Structural chemistry of superconducting pnictides and pnictide oxides with layered structures

Abstract

Abstract. The basic structural chemistry of superconducting pnictides and pnictide oxides is reviewed. Crystal chemical details of selected compounds and group subgroup schemes are discussed with respect to phase transitions upon charge-density formation, the ordering of vacancies, or the ordered displacements of oxygen atoms. Furthermore, the influences of doping and solid solutions on the valence electron concentration are discussed in order to highlight the structural and electronic flexibility of these materials.

Intra-unit-cell nematic charge order in the titanium-oxypnictide family of superconductors

“…Very recently, superconductivity was discovered [17][18][19] in titanium-oxypnictide compounds, such as ATi 2 Pn 2 O (A ¼ Na 2 , Ba, (SrF) 2 , (SmO) 2 ; Pn ¼ As, Sb, Bi), which are close structural and chemical cousins to the cuprates and iron-pnictides [20][21][22][23][24] . In particular, in isovalent BaTi 2 (Sb 1-x Bi x ) 2 O and aliovalent Ba 1-x Na x Ti 2 Sb 2 O (ref.…”

Magnetic Properties of RE3Pd6Sb5 (RE = Pr, Nd,Gd) and a Group-Subgroup Scheme for Ce3Pd6Sb5 and Yb5Cu11Sn8

“…In continuation of our systematic studies of BaAl 4 -related superstructures [6,10,11] we have extended the investigations on antimonides with the Ce 3 Pd 6 Sb 5 -type structure [7]. Besides the prototype itself, the structures of RE 3 Pd 6 Sb 5 with RE = Pr, Nd, Gd [12] [10].…”

Conventional superconductivity and charge-density-wave ordering in Ba1−xNaxTi2Rohr1, Schilling2, Nesper3 et al. 2013Phys. Rev. B270200View full textAdd to dashboardCite

“…8 The large family of stacked, layered titanium oxide pnictide compounds were long considered as potential host structures for superconductivity. 9 Most of these materials were identified to undergo magnetic or density wave (DW) ordering transitions at low temperatures, in the absence of superconductivity.…”