A note on the symmetry and Bi valence of the superconductor Bi2Sr2Ca1Cu2O8

Bordet, Pierre; Capponi, J.J.; Chaillout, C.; Chenávas, J.; Hewat, A.W.; Hewat, E.A.; Hodeau, J.L.; Marezio, M.; Tholence, J.L.; Tranqui, D.

doi:10.1016/0921-4534(88)90126-8

Cited by 158 publications

(27 citation statements)

References 10 publications

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“…Several authors describe the average structure of the Bi2212 structure at room temperature in space group Bbmb (or Amaa, or standard setting Cccm) [15,16]. But other authors claim that better agreement is obtained in space group Bb2b (or A2aa or Ccc2) [17,18]. The corresponding point group is mmm for the former and m2m for the latter.…”

Section: Resultsmentioning

confidence: 95%

High-resolution electron microscopy and low-temperature electron diffraction studies of a Bi2212 single crystal grown by the floating zone method

Sun¹,

Kimoto²,

Mochiku³

1997

J Supercond

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High-resolution electron microscopy of a Bi2Sr2CaCu208 (Bi2212) single crystal prepared by the floating zone method shows that the single crystal is of high quality; there is no intergrowth faulting in the layered structure along the c-axis. Low-temperature selected area diffraction and convergent beam electron diffraction (CBED) studies of this high-quality single crystal show that there is no detectable change for both the point group symmetry of the basic structure and the modulated structure from room temperature to about 15 K. However, a lattice anomaly around 215 K was suggested by measuring the temperature dependence of the ratio between the cross-point distances of the HOLZ lines in high-index CBED patterns. The presence of the lattice anomaly was further confirmed by low-temperature X-ray diffraction.KEY WORDS: Single crystal of Bi2Sr2CaCu208; high-resolution electron microscopy; low-temperature electron diffraction; lattice anomaly.

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Section: Resultsmentioning

confidence: 95%

High-resolution electron microscopy and low-temperature electron diffraction studies of a Bi2212 single crystal grown by the floating zone method

Sun¹,

Kimoto²,

Mochiku³

1997

J Supercond

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“…[17][18][19] The effective interlayer space for HTSC thus analyzed is ϳ͑8.6/2͒ Å for YBCO-1237, 20 ϳ7.8 Å for ''0212-Cl'' ͑calculated from the data in Table I͒, ϳ9.5 Å for Hg-1212, 21 and ϳ12 Å for Bi-2212. 22 Focusing on the off-plane constructions, ''0212-Cl'' is composed of oxyhalide and rock-salt ͑RS͒ type ͑Sr,Ca͒͑Cl,O͒/͑Sr,Ca͒͑Cl,O͒ sheets, while YBCO-1237, Bi-2212, and Hg-1212 are all of oxides, but with perovskite-type BaO/͓CuO 2Ϫ␦ ͔/BaO, RS-type SrO/BiO/BiO/SrO, and RS-type BaO/HgO 1Ϫ␦ /BaO sheets, respectively. Therefore it suggests that the thickness instead of the composition of the off-plane block plays a dominant role in the interlayer coupling and consequently the flux dynamics to the HTSC.…”

Section: Resultsmentioning

confidence: 99%

High-pressure synthesis and superconducting properties of the oxychloride superconductor(Sr,Ca)3
Jin
¹
,
Puźniak
²
,
Zhao
³

et al. 2000
Phys. Rev. B
38
0
5
0
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Chlorine-containing (Sr,Ca͒ 3 Cu 2 O 4ϩ␦ Cl 2Ϫy superconductors have been synthesized at 5.0 GPa and ϳ1000°C. The double-͓CuO 2 ͔ layered compound crystallizes into (La,Sr͒ 2 CaCu 2 O 6 structure with Cl residing at the apical anion site relative to the ͓CuO 2 ͔ plane. The critical transition temperature T c 80 K has been achieved in these superconductors. The Sr 2.3 Ca 0.7 Cu 2 O 4ϩ␦ Cl 1.3 superconductor was studied in terms of irreversibility field H irr and intragrain critical current density I c . It is found that the irreversibility field of the superconductor can be described by the power law dependence (1ϪT/T c ) n , with nϳ2. The reduced H irr (T/T c ) line is positioned between those of YBa 2 Cu 3 O 7 and Bi 2 Sr 2 CaCu 2 O 8 in the H-T plane, close to HgBa 2 CaCu 2 O 6ϩ␦ . The critical current density J c (T) was extracted from the Bean critical-state model and showed a smooth temperature dependence. No significant difference was found for the general behavior of H irr (T) and J c (T) of (Sr,Ca͒ 3 Cu 2 O 4ϩ␦ Cl 2Ϫy from those of oxide high-T c superconducting cuprates ͑HTSC͒. The off-plane space remains the important parameter to evaluate interlayer coupling of the oxyhalide HTSC, which is consistent with oxide HTSC. The results suggest the potential application capability of the oxyhalide superconductors even though the off-plane block is composed of oxyhalide instead of the routine oxides.

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“…These early reports have been falsified by many experiments which have shown on the contrary that the macroscopic quantum coherence giving 90K superconductivity in Bi2212 emerges in a very complex disordered inhomogeneous phase from atomic scale to micron scale which it an hot topic today after 30 years of research in this field. The refinements of the crystal structure by electron, x-ray and neutron diffraction [4][5][6][7][8][9][10][11][12] and resonant x-ray scattering at the Cu K-edge [13] revealed a monoclinic structure and an incommensurate modulation along the long b axis with period l/b ~ 4.7 as shown in Fig. 1.…”

Section: Introductionmentioning

confidence: 94%

“…Two different space groups for the average structures of Bi2212 have been proposed in the literature: first, noncentrosymmetric Bb2b or A2aa space group [5,6] and second, centrosymmetric Bbmb space group [7][8][9][10][11][12][13] proposed by teams neglecting the weak reflections probing the non-centric orthorhombic cell, which permits the oxygen in the BiO plane to move off the center of the Bi square approaching within 2.2 Å a pair of Bi atoms [5.6]. The Cu edge resonant elastic x-ray scattering [13] has shown that the Cu plane follows large amplitude incommensurate displacements with different modulations of the Cu and planar oxygen atoms.…”

Section: Introductionmentioning

confidence: 99%

Local Noncentrosymmetric Structure of Bi2Sr2CaCu2O8+y by X-ray Magnetic Circular Dichroism at Cu K-Edge XANES

Иванов

Ivanov

Менушенков

et al. 2017

J Supercond Nov Magn

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The two-dimensional Bi 2 Sr 2 CaCu 2 O 8+y (Bi2212), the most studied prototype cuprate superconductor, is a lamellar system made of a stack of two-dimensional corrugated CuO 2 bilayers separated by Bi 2 O 2+y Sr 2 O 2 layers. While the large majority of theories, proposed to interpret unconventional high T c superconductivity in Bi 2 Sr 2 CaCu 2 O 8+y, assume a centrosymmetric tetragonal CuO 2 lattice for the [CuO 2 ]Ca[CuO 2 ] bilayer here we report new compelling results providing evidence for local non-centrosymmetric symmetry at the Cu atom. We have measured polarized Cu K-edge XANES (x-ray absorption near edge structure) and the K-edge X-ray magnetic circular dichroism (XMCD) of a Bi2212 single crystal near optimum doping. The Cu K edge XMCD signal was measured at ID12 beamline of ESRF with the k-vector of x-ray beam parallel to c-axis i.e. with the electric field of x-ray beam E//ab, using a 17 T magnetic field parallel to the c-axis of a Bi2212 single crystal. Numerical simulations of the XMCD signal of Bi2212 by multiple scattering theory have shown agreement with the experimental XMCD signal only for the local structure with non-centrosymmetric Bb2b space group of Bi 2 Sr 2 CaCu 2 O 8+y . Ivanov, A. A., et a. Local noncentrosymmetric structure of Bi2Sr2CaCu2O8+y …

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A note on the symmetry and Bi valence of the superconductor Bi2Sr2Ca1Cu2O8

Cited by 158 publications

References 10 publications

High-resolution electron microscopy and low-temperature electron diffraction studies of a Bi2212 single crystal grown by the floating zone method

High-resolution electron microscopy and low-temperature electron diffraction studies of a Bi2212 single crystal grown by the floating zone method

High-pressure synthesis and superconducting properties of the oxychloride superconductor(Sr,Ca)3
Jin
¹
,
Puźniak
²
,
Zhao
³

et al. 2000
Phys. Rev. B
38
0
5
0
View full text Add to dashboard Cite

Local Noncentrosymmetric Structure of Bi2Sr2CaCu2O8+y by X-ray Magnetic Circular Dichroism at Cu K-Edge XANES

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A note on the symmetry and Bi valence of the superconductor Bi2Sr2Ca1Cu2O8

Cited by 158 publications

References 10 publications

High-resolution electron microscopy and low-temperature electron diffraction studies of a Bi2212 single crystal grown by the floating zone method

High-resolution electron microscopy and low-temperature electron diffraction studies of a Bi2212 single crystal grown by the floating zone method

High-pressure synthesis and superconducting properties of the oxychloride superconductor(Sr,Ca)3Jin1, Puźniak2, Zhao3 et al. 2000Phys. Rev. B38050View full textAdd to dashboardCite

Local Noncentrosymmetric Structure of Bi2Sr2CaCu2O8+y by X-ray Magnetic Circular Dichroism at Cu K-Edge XANES

Contact Info

Product

Resources

About

High-pressure synthesis and superconducting properties of the oxychloride superconductor(Sr,Ca)3
Jin
¹
,
Puźniak
²
,
Zhao
³

et al. 2000
Phys. Rev. B
38
0
5
0
View full text Add to dashboard Cite