Optimal annealing conditions for Y1Ba2Cu3O7−δ thin films

Mori, Zon; Doi, Toshiya; Hakuraku, Yoshinori

doi:10.1063/1.3276159

Cited by 7 publications

(3 citation statements)

References 10 publications

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“…It is well known that T c has a dome-like dependence on the hole concentration; that is, T c decreases in the case of overdoping. On the other hand, I c continues to increase even in overdoped REBCO film [25,26]. Therefore, it is not easy to infer the strain dependence of I c from that of T c .…”

Section: The Strain Dependence Of I C With Consideration Of Internal ...mentioning

confidence: 99%

The effect of the 2D internal strain state on the critical current in GdBCO coated conductors

Sugano

Machiya

Oguro

et al. 2012

Supercond. Sci. Technol.

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A reversible effect of strain on the critical current (Ic) has been reported for REBa2Cu3O7−δ (REBCO) coated conductors. In this study, the strain sensitivity of Ic was compared for GdBCO coated conductors with different crystal orientations. Extremely small strain sensitivity was confirmed from tensile and bending tests at 77 K for a GdBCO film with the [110] direction parallel to the tape length (Gd-F), while a GdBCO film with the [100] or [010] direction parallel to the tape length (Gd-I) has much stronger strain dependence of Ic. To compare the strain sensitivity of Ic based on internal strain, the lattice strain was evaluated for a GdBCO film in a composite conductor by employing a diffraction technique using synchrotron radiation. The lattice strain was determined along both the a- and b-axes for the orthogonal domains that are generated by the twin structure of GdBCO film. A distinct difference in the 2D strain state that depended on the crystal orientation was revealed for the GdBCO coated conductors. In Gd-I, the lattice strains along the axial and lateral directions are tensile and compressive under tensile loading, respectively, that is, the 2D internal strain state is anisotropic. On the other hand, an almost isotropic 2D strain state was confirmed in Gd-F. In addition, the strain components along the crystal axes in Gd-F are much smaller than the axial strain components in Gd-I. This difference in the internal strain state is attributed to the difference in strain sensitivity between the GdBCO coated conductors with different crystal orientations. The contributions of the strain components along the a- and b-axes to Ic are discussed on the basis of the measured strain sensitivities and internal strains for two conductors.

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Section: The Strain Dependence Of I C With Consideration Of Internal ...mentioning

confidence: 99%

The effect of the 2D internal strain state on the critical current in GdBCO coated conductors

Sugano

Machiya

Oguro

et al. 2012

Supercond. Sci. Technol.

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“…We use annealing as a tool to systematically and selectively mobilize the smaller defects [18], which diffuse faster than larger ones. Annealing effects in YBCO have been extensively studied [19][20][21][22][23]. Recovery of the lattice by defect annihilation occurs if these defects can recombine within an [2]).…”

Section: Introductionmentioning

confidence: 99%

“…Annealing effects in YBCO have been extensively studied. [19][20][21][22][23] Recovery of the lattice by defect annihilation occurs if these defects can recombine within an effective diffusion range 𝑋 = 𝐷 𝑇 𝑡 ! , where D(T) is the temperature--dependent diffusion constant and ta the annealing time.…”

mentioning

confidence: 99%

Decoupling and tuning competing effects of different types of defects on flux creep in irradiated YBa₂Cu₃O_7−δcoated conductors

Eley

Leroux

Rupich

et al. 2016

Supercond. Sci. Technol.

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YBa2Cu3O7-δ coated conductors (CCs) have achieved high critical current densities (Jc) that can be further increased through the introduction of additional defects using particle irradiation. However, these gains are accompanied by increases in the flux creep rate, a manifestation of competition between the different types of defects. Here, we study this competition to better understand how to design pinning landscapes that simultaneously increase Jc and reduce creep. CCs grown by metal organic deposition show non--monotonic changes in the temperature--dependent creep rate, S(T). Notably, in low fields, there is a conspicuous dip to low S as the temperature (T) increases from 20 K to 65 K. Oxygen--, proton--, and Au--irradiation substantially increase S in this temperature range. Focusing on an oxygen--irradiated CC, we investigate the contribution of different types of irradiation-induced defects to the flux creep rate. Specifically, we study S(T) as we tune the relative density of point defects to larger defects by annealing both an as--grown and an irradiated CC in O2 at temperatures TA = 250°C to 600°C. We observe a steady decrease in S(T > 20 K) with increasing TA, unveiling the role of pre--existing nanoparticle precipitates in creating the dip in S(T) and point defects and clusters in increasing S at intermediate temperatures.

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Effect of annealing on HTS tapes with a cerium oxide layer inserted between the REBaCuO and silver layers

et al. 2021

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Optimal annealing conditions for Y1Ba2Cu3O7−δ thin films

Cited by 7 publications

References 10 publications

The effect of the 2D internal strain state on the critical current in GdBCO coated conductors

The effect of the 2D internal strain state on the critical current in GdBCO coated conductors

Decoupling and tuning competing effects of different types of defects on flux creep in irradiated YBa₂Cu₃O_7−δcoated conductors

Effect of annealing on HTS tapes with a cerium oxide layer inserted between the REBaCuO and silver layers

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Optimal annealing conditions for Y1Ba2Cu3O7−δ thin films

Cited by 7 publications

References 10 publications

The effect of the 2D internal strain state on the critical current in GdBCO coated conductors

The effect of the 2D internal strain state on the critical current in GdBCO coated conductors

Decoupling and tuning competing effects of different types of defects on flux creep in irradiated YBa2Cu3O7−δcoated conductors

Effect of annealing on HTS tapes with a cerium oxide layer inserted between the REBaCuO and silver layers

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Decoupling and tuning competing effects of different types of defects on flux creep in irradiated YBa₂Cu₃O_7−δcoated conductors