Phase transitions of the BTZ black hole in new massive gravity

We investigate thermodynamics of the BTZ black hole in new massive gravity explicitly. For $m^2{\mathrm{\ell }}^2>1\mathrm{/}2$ with $m^2$ the mass parameter of fourth-order terms and ${\mathrm{\ell }}^2$ AdS${}_3$ curvature radius, the Hawking-Page phase transition occurs between the BTZ black hole and AdS (thermal) soliton. For $m^2{\mathrm{\ell }}^2<1\mathrm{/}2$, however, this transition unlikely occurs but a phase transition between the BTZ black hole and the massless BTZ black hole is possible to occur. We may call the latter as the inverse Hawking-Page phase transition and this transition is favored in the new massive gravity.