Characterization of the Spin-Frustration in Doubly Ordered Perovskite NaYbZnWO₆ Obtained by High-Pressure Synthesis

We present the high-pressure synthesis of a novel doubly ordered perovskite NaYbZnWO₆ composed of the rare earth magnetic Yb³⁺ ions and its comprehensive magnetic characterization. The structure consists of alternating layers of Yb³⁺ and Na⁺ ions along the c-axis, with Yb³⁺ ions forming slightly distorted two-dimensional (2D) square lattices of kite-shape (Yb³⁺)₄ units. Low-temperature magnetic susceptibility measurements indicate that the ground state of Yb³⁺ can be described by an effective J_eff = 1/2 Kramers doublet. Further, specific heat analysis reveals an internal magnetic field of the order of 1.48 K; however, magnetization data do not exhibit magnetic ordering down to 0.4 K. The spin exchanges of NaYbZnWO₆ evaluated by density functional theory (DFT) calculations unveil spin frustration in the compound. These findings suggest that NaYbZnWO₆ is a promising candidate for realizing a magnetically disordered quantum state.