Enhanced ferromagnetism and emergence of spin-glass-like transition in pyrochlore compound Dy2Ti2−xVxO7

• The modestly doped samples (x≤0.4) in the Dy2Ti2-xVxO7 system still keep ice state.
• When x=0.5, the spin ice disappears and a spin-glass-like transition occurs.
• The doping of V ions leads to the relief of frustration in the Dy sublattice.
• The properties are relevant to magnetic frustration and local structural disorder.

We have studied the magnetic properties of spin-frustrated compound Dy2Ti2−xVxO7 single crystals. Bulk magnetization data show that ferromagnetic interaction enhances with increasing content of V, resulting from the ferromagnetic interactions between Dy and V ions. It is also found from ac susceptibility that the modestly doped samples (x≤0.4) still keep ice state, demonstrating the robustness of spin ice. When the doped concentration increases up to 0.5, more disorder on B site and internal field associated with V4+ ions would affect the macroscopic ground-state degeneracy and relieve the frustration, leading to the disappearance of spin ice and occurrence of a spin-glass-like transition. The magnetic properties of the system are related to magnetic frustration and local structural disorder.