Coupled structural collapse and evolution of magnetic phases inSr(Co0.88Ni0.12)2P2under pressure
Brady Wilson1, Shuyuan Huyan2, Juan Schmidt3
1University of South Carolina, 712 Main St. Room 404, Columbia, South Carolina, 29208, United States.
Abstract:
We report high-pressure x-ray diffraction and electrical resistance measurements on Sr(Co0.88Ni0.12)2P2, an itinerant antiferromagnet with the highest Néel temperature (TN= 36 K) among Sr(Co1-xNix)2P2series. Room-temperature diffraction data reveal a pressure-induced transition from an uncollapsed tetragonal (ucT) to a collapsed tetragonal (cT) structure, beginning near 8.4 GPa and completing before 12.4 GPa. This transition is characterized by an expansion of the in-plane a-lattice parameter and a contraction in the c-lattice parameter, resulting in a reduction of the axial ratio c/a. Resistance measurements show a low-pressure anomaly near 38 K, consistent with the reported antiferromagnetic transition. As the room temperature value of the applied pressure exceeds 8 GPa, signs of a partial cT transition appear on cooling with the full cT transition occurring for pressures exceeding 10 GPa. Associated with the cT phase is a much higher temperature ferromagnetic transition with Curie temperature reaching ∼ 190 K before slowly decreasing for higher applied pressures. These results demonstrate strong coupling between the lattice collapse and magnetic behavior in Sr(Co0.88Ni0.12)2P2.
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