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We study polycrystalline samples of KCu3As2O7(OH)3, a new candidate spin-1/2kagome antiferromagnet, by magnetic susceptibility and heat capacitymeasurements above 2 K. The unique arrangement of the 3z2 - r2 and x2 - y2orbitals on the Cu2+ kagome net is noted and compared to the orbital patternsfound in other kagome minerals. It is suggested that this orbital arrangementgives rise to one antiferromagnetic and two ferromagnetic interactions onisosceles triangles forming a highly distorted kagome lattice. KCu3As2O7(OH)3is found to show an antiferromagnetic long-range order at T_N = 7.2 K.Remarkably, a spin entropy is more gradually released upon cooling below T_Ncompared with a conventional magnetic long-range order, which may originatefrom the geometrical frustration still present in this highly distorted kagomelattice.

Distorted Kagome Lattice Generated by a Unique Orbital Arrangement in the Copper Mineral KCu3As2O7(OH)3