“CaCu2O3”—a nonstoichiometric compound: structural disorder and magnetic properties

Effect of Zn doping on crystal growth and structure of the pseudo-ladder compound CaCu2O3

“…1b). This causes a change from spin gap behavior (for SrCu 2 O 3 ) to a long-range antiferromagnetic ordering at 27 K (for CaCu 2 O 3 ) [4]. Additionally, at variance with the normal ladder picture, an unusually large number of holes are distributed in orbitals parallel to the interlayer direction [5].…”

“…It is known that the actual composition in CaCu 2 O 3 is ''Ca'' deficient with a balancing excess in ''Cu'', and an oxygen deficiency corresponding to the formula Ca 0.86 Cu 2.14 O 2.93 [4]. Thus, the CaCu 2 O 3 is also referred to as Ca 3 Cu 7 O 10 [6].…”

Single-crystal growth of pure and Zn-doped CaCu2O3 by TSFZ method

“…The crystal structure of CaCu 2 O 3 belongs to the orthorhombic space group Pmmn with lattice constants a ¼ 9. 946 [3], in contrast to the spin gap behavior for SrCu 2 O 3 [1], is related to the structural difference. So far, only a few studies have been carried out for CaCu 2 O 3 ; particularly there are no reports on chemical doping at Cu-site.…”

“…These ions are monovalent, which contributes to the formation of the target phase ''Ca 0.86 Cu 2.14 O 3Àd '' containing Cu 1+ ions. It is known that the Cu-ions which replace the Ca-ions are in Cu 1+ -state [3]. On the other hand, the nonavailability of sufficient Cu 2+ ions in the melt suppresses the formation of secondary phase Ca 2 CuO 3 [6].…”

“…Contrary to this, the compound CaCu 2 O 3 , chemical analogue of SrCu 2 O 3 , consists of an array of linear Cu-O-Cu legs coupled through buckled Cu-O-Cu rungs (1231) to form ladders [2]. Furthermore, the actual chemical composition of ''CaCu 2 O 3 '' is known to be Ca deficient with an equal amount of excess Cu-ion occupying the Ca-site according to the chemical formula Ca 0.86 Cu 2.14 O 3Àd [3]. Here, for the simplicity of the denotation, we use the idealized chemical formula ''CaCu 2 O 3 ''.…”