Internal charge transfer in tetragonal superconductor (CaxLa1−x)(Ba1.75−xLa0.25+x) Cu3Oy

Goldschmidt, D.; Reisner, G. M.; Direktovich, Y; Knizhnik, A.; Gartstein, E.; Kimmel, G.; Eckstein, Y.

doi:10.1016/0921-4534(93)90815-8

Cited by 12 publications

(3 citation statements)

References 7 publications

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“…We selected two samples from the resistivity measurements, the x = 0.05 sample (superconductor) and the x = 0.3 sample (semiconductor), in order to study the excess conductivity σ/σ 0 for the superconductor sample and the variable-range hopping (VRH) between localized states for the semiconductor sample. The excess conductivity is related to the reduced temperature t according the relation [16] σ/σ 0 = At n (1) where n is the critical exponent, which is equal to −1 for two-dimensional (2D) fluctuation and equal −0.5 for…”

Section: Resultsmentioning

confidence: 99%

“…The replacement must be between ions of equivalent size. There is a critical solubility limit to the doped system otherwise impurities start to form [1]. Substitution of divalent Ca for trivalent Y in the Y-123 system generates additional holes in the Cu (2) O planes.…”

Section: Introductionmentioning

confidence: 99%

“…So that this substitution may induce superconductivity in an otherwise semiconducting YBa 2 Cu 3 O 6 [2]. Also, it introduces oxygen vacancies in Cu (1) O chains, which partially offsets the hole doping effect. On the other hand, replacement of divalent Ba by trivalent rare earth ions reduces T c and increases the oxygen content [3].…”

Section: Introductionmentioning

confidence: 99%

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Study of the localization and Cooper pair breaking in Tl_1-xEr_xBa₂Ca₂Cu₃O_9-δ

Abou‐Aly¹,

Mohammed²,

Awad³

et al. 2000

Supercond. Sci. Technol.

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A series of high-temperature superconductors of type Tl 1−x Er x Ba 2 Ca 2 Cu 3 O 9−δ with x ranging from 0 to 0.3 are prepared at 860 • C for 3.5 h. The x-ray diffraction, scanning electron microscopy and electrical resistivity measurements for the prepared samples are reported. The x-ray data indicate that the replacement of the Tl 3+ ions by the magnetic Er 3+ ions does not change the structure until x = 0.3 and the solubility limit is found to be around x s = 0.2. The transition temperature T c , determined from electrical resistivity data, show a depression in its value by increasing the Er content.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%