Magnetic phase diagram of a 2-dimensional triangular lattice antiferromagnet Na2BaMn(PO4)2

초록

We report the magnetic phase transitions of a spin-5/2, 2-dimensional triangular lattice antiferromagnet (AFM) Na2BaMn(PO4)(2). From specific heat measurements, we observe two magnetic transitions at temperatures 1.15 and 1.30 K at zero magnetic field. Detailed AC magnetic susceptibility measurements reveal multiple phases including the up arrow up arrow down arrow (up-up-down)-phase between 1.9 and 2.9 T at 47 mK when magnetic field is applied along the c axis, implying that Na2BaMn(PO4)(2) is a classical 2d TL Heisenberg AFM with easy-axis anisotropy. However, it deviates from an ideal model as evidenced by a hump region with hysteresis between the up arrow up arrow down arrow and V-phases and weak phase transitions. Our work provides another experimental example to study frustrated magnetism in 2d TL AFM which also serves as a reference to understand the possible quantum spin liquid behavior and anomalous phase diagrams observed in sibling systems Na2BaMn(PO4)(2) (M = Co, Ni).

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