Magnetism and ESR of the Seff=12 antiferromagnet BaCo2(SeO3)

Magnetic Properties and Phase Diagram of the Honeycomb Layered Na2Ni2TeO6 Single Crystal under a High Magnetic Field

“…The negative θ indicates that the dominant magnetic exchange is AFM in Na 2 Ni 2 TeO 6 , and the difference in Curie−Weiss temperature and effective magnetic moment between B∥c and B⊥c may be caused by the magnetiocrystalline anisotropy of Na 2 Ni 2 TeO 6 ; similar behavior is observed in the other antiferromagnet material BaCo 2 (SeO 3 ) 3 •3H 2 O. 29 The insets in Figure 2a,b show the curves of temperature dependence of the dχ/dT enlarged region from 2 to 50 K, from which obvious phase transitions are observed at T ∥ N and T ⊥ N . Figure 3 shows the temperature dependence of susceptibility (χ) with different magnetic fields, which reveal the influence of magnetic field on AFM phase transition both in zero field cooling (ZFC) and field cooling (FC) branches.…”

K2Ni(SeO3)2: A Perfect S = 1 Triangular-Lattice Antiferromagnet with Strong Geometric Frustration and Easy-Plane Anisotropy

“…At low field, the FC and ZFC curves coincide well in the high temperature region, while at low temperature, a thermal hysteresis between the FC and ZFC curves can be clearly seen near 3 K. As the magnetic field increases, the thermal hysteresis is suppressed gradually, and T N moves to the lower temperature, which is a typical characteristic of a classical antiferromagnet. 25 A scrutiny of the ZFC χ(T) curves reveals that in addition to the anomaly at T N shifting to low temperature, there appears a hump above T N , which is more pronounced with the increase of magnetic field. This feature means that in higher field, the system successively undergoes a magnetic transition from the paramagnetic state to the UUD state and a transition from the UUD state to the AFM state with a 120°spin configuration, showing the Heisenberg character of K 2 Ni(SeO 3 ) 2 .…”