Possibility of Emergence of Chiral Magnetic Soliton in Hexagonal Metal Formate [NH4][M(HCOO)3] with M2+ = Mn, Fe, Co, and Ni and KCo(HCOO)3

Abstract

Search of chiral magnetic solitons on the basis of the data on the crystal structure is important from both fundamental and technological points of view. Potential chiral magnetic solitons -hexagonal metal formates [NH 4 ][M(HCOO) 3 ] with M 2+ = Mn, Fe, Co, and Ni and KCo(HCOO) 3 containing dominating left-handed chiral antiferromagnetic helices that compete with interhelix interactions have been identified. The sign and strength of magnetic interactions not only between nearest neighbors, but also for longer-range neighbors in the metal formates have been calculated on the basis of structural data. Magnetic structures of these compounds are similar to that of the chiral magnetic soliton Cr 1/3 NbS 2 . The interrelation between chiral polarization of crystalline and magnetic structures in the metastable polymorph KCo(HCOO) 3 has been demonstrated.

Elastic Properties and Energy Dissipation Related to the Disorder-Order Ferroelectric Transition in a Multiferroic Metal-Organic Framework [(CH3)2NH2][Fe(HCOO)3] with a Perovskite-Like Structure

“…Metal-organic frameworks (MOFs) have attracted a lot of attention, and they have potential applications in gas storage, separation, catalysis, photoluminescence, sensors, magnetic and electric devices [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 ]. Multiferroic MOFs have drawn special interest due to tuneable properties and the coexistence of ferroelectricity/ferromagnetism/ferroelasticity [ 9 , 10 , 11 , 12 , 13 , 14 , 15 ]. In [NH 2 NH 3 ][M(HCOO) 3 ] (M = Mn, Fe, Co), electric phase transitions and structural phase transitions occur from non-polar P nma (No.…”

“…In [CH 3 NH 2 NH 2 ][M(HCOO) 3 ] (M = Mn, Fe), second-order structural phase transitions from nonpolar R c to polar R 3c occur at 310 K, and first-order structural phase transitions occur at 180–225 K, and magnetic phase transitions occur at 9–21 K [ 11 ]. In [NH 4 ][M(HCOO) 3 ] (M = Mn, Fe, Co, Ni), electric phase transitions and structural phase transition from non-polar P 6 3 22 to polar P 63 occur at 191–254 K, and magnetic transitions occur at 8.4–29.5 K [ 12 , 13 , 14 , 15 ]. In [(CH 3 ) 2 NH 2 ][M(HCOO) 3 ] (M = Mn, Fe, Co, Ni), electric phase transitions and structural phase transition from rhombohedral R c (No.…”

The materials of ammonium metal formate framework: structures, phase transitions and functionalities

“…表 1 部分手性类钙钛矿AMFF的结构相变和磁相变特征 [25,26,32,46] , 它们是一类低温下的磁电有序共存的材料 和可能的多铁材料. 该系列因其结构的手性而在磁-手 性相关研究中引起关注 [47,48] , 其压致相变和性质也逐 渐被人们注意到 [33,49~53] . [30] (网络版彩图) [32] (网络版彩图) [33,54] (网络版彩图)…”

Elastic Properties and Energy Loss Related to the Disorder–Order Ferroelectric Transitions in Multiferroic Metal–Organic Frameworks [NH4][Mg(HCOO)3] and [(CH3)2NH2][Mg(HCOO)3]

“…In [NH 4 ][M(HCOO) 3 ] (M = Mg, Mn, Fe, Co, Ni, Zn), paraelectric to ferroelectric phase transitions triggered by the disorder-order transitions of the ammonium cations and their displacement within the framework channels occur between 191 K and 255 K (Co: 191 K, Zn: 192 K, Ni: 199 K, Fe: 212 K, Mn: 254 K, Mg: 255 K), accompanied by the structural phase transition from the non-polar hexagonal space group P6 3 22 to the polar hexagonal space group P6 3 [15][16][17][18][19][20][21][22][23][24][25][26][27]. Moreover, in [NH 4 ][M(HCOO) 3 ] (M = Mn, Fe, Co, Ni), spin-canted antiferromagnetic ordering (M = Mn, Co, Ni) or ferromagnetic ordering (M = Fe) occurs between 8 K and 30 K (Mn: 8.4 K, Fe: 9.4 K, Co: 9.8 K, Ni: 29.5 K), indicating the existence of magnetoelectric coupling [20][21][22][23][24][25][26][27]. According to first-principle calculations, it is predicted that magnetism and ferroelectricity also coexist in [NH 4 ][M(HCOO) 3 ] (M = Sc, Ti, V, Cr, Cu) [28].…”