  We report the low-temperature magnetothermal properties and spin dynamics of
a mixed pyrochlore, Dy2GaSbO7 through the coordination of measurements of dc
magnetization, ac susceptibility, and heat capacity, and CF computation. In
Dy2GaSbO7, the spins freeze at temperature Tice = 3.1 K, corresponding to
dynamical spin-freezing into a disordered state in compliance with the spin-ice
rules, but with enhanced zero-point entropy, unlike cannonical dipolar spin-ice
materials, Dy2Ti2O7 and Ho2Ti2O7, due to random disorder and varied chemical
pressure of B-site (GaSb tetrahedra) ions.
