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

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

Research output: Contribution to journalArticlepeer-review


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-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 ↑↑↓ 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).

Original languageEnglish
Article number475803
JournalJournal of Physics Condensed Matter
Issue number47
Publication statusPublished - 2022 Nov 21
Externally publishedYes


  • NaBaMn(PO)
  • magnetic phase diagram
  • triangular lattice antiferromagnet

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics


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