Structural and electrical properties under high pressure for the superconducting spin-ladder systemSr0.4Ca13.6

Temperature and composition phase diagram in the iron-based ladder compoundsBa1−xCsxFe2Se3

“…Note that magnetic structures obtained by our study are realized in the realistic ratio J H /U = 0. 25 [42][43][44] . This compound has Cu 2 O 3 combined two-leg-ladder structure, and is insulator.…”

Hole distribution in(Sr,Ca,Y,La)14CuNücker1, Merz2, Kuntscher3 et al. 2000Phys. Rev. B115171072View full textAdd to dashboardCite

“…Chemical pressure by Ca substitution for Sr as well as physical pressure reduces the interlayer distances 19 and increases the twisting of the CuO 2 chain. 20 As a consequence, about 30-50 % of the O(c) atoms reduce their distance to the nearest Cu(l) atom to a value comparable with the typical Cu-O apex distance for HTSC's. 20 A transfer of holes from the chains to the ladder sites concurrent with Ca substitution was predicted theoretically 21 and was also inferred from various experiments.…”

“…20 As a consequence, about 30-50 % of the O(c) atoms reduce their distance to the nearest Cu(l) atom to a value comparable with the typical Cu-O apex distance for HTSC's. 20 A transfer of holes from the chains to the ladder sites concurrent with Ca substitution was predicted theoretically 21 and was also inferred from various experiments. 11,12,22 Despite all this wealth of information on the ladder compounds, however, there remains a considerable amount of controversy, and a more direct determination of the sitespecific hole distribution is still missing.…”

Charge-density wave formation inSr14−xCaxCuGorshunov1, Haas2, Rõõm3 et al. 2002Phys. Rev. B496430View full textAdd to dashboardCite

“…(e) The resonance at 12 cm −1 is characterized by an enhanced effective mass, typical for collective excitations like the CDW. (f) We do not observe any resonance for x = 9 when the system looses its one-dimensionality [23,24]. 21].…”

“…A number of magnetic, electronic and structural properties display an anomaly around 170 K [4,24,[28][29][30] which may indicate some type of phase transition. We suggest that this transition is due to a second CDW which develops in the chain sub-system of Sr 14 Cu 24 O 41 .…”