Thermodynamic properties of magnetically diluted dipolar spin ice

Abstract The alternating susceptibility of Ho 2 Ti 2 O 7 and Ho 1.9 La 0.1 Ti 2 O 7 and specific heat of Dy 2 Ti 2 O 7 and Dy 1.9 Y 0.1 Ti 2 O 7 are reported. Temperature dependence of the relaxation time obtained from susceptibility data of both Ho 2 Ti 2 O 7 and Ho 1.9 La 0.1 Ti 2 O 7 can be described assuming thermally activated relaxation. No indication of λ -like anomaly is observed in specific heat of Dy 1.9 Y 0.1 Ti 2 O 7 . The obtained results suggest that although 5% magnetic dilution reduces the relaxation time it is not sufficient to induce long-range ordering at least down to 100 mK.