A magnetic study of the one dimensional Sr $\mathsf{_{3}}$ NiIrO $\mathsf{_{6}}$ compound

Abstract

The magnetic properties of a polycrystalline Sr3NiIrO6 sample have been investigated by means of susceptibility and magnetization measurements. On the one hand, it is found that this compound, made of magnetic chains on a triangular lattice, behaves very similarly to Ca3CoRhO6 and Ca3CoIrO6. In particular, at low temperature (T<T2 (= 21 K)), a frozen state, characterized by a very slow spin dynamic, is evidenced. On the other hand, for T2 <T <T1 (=70 K), this phase exhibits magnetization values, smaller than the expected ones, with a 1/3 plateau reminiscent of the ferrimagnetic state of Ising spins on a triangular lattice. Nonetheless, the absence of saturation in 35 T and the low magnetization values are consistent with an antiferromagnetic intrachain coupling between Ir 4+ (S =1/2) and Ni 2+ (S =1).Sr3NiIrO6 can be viewed as made of antiferromagnetically coupled ferrimagnetic chains on a triangular lattice. On the basis of these results, a magnetic (H, T ) phase diagram is proposed.

Magnetic properties ofSr3NiIrO6andSr3CoIrO6: Magnetic hysteresis with coercive fields of up to 55 T

“…III B. At this point, we note that a coercive field μ 0 H c ≈ 22 T was measured by another group in polycrystalline samples of Sr 3 NiIrO 6 at T = 15 K [17]. This is similar to the values observed in our single-crystal samples at 15 K [see Fig.…”

“…III B below, the samples used in the current study behave in a very similar way.) However, no heat capacity signature of the magnetic ordering has been observed in either Sr 3 NiIrO 6 or Sr 3 CoIrO 6 , suggesting a gradual onset of partially disordered magnetism [16,17]. Moreover, no structural change was seen at either T 1 or T 2 [13,15].…”

“…Magnetic frustration is intrinsic to such a structure, and can result from antiferromagnetic interactions within the triangular lattice in the ab plane, and from frustration between nearest-neighbor and next-nearest-neighbor interactions along the c-axis chains [11,14,[19][20][21]. Experimentally, this is manifested in the complex behavior of the magnetic susceptibilities of Sr 3 CoIrO 6 [15,16] and Sr 3 NiIrO 6 [13,[15][16][17] and their structurally similar relatives Ca 3 CoRhO 6 [22] and Sr 3 NiRhO 6 [23]; below a temperature conventionally [15] labeled T 1 , the susceptibility rises strongly; at a temperature T 2 , a factor ≈3-5 lower than T 1 , the spin dynamics are frozen in, and slow relaxation of magnetic properties [17] is observed. (As will be shown in Sec.…”

Magnetic order in the frustrated Ising-like chain compoundSr3NiIrO6

“…3, are consistent with an easy axis of anisotropy along c. A non linearity of the magnetization isotherm manifests itself at 15 K for H c. At 5 T under these conditions, the magnetization reaches a value of 0.25 µ B /f.u. This announces a step in the magnetization process which was observed by Flahaut et al in high field magnetization measurements 9 . In Co compounds with ferromagnetic intrachain interactions, this magnetization step corresponds to 1/3 of the saturated magnetization 15,16 .…”

Magnetic properties and crystal structure of Sr3CoIrO6and Sr3NiIrOMikhailova1, Schwarz2, Senyshyn3 et al. 2012Phys. Rev. B

“…Below T 2 , the temperature of spin freezing at magnetic fields lower than 1 T, a frozen PDA state (F-PDA) with very slow dynamics of spins was discussed: T 2 ∼ 30 K for Ca 3 3,12 which are accompanied by the parallel orientation of spins inside individual domains and the movement of domain walls within the material. In a constant external magnetic field this domain switching is thermally activated and can be studied by measuring the magnetization as a function of time at temperatures close to T 2 .…”