New family of superconducting copper oxides

Ehmann, A.; Kemmler‐Sack, S.; Lösch, S.; Schlichenmaier, Martin; Wischert, W.; Zoller, P.; Nissel, T.; Huebener, R. P.

doi:10.1016/0921-4534(92)90257-d

Cited by 61 publications

(12 citation statements)

References 7 publications

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“…The cell parameters a and c for samples A and B are in reasonable agreement with the values reported for the same composition (Bio.sCuo.s) Sr2Yo.sCuz20~7 by Ehmann et al [14]. The slight contraction observed in the parameter a after quenching is in agreement with a similar observation made for Pb-containing (Pb, Cu)-1212 samples [4,23], and essentially results from the shortening of the Cu(2)-O(1) bond (Table II).…”

Section: Resultssupporting

confidence: 87%

“…Unlike the full occupancy at Bi sites exhibited by the bismuth double-layer compounds BiaSr2Ca~-lCu~O2,+4, the (Bi, Cu)-1212 phase has been reported to exhibit low occupancy factors, viz. 0.44 and 0.30 for Bi and Cu sites, respectively, within the (Bi, Cu)-O monolayer [14,30]. In fact, the occupancy is as low as 0.3 and 0.2 for Bi and Cu in the monolayer cuprate (Bi, Cu)Sr2LnCeCu209 a [31].…”

Section: Resultsmentioning

confidence: 95%

“…In particular, superconductivity at 68 K has been attained for (Bio~sCuo.5)Sr2Y0.sCuz206.95 [14]; at 26 K for (Bio.27Cdo.73)Sr2(Yo.7Ca0.3)Cu2Oz [17] ; and at 51 K for (B0.sCuo.s)(Sro.sBal.2)YCu207 [ 181.…”

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confidence: 99%

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Neutron structural study of the Bi-monolayer compound (Bi0.5Cu0.5)Sr2(Y0.8Cu0.2)Cu2O7 + ??the Role of excess oxygen in superconductivity

et al. 1994

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Comparative neutron structural investigations are made on nonsuperconducting (slow-cooled) and superconducting (liquid-nitrogen quenched; Tc ~ 70 K and R = 0 at 20 K) samples of (Bio.sCu0,5)Sr2(Y08Cu0.2)Cu207 + ~ in order to examine the role of excess oxygen on the superconducting behavior of this "1212"-phase compound. Analysis of refined structural parameters shows that the two main factors which influence the superconductivity in (Bi, Cu)-1212 are: (i) the extent of occupancy of excess oxygen at 0(5), the 2(e) site located in between the two CuO2 pyramidal layers, and (ii) the length of the apical Cu (2)

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 95%

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Neutron structural study of the Bi-monolayer compound (Bi0.5Cu0.5)Sr2(Y0.8Cu0.2)Cu2O7 + ??the Role of excess oxygen in superconductivity

et al. 1994

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“…Observation of superconductivity at critical temperature (T c ) of 68 K in a Ca-free sample with a nominal composition of (Bi 0.5 Cu 0.5 )Sr 2 Y 0.8 Cu 2.2 O z has been reported for the first time by Ehmann et al [1]. They suggested that the real chemical composition of this compound was (Bi,Cu)Sr 2 (Y,Ca)Cu 2 O z and that its idealized crystallographic structure was so-called "1-2-1-2" type characteristically containing (Bi,Cu)O monolayer.…”

Section: Introductionmentioning

confidence: 99%

“…They suggested that the real chemical composition of this compound was (Bi,Cu)Sr 2 (Y,Ca)Cu 2 O z and that its idealized crystallographic structure was so-called "1-2-1-2" type characteristically containing (Bi,Cu)O monolayer. It was likely that this compound had a tetragonal unit cell with a space group of P4/mmm having lattice parameters of a≈0.38 nm and c≈1.17 nm [1,2]. Real …”

Section: Introductionmentioning

confidence: 99%