A Nearly Ideal One-Dimensional S = 5/2 Antiferromagnet FeF₃(4,4′-bpy) (4,4′-bpy =4,4′-bipyridyl) with Strong Intrachain Interactions

Abstract

An ideal one-dimensional (1D) magnet is expected to show exotic quantum phenomena. For compounds with larger S (S = 3/2, 2, 5/2, ...), however, a small interchain interaction J' tends to drive a conventional long-range ordered (LRO) state. Here, a new layered structure of FeF3(4,4'-bpy) (4,4'-bpy = 4,4'-bipyridyl) with novel S = 5/2 (Fe(3+)) chains has been hydrothermally synthesized by using 4,4'-bpy to separate chains. The temperature-dependent susceptibility exhibits a broad maximum at high as 164 K, suggesting a fairly strong Fe-F-Fe intrachain interaction J. However, no anomaly associated with a LRO is seen in both magnetic susceptibility and specific heat even down to 2 K. This indicates an extremely small J' with J'/J < 3.2 × 10(-5), making this new material a nearly ideal 1D antiferromagnet. Mössbauer spectroscopy at 2.7 K reveals a critical slowing down of the 1D fluctuations toward a possible LRO at lower temperatures.

Synthesis and characterization of a new quasi-one-dimensional antiferromagnet CoF2(H2O)2(pyrazine)

“…The inorganic ionic groups such as [ [10][11][12]. Also, the fluorine plays an important role in the regulation of structure, magnetic and optical properties [13][14][15].…”

“…In addition, it is recently reported that the organic molecule could be more efficient to separate spin chains with negligible interchain interaction J΄ for experimentally realizing the nearly ideal 1D S = 5/2 antiferromagnet (4,4΄-bpy)FeF 3 (4,4΄-bpy = 4,4΄-bipyridyl) [15].…”

Synthesis of Sr1+2xLa1‐2xFe1‐xNbxO4 (x=0, 0.1, 0.3, and 0.5) by Sol‐gel Method: Structural, Magnetic, and Dielectric Properties

“…The μ eff of the sample with x = 0i sc lose to the theoreticals pin-only moment of Fe 3 + (5.92 μB) indicating the domination of super-exchange antiferromagnetic interactions (Fe 3 + -O 2À -Fe 3 + ). [23,36] The lower value of μ eff at x = 0.3 could imply the presence of Fe 4 + or Fe 2 + increase as both cations have as maller magnetic moment (4.9 μB). In this work, an increase of Fe 4 + is more reasonable as it is confirmed by absorption spectroscopy measurements.T he change of θ and μ eff value with niobium doping may be attributed to the enhancement of double exchange interactions (Fe 3 + -O 2À -Fe 4 + ).…”

Na6MQ4 (M=Zn, Cd; Q=S, Se): Promising New Ternary Infrared Nonlinear Optical Materials

“…Nonlinear optical (NLO) materials have attracted considerable attention due to their potential application in developing new light sources by frequency‐conversion technology [1–27] . In the UV and visible regions, NLO materials have made significant progress.…”