Pyrochlore quantum spin ice?

Is the Yb2Ti2O7 pyrochlore a quantum spin ice?
R. Applegate, N. R. Hayre, R. R. P. Singh, T. Lin, A. G. R. Day, and M. J. P. Gingras
ArXiv 1203.4569 (2012)

Specific heat, C(T ), per mole of Yb for the model parameters in Ref. [18], in units of the Boltzmann constant
kB, calculated via NLC (up to 4th order NLC together with Euler extrapolations) are compared with experimental data
for Yb2Ti2O7. The black circles are data from Ref.