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Bridges, F.; Li, Guoguang; Boyce, J. B.; Claeson, T.

doi:10.1103/physrevb.48.1266

Cited by 35 publications

(12 citation statements)

References 60 publications

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“…The diamagnetic onset temperatures (T c ) of the superconducting transition are listed in Table 1. We note that transition temperature decreases as the amount of Zn doping increases, as reported by some other researchers, see for example [1,4,7,12,14,15]. Figure 5 shows the schematic of the Vickers indenter and its indentation impression.…”

Section: Resultsmentioning

confidence: 52%

“…Many studies indicate that Zn substitutes on the Cu(2) site but many of the arguments are indirect, i.e., based on the assumption that a depression of T c must be connected to the disturbances of the conducting CuO 2 planes [15], see references therein. The calculations of Zhang et al [2] show that Zn 2+ has the lowest solution energy at the Cu(2) site indicating that the Zn 2+ cation energetically prefers to substitute at Cu(2) site.…”

Section: Resultsmentioning

confidence: 99%

“…There have been many papers reporting the effect of Zn doping on the YBCO compound [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] to probe the physical properties of the Cu-O 2 plane. A decrease in transition temperature with increasing Zn content in YBCO system was observed by some workers [1,4,7,12,14,15]. Zhang et al [2,3] found that Zn dopant is energetically favourable to substitute at the Cu(2) site.…”

Section: Introductionmentioning

confidence: 99%

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Superconducting and Vickers hardness properties of ZnO‐added YBCO polycrystalline superconductors

Kölemen

Çelebi

Karal

et al. 2004

Physica Status Solidi (b)

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The effects of ZnO addition on the microstructure and mechanical properties of the YBCO have been investigated through XRD, SEM, EDX, ac susceptibility measurements and the standard Vickers microhardness testing method. We have prepared the samples by a conventional solid-state reaction method and used an additive method for the YBCO system (0, 0.5 and 1 wt% of ZnO). The orthorhombic strain ∆ = (b -a)/(b + a) increases as the Zn content increases, where a and b are the relevant lattice parameters of the samples. The superconducting transition temperatures and hardness depend on the Zn content of the samples. The hardness is found to be load dependent. From the relation between applied load F and the square of the impression diagonal, d 2 , the true hardness, H 0 , and the dissipative portion of the indentation load F 0 , were derived from the slope and the intercept (at d 2 = 0) of the straight line, respectively. The hardness was increased while the transition temperature decreased with the amount of ZnO addition to YBCO.

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Section: Resultsmentioning

confidence: 52%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Superconducting and Vickers hardness properties of ZnO‐added YBCO polycrystalline superconductors

Kölemen

Çelebi

Karal

et al. 2004

Physica Status Solidi (b)

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show abstract

“…We note that transition temperature decreases as the amount of Zn doping increases, as reported by some other workers, see for example Refs. [18,21,26,28,29].…”

Section: Methodsmentioning

confidence: 99%

“…Decrease in transition temperature with increasing Zn content in YBCO system was presented by some authors [18,21,26,28,29]. Zhang et al [17] found that Zn dopant is energetically favourable to substitute at the Cu(2) site.…”

Section: Introductionmentioning

confidence: 99%

Effect of ZnO Additions on the Magnetic Behaviour in YBCO Superconductors

Çelebi

Kölemen

Malik

et al. 2002

phys. stat. sol. (a)

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We have investigated the effect of ZnO additions on YBCO prepared by conventional solid state reaction method by ac susceptibility measurements. We measured the ac susceptibility of sintered YBCO pellets as a function of temperature and ac magnetic field amplitude. The superconducting transition temperatures and critical current density depend on the Zn content of the samples. The intergrain critical current density was increased significantly by 1 wt% of ZnO compared to that of undoped samples. This conclusion was drawn by various aspects. The values of the extrapolated jcm(0) are 160, 308 and 1000 A/cm2 for samples S1, S2, and S3 respectively. We also qualitatively discuss experimental results in the framework of the Bean critical state model, estimate the effective volume fraction of the grains and determine the temperature dependence of the critical current density by means of the best fit of the calculated data for the experimental matrix susceptibility.

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Calculation of Zn-doped Y ceramics by the electron-correlated embedded-cluster method

Kaplan¹,

Soullard

2000

Int. J. Quantum Chem.

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An approach, where the embedded‐cluster method (ECM) is applied in the frame of the Gaussian program to calculate the local electronic structure of crystals at the electron correlation level is presented. This approach is applied to a ground‐state electronic structure calculation of the pure and Zn‐doped Y123 ceramics at the second‐order Møller–Plesset (MP2) correlation level (the ECM‐MP2 approach). This allows to study the influence of the Zn doping on the charge distribution and the hole symmetry on the Cu and O ions obtained in the natural bond orbital (NBO) population analysis at the MP2 level. The possible mechanisms of the degradation of superconductivity in the Zn‐doped Y ceramics are discussed. © 2000 John Wiley & Sons, Inc. Int J Quant Chem 80: 320–326, 2000

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Distorted local environment around Zn on Cu(2) sites inYBa2Cu3<

Cited by 35 publications

References 60 publications

Superconducting and Vickers hardness properties of ZnO‐added YBCO polycrystalline superconductors

Superconducting and Vickers hardness properties of ZnO‐added YBCO polycrystalline superconductors

Effect of ZnO Additions on the Magnetic Behaviour in YBCO Superconductors

Calculation of Zn-doped Y ceramics by the electron-correlated embedded-cluster method

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