Thermodynamic limit in the two-qubit quantum Rabi model with spin-spin coupling

The occurrence of a second-order superradiant quantum phase transition is brought to light in a quantum system consisting of two interacting qubits coupled to the same quantized field mode. We introduce an appropriate thermodynamic limit for the integrable two-qubit quantum Rabi model with spin-spin interaction. Namely, this limit is determined by the infinite ratios of the spin-spin and the spin-mode couplings to the mode frequency, regardless of the spin-to-mode frequency ratios.