Collinear Order In The Spin-5/2 Triangular-lattice Antiferromagnet Na 3 ...

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Collinear order in the spin-5/2 triangular-lattice antiferromagnet Na3Fe (PO4)2

• Sebastian, Sebin J.
;
• Islam, S. S.
;
• Jain, A.
;
• Yusuf, S. M.
;
• Uhlarz, M.
;
• Nath, R.

Abstract

We set forth the structural and magnetic properties of the frustrated spin-5 /2 triangle lattice antiferromagnet Na3Fe (PO4)2 examined via x-ray diffraction, magnetization, heat capacity, and neutron diffraction measurements on the polycrystalline sample. No structural distortion was detected from the temperature-dependent x-ray diffraction down to 12.5 K, except a systematic lattice contraction. The magnetic susceptibility at high temperatures agrees well with the high-temperature series expansion for a spin-5 /2 isotropic triangular lattice antiferromagnet with an average exchange coupling of J /kB≃1.8 K rather than a one-dimensional spin-5 /2 chain model. This value of the exchange coupling is consistently reproduced by the saturation field of the pulse field magnetization data. It undergoes a magnetic long-range order at TN≃10.4 K. Neutron diffraction experiments elucidate a collinear antiferromagnetic ordering below TN with the propagation vector k =(1 ,0 ,0 ) . An intermediate value of frustration ratio (f ≃3.6 ) reflects moderate frustration in the compound which is corroborated by a reduced ordered magnetic moment of ∼1.52 μB at 1.6 K, compared to its classical value (5 μB ). Magnetic isotherms exhibit a change of slope envisaging a field induced spin-flop transition at HSF≃3.2 T. The magnetic field vs temperature phase diagram clearly unfold three distinct phase regimes, reminiscent of a frustrated magnet with in-plane (X Y -type) anisotropy.

Publication: Physical Review B Pub Date: March 2022 DOI:

10.1103/PhysRevB.105.104425

Bibcode: 2022PhRvB.105j4425S full text sources APS | 🌓