High-pressure synthesis, structure and properties of new ternary pnictides La3TiX5 (X = P, As)

High-pressure synthesis, crystal structure, and properties of iron-based spin-chain compound Ba9Fe3Se15

“…Compared with its sister compounds Ba 9 Fe 3 Te 15 , the band gap of Ba 9 Fe 3 Se 15 is enhanced when the anions of Te are replaced by smaller ion size of Se. This is a typical phenomenon observed in the system with quasi 1D conducting chains, where the electron hopping among the chains determines the transport property [23,24]. Since the Se-4p electrons are more localized than Te-5p ones, the replacement of Te by smaller size of Se should reduce the electron hopping between FeX 6 chains and result in an increase of the band gap.…”

Doping effect on the structure and physical properties of quasi-one-dimensional compounds Ba9Co3(Se1 – x S x )15 (x = 0 – 0.2)*

“…Indeed, the increase of band gap in Ba 9 Co 3 (Se 1−x S x ) 15 as the substitution of Se by S is a typical phenomenon observed in the quasi-one-dimensional conducting chain system, where the transport properties depend on the strength of the electron hopping between the chains. [23,24] Since the S-3p electrons are more localized than Se-4p ones, the replacement of Se by smaller size S should reduce the electron hopping between CoSe/S 6 chains and give rise to an increase of the band gap. Therefore, although the interchain distance of Co decreases as the substitution of S into Se sites, the 1D conducting characteristic of Ba 9 Co 3 (Se 1−x S x ) 15 becomes stronger.…”

Synthesis, structure, and magnetism in the ferromagnet La3MnAs5 : Well-separated spin chains coupled via itinerant electrons

“…To tailor the three-dimensional (3D) magnetism of quasi-1D spin chains, monatomic transition-metal oxide chains have been reported to be deposited on the surface of nonmagnetic metals Ir and Pt, and the spin chains are found to be coupled via the interaction exchange with itinerant electrons, the so-called Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction, to form chiral spin order [5,6]. Besides the artificial spin chains coupled via RKKY interaction, the filled anti-Mn 3 Si 5 type ternary compounds A 3 MX 5 (A = Ba or La; M = transition metal; X = chalcogen or pnictogen) provide a unique opportunity to explore the magnetism of 1D spin chains in bulk materials [7][8][9][10][11][12][13][14][15][16][17]. A 3 MX 5 consists of facesharing MX 6 octahedral chains along the c axis, which are arranged with a triangular configuration in the ab plane and separated by A and X ions with a significant large distance of ∼9 Å, presenting strongly 1D structure character.…”

“…For example, the trimerized Ba 9 V 3 Se 15 featured with 1D ferromagneticlike spin chain has been reported to undergo a LRSO transition at 2.5 K [13]. On the contrary, all the reported La 3 MX 5 compounds are metallic because the contribution of La 3+ to the density of states (DOS) at the Fermi level cannot be ignored [7,9,[18][19][20]. The conducting MX 6 chains are bridged by La 3+ to form a 3D metal, which should greatly enhance the interchain electron hopping and thus the interchain spin coupling.…”