Magnetic phase diagram of a 2-dimensional triangular lattice antiferromagnet Na$_2$BaMn(PO$_4$)$_2$

Jaewook Kim; Kyoo Kim; Eunsang Choi; Young Joon Ko; Dong Woo Lee; Sang Ho Lim; Jong Hoon Jung; Seongsu Lee

doi:10.1088/1361-648X/ac965f

paper

Magnetic phase diagram of a 2-dimensional triangular lattice antiferromagnet Na $_{2}$ BaMn(PO $_{4}$ ) $_{2}$

arXiv:2206.01353 · doi:10.1088/1361-648X/ac965f

Abstract

We report the magnetic phase transitions of a spin-5/2, 2-dimensional triangular lattice antiferromagnet (AFM) Na $_{2}$ BaMn(PO $_{4}$ ) $_{2}$ . 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 Na $_{2}$ BaMn(PO $_{4}$ ) $_{2}$ is a classical 2 $d$ 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 2 $d$ TL AFM which also serves as a reference to understand the possible quantum spin liquid behavior and anomalous phase diagrams observed in sibling systems Na $_{2}$ Ba $M$ (PO $_{4}$ ) $_{2}$ ( $M$ = Co, Ni).

Magnetic phase diagram of a 2-dimensional triangular lattice antiferromagnet Na $_{2}$ BaMn(PO $_{4}$ ) $_{2}$

Abstract

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Magnetic phase diagram of a 2-dimensional triangular lattice antiferromagnet Na2​BaMn(PO4​)2​

Abstract

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Magnetic phase diagram of a 2-dimensional triangular lattice antiferromagnet Na $_{2}$ BaMn(PO $_{4}$ ) $_{2}$