Low‐Temperature Studies on Spin‐Ice Behavior in Frustrated Pyrochlore‐Dy ₂ Ti ₂ O ₇

Dy 2 Ti 2 O 7 is a well‐known member of the pyrochlore family, having an exotic ground state like spin ice, as the weakly interacting Ising spins of each tetrahedron follow the two‐in, two‐out ice rule. A low‐temperature study to understand this novel ground state is carried out using heat capacity and magnetization with no noticeable magnetic ordering. Heat capacity shows a broad anomaly around 1 K, indicative of short‐range interactions. Residual entropy of the spin‐ice state in zero magnetic field is 1.36 JK −1 mol −1 which is close to the Pauling prediction. Kagome‐ice state is to be formed when a magnetic field is applied, and residual entropy is 0.56 JK −1 mol −1 between 0.3 Tand 0.6 T, which matches the literature. A magnetic field–temperature (H–T) phase diagram has been visualized for the spin‐ice configuration. Observation of small yet clear peak structures around 0.2 K may be assigned to the first‐order (gas–liquid) transition below 0.4 K inside the Kagome‐ice state.