The atomic structure and carrier concentration at grain boundaries in YBa2Cu3O7–δ

Browning, ND; Chisholm, M. F.; Pennycook, S. J.

doi:10.1017/cbo9780511534829.012

Cited by 2 publications

(9 citation statements)

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“…This result will be discussed in detail further below by comparing the detailed spectra resolved in the different sites. On a similar 2D projection of the Cu L 2,3 edge of both YBCO 6 (Fig. 1d) and YBCO 7 (Fig.…”

Section: Atomicallymentioning

confidence: 82%

“…In YBCO 6 , the Cu L edge spectra in the plane layer (Fig. 2b) has a Lorentzian-like peak (labelled a) consistent with Cu 2 þ (3d 9 ), whereas the spectra in the chain layer is predominantly peaked at 934.…”

Section: Atomicallymentioning

confidence: 95%

“…To reduce the effect of beam exposure (discussed below), the spectra have been selected from the first two unit cells of the spectrum image in the case of YBCO 7 . In YBCO 6 , which is more stable, the signal could be averaged on identical atomic sites over 10 unit cells since no beam exposure dependence was seen. The Cu L 3 and L 2 white lines arise from transitions of 2p 3/2 -3d 3/2 3d 5/2 and 2p 1/2 -3d 3/2 , respectively.…”

Section: Atomicallymentioning

confidence: 99%

“…Although electron energy loss spectroscopy (EELS) [1][2][3][4][5][6] and X-ray absorption spectroscopy (XAS) 2,7-12 of YBCO compounds have been studied over the full range of oxygen stoichiometry, the presence of multiple, distinct copper and oxygen sites (see crystal structure in Fig. 1a), each having different orbital symmetries and doping dependencies, give rise to complex spectra at the Cu L and O K edge.…”

mentioning

confidence: 99%

“…However, the conclusions drawn from these symmetry and doping arguments retain some ambiguity because the different Cu and O sites do not generally have unoccupied states with pure, well-defined symmetries (pure d x2 À y2 versus d y2 À z2 ) that can be neatly resolved as a function of photon polarization. Moreover, due to the strongly correlated nature of the cuprates, standard ab initio theoretical tools such as density functional theory capture some important details of electronic structure but have proven 526 528 530 532 534 536 538 540 542 544 948 936 934 932 930 928 950 952 954 956 958 6 at the Cu L edge and (e) YBCO 7 at the Cu L edge. These spectra are integrated over the (ab) atomic planes but spatially resolved along the c axis.…”

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confidence: 99%

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Atomic scale real-space mapping of holes in YBa2Cu3O6+δ

et al. 2014

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The high-temperature superconductor YBa 2 Cu 3 O 6 þ d consists of two main structural units-a bilayer of CuO 2 planes that are central to superconductivity and a CuO 2 þ d chain layer. Although the functional role of the planes and chains has long been established, most probes integrate over both, which makes it difficult to distinguish the contribution of each. Here we use electron energy loss spectroscopy to directly resolve the plane and chain contributions to the electronic structure in YBa 2 Cu 3 O 6 and YBa 2 Cu 3 O 7 . We directly probe the charge transfer of holes from the chains to the planes as a function of oxygen content, and show that the change in orbital occupation of Cu is large in the chain layer but modest in CuO 2 planes, with holes in the planes doped primarily into the O 2p states. These results provide direct insight into the local electronic structure and charge transfers in this important high-temperature superconductor.

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Section: Atomicallymentioning

confidence: 82%

Section: Atomicallymentioning

confidence: 95%

Section: Atomicallymentioning

confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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Atomic scale real-space mapping of holes in YBa2Cu3O6+δ

et al. 2014

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Irreversible properties of YBCO thick films deposited by liquid phase epitaxy on single crystalline substrates

Vostner¹,

Tönies²,

Weber³

et al. 2003

Supercond. Sci. Technol.

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We report on the field and temperature dependence of the critical transport current density J c , the angular dependence of the transport current at various external magnetic fields and the irreversibility fields in YBa 2 Cu 3 O 7−δ (Y-123) thick films prepared by liquid phase epitaxy (LPE). A comparison of the irreversible properties between specimens produced with and without silver additions to the melt is also presented. Transmission electron microscopy (TEM) was employed to obtain information on the correlation between the transport properties and the microstructure. The samples were deposited either directly on NdGaO 3 (NGO) or on seeded (100) MgO substrates, where a 200 nm thin YBCO film deposited by pulsed laser deposition (PLD) acts as seed layer for the LPE process. The final thickness of the Y-123 layer is of the order of 1 µm for the NGO and between 2 and 10 µm for the MgO samples. The critical current densities reach 3 × 10 9 A m −2 at zero field and 77 K in the best case.

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The atomic structure and carrier concentration at grain boundaries in YBa₂Cu₃O_7–δ

Cited by 2 publications

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Atomic scale real-space mapping of holes in YBa2Cu3O6+δ

Atomic scale real-space mapping of holes in YBa2Cu3O6+δ

Irreversible properties of YBCO thick films deposited by liquid phase epitaxy on single crystalline substrates

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