Hole distribution in(Sr,Ca,Y,La)14Cu

Abstract

Hole distribution for (Sr,Ca,Y,La)14Cu24O41 ladder compounds studied by x-ray absorption spectroscopy Nücker, N.; Merz, M.; Kuntscher, C.A.; Gerhold, S.; Schuppler, S.; Neudert, R.; Golden, M.S.; Fink, J.; Schild, D.

Theory ofL-edge resonant inelastic x-ray scattering for magnetic excitations in two-leg spin ladders

“…32,33 The x and y axes are defined along the Cu-O bonds parallel to the crystallographic c and a axes, respectively, while the z along the b axis. Here, the a and c axes are along the rung and leg directions of the ladders.…”

Magnetization of hole-dopedCuO2spin chains inSr14−xKlingeler1, Tristan2, Büchner3 et al. 2005Phys. Rev. BSelf Cite154121View full textAdd to dashboardCite

“…4,5,13 In our study, we concentrate on the effect of Ca-doping on the low temperature magnetic susceptibility. We note, that the magnetic properties have been studied previously by investigating the temperature dependence of the magnetisation of polycrystals at B = 1 T. 23 These data of Sr 14−x Ca x Cu 24 O 41 , with 0 ≤ x ≤ 10, have been analysed in terms of the free dimer model.…”

“…In particular, the structural distortions favour the formation of dimers in Substitution of Ca 2+ for Sr 2+ leads to a partial charge transfer into the ladder subsystem owing to chemical pressure. 13,17 Upon Ca doping, the charge order is suppressed 4-6 and the dimer state becomes unstable 14,15 . For Sr 14−x Ca x Cu 24 O 41 , with x ≥ 11, long range antiferromagnetic order is found at low temperatures (< 2.5 K).…”

“…Similar to the high-T C cuprates, the holes are expected to be mainly of O:2p character and to form Zhang-Rice singlets. 12,13 In Sr 14 Cu 24 O 41 , the holes are mainly located in the chains. 13 The magnetic coupling of next nearest neighbour Cu-spins via a hole is antiferromagnetic.…”

“…12,13 In Sr 14 Cu 24 O 41 , the holes are mainly located in the chains. 13 The magnetic coupling of next nearest neighbour Cu-spins via a hole is antiferromagnetic. Below T ≈ 240 K, charge ordering is observed 3,5 and a dimerized ground state with a spin excitation gap ∆ ≈ 130 K develops.…”