Kim Jaewook, Kim Kyoo, Choi Eunsang, Joon Ko Young, Woo Lee Dong, Ho Lim Sang, Hoon Jung Jong, Lee Seungsu
Korea Atomic Energy Research Institute, Daejeon 34057, Republic of Korea.
National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310-3706, United States of America.
J Phys Condens Matter. 2022 Oct 7;34(47). doi: 10.1088/1361-648X/ac965f.
We report the magnetic phase transitions of a spin-5/2, 2-dimensional triangular lattice antiferromagnet (AFM) NaBaMn(PO). 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-up-down)-phase between 1.9 and 2.9 T at 47 mK when magnetic field is applied along theaxis, implying that NaBaMn(PO)is a classical 2TL Heisenberg AFM with easy-axis anisotropy. However, it deviates from an ideal model as evidenced by a hump region with hysteresis between the↑↑↓and-phases and weak phase transitions. Our work provides another experimental example to study frustrated magnetism in 2TL AFM which also serves as a reference to understand the possible quantum spin liquid behavior and anomalous phase diagrams observed in sibling systems NaBa(PO)(= Co, Ni).
我们报道了自旋为5/2的二维三角晶格反铁磁体（AFM）NaBaMn(PO)的磁相变。通过比热测量，我们在零磁场下观察到温度为1.15 K和1.30 K时的两个磁转变。详细的交流磁化率测量揭示了多个相，包括当磁场沿轴施加时，在47 mK、1.9至2.9 T之间的↑↑↓（上-上-下）相，这意味着NaBaMn(PO)是具有易轴各向异性的经典二维三角晶格海森堡反铁磁体。然而，它偏离了理想模型，这由↑↑↓相和另一相之间具有磁滞的驼峰区域以及弱相变所证明。我们的工作为研究二维三角晶格反铁磁体中的阻挫磁性提供了另一个实验实例，这也为理解在相关体系NaBa(PO)（= Co、Ni）中观察到的可能的量子自旋液体行为和反常相图提供了参考。
