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 K and 1.30 K at zero magnetic field. Detailed AC magnetic susceptibility measurements reveal multiple phases including the ↑↑↓ (up-up-down)-phase between 1.9 T 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 ↑↑↓ 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 Na2BaM(PO4)2 (M = Co, Ni).
@article{arxiv.2206.01353,
title = {Magnetic phase diagram of a 2-dimensional triangular lattice antiferromagnet Na$_2$BaMn(PO$_4$)$_2$},
author = {Jaewook Kim and Kyoo Kim and Eunsang Choi and Young Joon Ko and Dong Woo Lee and Sang Ho Lim and Jong Hoon Jung and Seongsu Lee},
journal= {arXiv preprint arXiv:2206.01353},
year = {2022}
}