Peculiarities of magnetic ordering in the S = 5/2 two-dimensional square-lattice antimonate NaMnSbO4

TL;DR

This study investigates the magnetic properties of NaMnSbO4, revealing long-range antiferromagnetic order at 44 K, a short-range order at 55 K, and a likely canted antiferromagnetic ground state through various experimental and computational methods.

Contribution

It provides a comprehensive analysis of the magnetic ordering in NaMnSbO4, combining experimental data with density functional calculations to elucidate its magnetic behavior.

Findings

Long-range magnetic order established at 44 K

Short-range magnetic correlations observed at 55 K

Ground state likely canted antiferromagnetic

Abstract

An orthorhombic compound, NaMnSbO4, represents a square net of magnetic Mn2+ ions residing in vertex-shared oxygen octahedra. Its static and dynamic magnetic properties were studied using magnetic susceptibility, specific heat, magnetization, electron spin resonance (ESR), nuclear magnetic resonance (NMR) and density functional calculations. Thermodynamic data indicate an establishment of the long-range magnetic order with TN about 44 K, which is preceded by a short-range one at about 55 K. In addition, a non-trivial wasp-waisted hysteresis loop of the magnetization was observed, indicating that the ground state is most probably canted antiferromagnetic. Temperature dependence of the magnetic susceptibility is described reasonably well in the framework of 2D square lattice model with the main exchange parameter J = -5.3 K, which is in good agreement with density functional analysis, NMR and ESR data.