Structural and superconducting properties of Y1-2xPrxCaxBa2Cu3O7-?: high-Tc superconductors

Charoenthai, Nipaphat; Winotai, P.; Suryanarayanan, R.

doi:10.1002/pssa.200406832

Cited by 2 publications

(2 citation statements)

References 21 publications

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“…This is due to the fact that the ionic radius of Ca 2+ (1.14 Å) is much larger than that of Gd 3+ (1.02 Å). More important, it is found that the orthorhombic distortion D = (b − a)/(b + a) decreases monotonically with the increase of Pr and Ca concentration [21][22][23]. But the samples still retained the orthorhombic structure.…”

Section: X-ray Diffraction Analysismentioning

confidence: 94%

Structural changes and superconducting properties of Gd_1−2xPr_xCa_xBa₂Cu₃O_7−δHTSCs

Udomkan¹,

Winotai²,

Suryanarayanan³

et al. 2005

Supercond. Sci. Technol.

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We report on structural changes and the properties of Gd1−2xPrxCaxBa2Cu3O7−δ (0≤x≤0.3) high temperature superconductors which were prepared and characterized. The transition temperature (Tc) was found to decrease roughly linearly with respect to the Pr and Ca concentration x. 65Cu2+(3d9) and 63Cu2+(3d9) ions from impurity phase BaCuO2 give rise to X-band electron spin resonant (ESR) two-quartet absorption peaks centred at ∼310 mT (g∼2.020) which are superposed by the broad ESR peak of Gd3+(4f7) at g∼2.000 in the undoped Gd123. Both sets of ESR peaks shift towards low fields as the temperature is lowered, which is due to the change in crystal field experienced by the ions. It should be noted here that even at 77 K there still is no magnetic ordering from Gd3+ ions. However, at x = 0.025 doping, a new six-peak hyperfine multiplet ESR signal arising from 141Pr4+ (4f1,S = 1/2,I = 5/2) appears at ∼323 mT (g∼2.029). Typical simulated ESR parameters of Gd3+ in Gd1−2xPrxCaxBa2Cu3O7−δ at x = 0.025, are gx = 2.4879, gy = 2.3921 and gz = 2.2590, Axx = 12.50, Ayy = 23.50, Azz = 32.00 G and the zero-field splitting parameter (D) of 66.0 G, respectively. This signal arises from some Pr ions entering the Gd site with a valence of four, thus lending support to the hole-filling and pair-breaking models.

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Section: X-ray Diffraction Analysismentioning

confidence: 94%

Structural changes and superconducting properties of Gd_1−2xPr_xCa_xBa₂Cu₃O_7−δHTSCs

Udomkan¹,

Winotai²,

Suryanarayanan³

et al. 2005

Supercond. Sci. Technol.

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“…tantly, it is found that the orthorhombic distortion D = (b − a)/(b + a) decreases monotonically with the increase of Pr and Ca concentration [22][23][24]. But the samples still retained the orthorhombic structure.…”

mentioning

confidence: 94%

EFFECT OF Pr AND Ca DOPING ON THE SUPERCONDUCTING PROPERTIES OF Dy_1-2xPr_xCa_xBa₂Cu₃O_7-δ HTSCs

Charoenthai

Udomkan

2007

Int. J. Mod. Phys. B

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The structure changes and the suppression of superconductivity in the Dy-123 hightemperature superconductors (HTSCs) due to equal substitution of Pr and Ca are studied. The onset temperatures (Tc's) of the co-doped Dy 1−2x PrxCaxBa 2 Cu 3 O 7−δ HTSC's are measured by AC susceptibility measurements. The Tc 's and rates of decrease of dTc/dx due to Pr substitution for both series exhibit rare earth size effects. It is found that the lattice distortion defined by D = (b − a)/(b + a), where a and b are the lattice parameters in the basal plane, decreases systematically as the doping is increased. A hole-filling and pair-breaking model is used to explain the behaviors of both the Tc's and the rates of decrease of dTc/dx as Pr 4+ ions are doped into two "123" HTSCs.

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Structural and superconducting properties of Y1-2xPrxCaxBa2Cu3O7-?: high-Tc superconductors

Cited by 2 publications

References 21 publications

Structural changes and superconducting properties of Gd_1−2xPr_xCa_xBa₂Cu₃O_7−δHTSCs

Structural changes and superconducting properties of Gd_1−2xPr_xCa_xBa₂Cu₃O_7−δHTSCs

EFFECT OF Pr AND Ca DOPING ON THE SUPERCONDUCTING PROPERTIES OF Dy_1-2xPr_xCa_xBa₂Cu₃O_7-δ HTSCs

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Structural and superconducting properties of Y1-2xPrxCaxBa2Cu3O7-?: high-Tc superconductors

Cited by 2 publications

References 21 publications

Structural changes and superconducting properties of Gd1−2xPrxCaxBa2Cu3O7−δHTSCs

Structural changes and superconducting properties of Gd1−2xPrxCaxBa2Cu3O7−δHTSCs

EFFECT OF Pr AND Ca DOPING ON THE SUPERCONDUCTING PROPERTIES OF Dy1-2xPrxCaxBa2Cu3O7-δ HTSCs

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Structural changes and superconducting properties of Gd_1−2xPr_xCa_xBa₂Cu₃O_7−δHTSCs

Structural changes and superconducting properties of Gd_1−2xPr_xCa_xBa₂Cu₃O_7−δHTSCs

EFFECT OF Pr AND Ca DOPING ON THE SUPERCONDUCTING PROPERTIES OF Dy_1-2xPr_xCa_xBa₂Cu₃O_7-δ HTSCs