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A new type of magnetically frustrated lattice is found in the layeredfluoride NaBa2Mn3F11. A kagome-type array of regular triangles composed of Mn2+ions (spin 5/2) deforms so as to generate the next-nearest-neighbor interactionJ2 between three out of six spins in the hexagon of a normal kagome lattice, inaddition to the nearest-neighbor interaction J1. As a function of |J2/J1|, thislattice can interconnect the kagome (J2 = 0) and the triangular (J2 = J1)lattices and thus is called the kagome-triangular (KT) lattice. Magneticsusceptibility and heat capacity measurements performed on a polycrystallinesample of NaBa2Mn3F11 show an intensive short-range antiferromagneticcorrelation below 14 K probably due to the specific magnetic frustration of theKT lattice. In addition, a long-range order at 2.0 K is observed, which issignificantly low compared with the antiferromagnetic Weiss temperature of 32.3K. Theoretical considerations of Heisenberg spins in the KT lattice revealunique non-coplanar magnetic orders in the case of ferromagnetic J1 andantiferromagnetic J2. NaBa2Mn3F11 may actually exist in this regime accordingto the results of our analysis based on classical Monte-Carlo simulation.

Kagome-Triangular Lattice Antiferromagnet NaBa2Mn3F11