HREM study of the YBCO/MgO interface on an atomic scale

Træholt, Chresten; Wen, Jianguo; Svetchnikov, V. L.; Zandbergen, H.W.

doi:10.1016/0921-4534(94)90843-5

Cited by 20 publications

(5 citation statements)

References 18 publications

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“…The CuO plane, proposed by Basu et al [28] and suggested later by Ramesh [16], is identified as the film starting layer on the LAO. Our observations of the locally disordered CuO-MgO contact at the YBCO/MgO and the transitional phase on the YSZ agree well with the previous HRTEM studies [26,29]. However, it is not yet clear why different stacking sequences were observed in the different heterogeneous systems, even though the same deposition conditions and even the same deposition runs were adopted for this study.…”

Section: Atomic Interface Contacts In Different Ybco/substrate Systemssupporting

confidence: 90%

“…Additionally, the YBCO layers (not just the first monolayer but also the following ones) were found buckled at the steps of the MgO surface (marked by a dotted line in figure 6(a)). A similar phenomenon was also observed by Traeholt et al [29]. It suggests that the YBCO film lattice has already nearly fully relaxed by the defective interface and therefore can grow conformably on the surface defects.…”

Section: Heterointerface Mismatching and Strain Relaxationsupporting

confidence: 83%

“…The formation of the anti-phase boundary (APB) was reported as an effective mechanism for strain relaxation in the YBCO film grown on STO [29]. However, there is no APB found in the YBCO on the STO or on the LAO in this study (see figure S1 of supplemental information available at stacks.iop.org/SUST/26/025009/mmedia).…”

Section: Heterointerface Mismatching and Strain Relaxationmentioning

confidence: 62%

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Atomic interface sequence, misfit strain relaxation and intrinsic flux-pinning defects in different YBa₂Cu₃O_7−δheterogeneous systems

Zhu

Tsai

Wang

2012

Supercond. Sci. Technol.

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To explore the interface effects on enhancing critical current density in YBa 2 Cu 3 O 7−δ (YBCO) thin films, four heterogeneous systems, of which two have small opposite lattice misfits (i.e., the YBCO/STO (∼1.6%) and the YBCO/LAO (∼−1.6%)), and the other two have relatively large opposite mismatch (i.e., the YBCO/MgO (∼8.9%) and the YBCO/YSZ (∼−5.9%)), were selected and synthesized by pulsed-laser deposition. A detailed microstructure analysis including XRD, TEM and the state-of-the-art Cs-corrected STEM imaging, and a thorough superconducting property characterization including critical transition temperature (T c ) and critical current density (J self-field c and J in-field c (H c) at various temperatures), were conducted for all four heterogeneous systems. The results reveal that the YBCO intrinsic defects, driven by the interface mismatch of different strain states, present a diverse nature in their distribution and density, and thus different flux-pinning performances under various measurement conditions. This study provides an in-depth insight into the microstructure-property correlation in a strongly correlated electronic system, the YBCO heterogeneous structures.

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Section: Atomic Interface Contacts In Different Ybco/substrate Systemssupporting

confidence: 90%

Section: Heterointerface Mismatching and Strain Relaxationsupporting

confidence: 83%

Section: Heterointerface Mismatching and Strain Relaxationmentioning

confidence: 62%

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Atomic interface sequence, misfit strain relaxation and intrinsic flux-pinning defects in different YBa₂Cu₃O_7−δheterogeneous systems

Zhu

Tsai

Wang

2012

Supercond. Sci. Technol.

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“…That such grains do provide enhanced properties has been demonstrated by Eickemeyer et al [16]. Interestingly it should be noted that bi-crystal boundaries do meander on length scales of a few hundred nm [92,93,39]. Gray et al [94] noted that atomically flat bulk bi-crystal boundaries exhibit a depressed critical current when compared to equivalent misorientation angles in meandered boundaries in thin film bi-crystals.…”

Section: Single Grain Boundaries Isolated Within Coated Conductorsmentioning

confidence: 97%

Importance of low-angle grain boundaries in YBa₂Cu₃O_7−δcoated conductors

Durrell¹,

Rutter²

2008

Supercond. Sci. Technol.

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Abstract. Over the past ten years the perception of grain boundaries in YBa 2 Cu 3 O 7−δ conductors has changed greatly. They are no longer a problem to be eliminated but an inevitable and potentially favourable part of the material. This change has arisen as a consequence of new manufacturing techniques which result in excellent grain alignment, reducing the spread of grain boundary misorientation angles. At the same time there is considerable recent evidence which indicates that the variation of properties of grain boundaries with mismatch angle is more complex than a simple exponential decrease in critical current. This is due to the fact that low-angle grain boundaries represent a qualitatively different system to high angle boundaries. The time is therefore right for a targetted review of research into low-angle YBa 2 Cu 3 O 7−δ grain boundaries. This article does not purport to be a comprehensive review of the physics of grain boundaries as found in YBa 2 Cu 3 O 7−δ in general; for a broader overview we would recommend that the reader consult the comprehensive review of Hilgenkamp and Mannhart (Rev. Mod. Phys., 74, 485, 2002). The purpose of this article is to review the origin and properties of the low-angle grain boundaries found in YBa 2 Cu 3 O 7−δ coated conductors both individually and as a collective system.

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“…For instance, Pennycook et al [8] observed by Z-contrast imaging that a CuO chain layer or CuO 2 layer was initially formed in the YBCO film prepared by laser ablation. Traeholt et al [9] found by high-resolution electron microscopy (HREM) that the initially formed atomic layer is always the CuO layer in YBCO film prepared by laser ablation or sputtering, no matter whether the interface is clean or an amorphous layer is present. Wu et al [10] reported that in YBCO films grown by liquid phase epitaxy (LPE) the initially formed atomic layer is the CuO layer or CuO 2 layer, while in films prepared by pulsed laser deposition (PLD) it might be a CuO, CuO 2 , or BaO layer followed by a CuO layer.…”

Section: Introductionmentioning

confidence: 99%

Forty-five degree oriented YBa₂Cu₃O₇₋_x/MgO interface structures studied by high-resolution electron microscopy

Wan

Cai

Wang

et al. 2008

Philosophical Magazine Letters

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Films of YBa 2 Cu 3 O 7Àx (YBCO) grown on (001) MgO substrates by liquid phase epitaxy in an oxygen atmosphere were investigated by high-resolution electron microscopy. The in-plane orientation of the films with respect to the substrates was [110] YBCO //[100] MgO . Two kinds of interface structures were observed from high-resolution electron microscope images. It was determined that in one kind of interface structure the initially formed layer of YBCO on MgO is the CuO layer, while in the other it is the BaO layer followed by a CuO layer. In the latter case, a thin layer of Cu 2 O is first formed on MgO as a linkage between YBCO and MgO.

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HREM study of the YBCO/MgO interface on an atomic scale

Cited by 20 publications

References 18 publications

Atomic interface sequence, misfit strain relaxation and intrinsic flux-pinning defects in different YBa₂Cu₃O_7−δheterogeneous systems

Atomic interface sequence, misfit strain relaxation and intrinsic flux-pinning defects in different YBa₂Cu₃O_7−δheterogeneous systems

Importance of low-angle grain boundaries in YBa₂Cu₃O_7−δcoated conductors

Forty-five degree oriented YBa₂Cu₃O₇₋_x/MgO interface structures studied by high-resolution electron microscopy

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HREM study of the YBCO/MgO interface on an atomic scale

Cited by 20 publications

References 18 publications

Atomic interface sequence, misfit strain relaxation and intrinsic flux-pinning defects in different YBa2Cu3O7−δheterogeneous systems

Atomic interface sequence, misfit strain relaxation and intrinsic flux-pinning defects in different YBa2Cu3O7−δheterogeneous systems

Importance of low-angle grain boundaries in YBa2Cu3O7−δcoated conductors

Forty-five degree oriented YBa2Cu3O7−x/MgO interface structures studied by high-resolution electron microscopy

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Atomic interface sequence, misfit strain relaxation and intrinsic flux-pinning defects in different YBa₂Cu₃O_7−δheterogeneous systems

Atomic interface sequence, misfit strain relaxation and intrinsic flux-pinning defects in different YBa₂Cu₃O_7−δheterogeneous systems

Importance of low-angle grain boundaries in YBa₂Cu₃O_7−δcoated conductors

Forty-five degree oriented YBa₂Cu₃O₇₋_x/MgO interface structures studied by high-resolution electron microscopy