posted on 2024-07-10, 21:29authored byTianyu Wang, Ruixin Guo, Qingxiong Liu, Qian Wu, Xianghe Meng, Zhengyang Zhou, Shu Guo, Mingjun Xia
Rare-earth (RE)-based frustrated magnets
are fertile
playgrounds for discovering exotic quantum phenomena and exploring
adiabatic demagnetization refrigeration applications. Here, we report
the synthesis, structure, and magnetic properties of a family of rare-earth
cyanurates RE5(C3N3O3)(OH)12 (RE = Gd–Lu)
with an acentric space group P6̅2m. Magnetic susceptibility χ(T) and isothermal
magnetization M(H) measurements
manifest that RE5(C3N3O3)(OH)12 (RE = Gd, Dy–Yb)
compounds exhibit no magnetic ordering down to 2 K, while Tb5(C3N3O3)(OH)12 shows
long-range magnetic ordering around 3.6 K. Among them, magnetically
frustrated spin-7/2 Gd5(C3N3O3)(OH)12 shows long-range magnetic
ordering around 1.25 K and a large magnetocaloric effect with a maximum
magnetic entropy change ΔSm of up
to 58.1 J kg–1 K–1 at ΔH = 7 T at liquid-helium temperature regimes.