycomb model

• At zero temperature we find that an exotic spin liquid state lies in 0.21• Temperature and magnetic-field dependences of specific heat, magnetic susceptibility and Knight shift are presented.
• Spin correlation in spin liquid phase shows a low-temperature exponential behavior, and a self-protecting and robust characteristics with respect to an external magnetic field.

In this paper we analyze the groundstate and finite-temperature properties of a frustrated Heisenberg J1–J2J1–J2 model on a honeycomb lattice by employing the Schwinger boson technique. The phase diagram and spin gap as functions of J2/J1J2/J1 are presented, showing that the exotic spin liquid phase lies in 0.21