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We present a novel hydrated layered manganate MgMn$_3$O$_7$$\cdot$3H$_2$O asa maple-leaf-lattice (MLL) antiferromagnet candidate. The MLL is obtained byregularly depleting 1/7 of the lattice points from a triangular lattice so thatthe magnetic connectivity $z = 5$ and is thus intermediately frustrated betweenthe triangular ($z = 6$) and kagom\'e ($z = 4$) lattices. InMgMn$_3$O$_7$$\cdot$3H$_2$O, the Mn$^{4+}$ ions, carrying Heisenberg spin 3/2,form a regular MLL lattice in the quasi-two-dimensional structure.Magnetization and heat capacity measurements using a hydrothermally-preparedpowder sample reveal successive antiferromagnetic transitions at 5 and 15 K. Ahigh-field magnetization curve up to 60 T at 1.3 K exhibits a multi-stepplateau-like anomaly. We discuss the unique frustration of the MLLantiferromagnet in which the chiraldegree of freedom may play an importantrole.

Frustrated Magnetism of the Maple-Leaf-Lattice Antiferromagnet MgMn$_3$O$_7$$\cdot$3H$_2$O